79 results found.
... on the Bozenkill, New York State] Comments from reviews: ". .. enough terrestrial intrigue to keep us thinking for years", Pursuit. View Cart Buy online via PayPal with MC/Visa/Amex 245 pages, hardcover, $17.95, 84 illustrations, 5 indexes 1988, 682 references, LC 87-63408, ISBN 915554-22-4 , 7x10 format. Anomalies in Geology: Physical, Chemical, Biological; A Catalog of Geological Anomalies Sorry: Out of Print. No longer available. Journey here into ice caves, exhume Siberian mammoths, see animals perish in gas-filled valleys -- a little media hype is justified here. But more serious questions involve the origins of oil, coal, and natural gas. Typical subjects covered: Biological extinction events * Musical sands, ringing rocks * Anomalies of oil's origin * Ice caves, frozen wells * Natural fission reactors * Marine organisms and fossils found far inland * Siberia's frozen mammoths * Radiometric dating problems * Anchor ice, frazil ice * Violent lake turnovers * Flexible rocks * Origin of ocean water * Skipping in fossil record * Valleys of death * Prismatic sandstone from Missouri 335 pages, hardcover, $18.95, 55 illustrations, 5 indexes 1989. 1260 references, LC 89-90680, ISBN 915554-23-2 , 7x10 format. Neglected Geological Anomalies: A Catalog of Geological Anomalies Sorry: Out of Print. No longer available. Neglected but far from insignificant are the anomalies cataloged here. Do we really know how concretions and geodes form, ...
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... the earth: the bone caves, the Siberian mammoth carcasses, the masses of fresh moa bones in Australia, and host of other geological and biological puzzles. Most of Howorth's attention, however, is focussed on the mammoths and their recent demise. This book is one of the classics of catastrophe literature. Evolutionary Geology and the New Catastrophism View Cart Buy online via PayPal with MC/Visa/Amex G.M . Price. 1926, 352 pp., $19.95p Price was an early catastrophist at a time when uniformitarianism ruled with an iron fist. He systematically and rationally presented some of geology's major anomalies -- particularly in stratigraphy. Chapter titles include: The Modern Onion-Coat Theory; • "Deceptive Conformity"; • Upside Down; • Extinct Species; • Skipping; • Graveyards; • Degeneration; • Fossil Men. Price was a creationist, but his book is devoid of theology. The Aerial World View Cart Buy online via PayPal with MC/Visa/Amex G. Hartwig 1886, 560 pp., $26.95p Iven though this title is over a century old, it is still a pleasure to read. Its 37 chapters touch on just about every facet of weather and geophysics known: • The echo; • Waterspouts; • The Rainbow; • The thunderstorm; • St. Elmo's fire; and even flying machines, such as they were in 1886! There are hundreds of anecdotes and descriptions of curious phenomena, such as: • Remarkable echoes in Siberia; • Luminous dust; • ...
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... existence of Mirror-Matter neutrinos spinning the other way would redress things, making the universe "perfect" -- at least as far as human aesthetics are concerned. (Other entities might yearn for asymmetry, who knows?) Anyway, Mirror Matter is defined as being palpable and could also be that "missing mass" or "dark matter" that astronomers need to explain why spinning galaxies do not fly apart. Mirror Matter could also account for some mysterious terrestrial phenomena such as that unaccountable lack of a significant crater in Siberia, where the 1908 Tunguska blast leveled a huge forest but hardly disturbed the ground. Recently, Mirror Matter has been invoked to explain the ups and downs of terrestrial biodiversity. R. Foot and Z. Silagadze propose that the 26-millionyear periodicity in terrestrial extinctions -- claimed to be present in the fossil record -- is due to a solar-system planet made of Mirror Matter (and therefore invisible). This postulated planet has a period of 26-million years and regularly gravitationally jostles the Oort Cloud of comets on the periphery of the solar system. These jolts unleash torrents of devastating comets upon the inner solar system every 26-million years, thereby blasting the earth and its sensitive biological cargo. This supposed Mirror-Matter planet happens to be the conceptual double of a Normal-Matter, hypothetical planet named Nemesis, which was proposed in the 1980s to account for the same periodical extinctions in the fossil record. However, diligent searches did not locate Nemesis. Of course, if Nemesis were made of Mirror Matter, as now ...
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... Science Frontiers ONLINE No. 136: JUL-AUG 2001 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects 2000 CR105 and Planet X 2000 CR105 is a supercomet some 400 kilometers in diameter. It is one of hundreds of icy TNOs (Trans-Neptunian Objects) that normally populate the Kuiper Belt girdling the solar system just beyond the orbit of Neptune. The problem is that 2000 CR105 is not normal. Its orbit is highly eccentric, with an aphelion 13 times farther out than Neptune's . This massive object (probably mostly ice) takes 3175 years to circle the sun. 2000 CR105 is real; it has been photographed; it is not Mirror Matter; no one blames any terrestrial extinctions on it. Nevertheless, we can and must wonder how its orbit became so badly distorted. Often in past years, whenever astronomers detected cometary orbits gone awry, they invoked Planet X; that is, some undiscovered massive body plying the outer reaches of the solar system. Indeed, there have been several intense and unsuccessful searches for Planet X over the years. (See Chapter AX in The Sun and Solar System Debris.) History seems to be repeating itself with 2000 CR105. Astronomer B. Gladman proposes that 2000 CR105 was forced into its present eccentric orbit by an encounter with a Mars-size Planet X that now orbits the sun at a distance about 15 times that of Neptune. From the standpoint of celestial mechanics, this perturbation of 2000 CR105's orbit is certainly within the realm of possibility. But two associated ...
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... the impact splashed droplets of molten rock into the atmosphere, where they were shaped aerodynamically and then fell as tektites. The extent of the immense Australasian-tektite strewn field implies a hard-to-miss crater about 100 kilometers in diameter. Yet, despite the geological recency of the event and despite much geological surveying, no convincing crater has been discovered. (SF#115) So, we have abundant evidence of a terrestrial event encompassing much of the planet but no "smoking crater"! The mystery deepens when one realizes that whatever cataclysm sent the Australian tektites aloft may have been comparable in magnitude to the impact that extinguished the dinosaurs (and other fauna) some 65 million years ago. This much older event has its craterburied below the Yucatan and is further marked by widespread biological extinctions. In contrast, the Australasian-tektite event is not only minus an obvious crater but seems to have had scant effect on the earth's cargo of sensitive life forms. It was a strangely "gentle" event despite the rocky deluge of tektites. What really happened? (Paine, Michael; "Source of the Australasian Tektites," Meteorite, p. 24, February 2001. Varricchio, Louis; "Tektite Origins," Meteorite, p. 4, May 2001.) Comment. Was the Australasian-tektite event an encounter with mirror matter, perhaps like Tunguska might have been? We would be derelict not to mention here the claim by J.A . O'Keefe and others that the rain of Australasian tektites originated in an impact event that occurred not ...
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... anomalous dates. Some North American dates may in consequence be as much as 10,000 years too young. So, we are not dealing with a trivial phenomenon! Supporting evidence. Four main categories of supporting evidence are claimed and presented in varying degrees of detail. Anomalously young radiocarbon dates in north-central North America. Example: the Gainey site in Michigan. Physical evidence of particle bombardment. Example: chert artifacts with high densities of particle-entrance wounds. Anomalous uranium and plutonium abundance ratios in the affected area. Tree-ring and marine sediment data. The authors claim that the burst of radiation from a nearby supernova, circa 12,500 years ago, not only reset radiocarbon clocks but also heated the planet's atmosphere, melted ice sheets, and led to biological extinctions. If verified, the claimed phenomenon would also "reset" archeological models of the settlement of North and South America. To illustrate, we may have to add as many as 10,000 years to site dates in much of North America! (Firestone, Richard B., and Topping, William; "Terrestrial Evidence of a Nuclear Catastrophe in Paleoindian Times," The Mammoth Trumpet, 16:9 , March 2001. Cr. C. Davant III. This off-mainstream journal is published by the Center for the Study of the First Americans, 355 Weniger Hall, Oregon State University, Corvallis, OR 97331-6510.) Comment. Thus we add another potential cause of an often-hypothesized, 12,500-BP catastrophe that is said to have changed ...
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... tractor one," and it had a definite torus shape. What made the dark object an even stranger sight was a considerable number of "Xmas candies", all hanging down from its underside 15 to 20 centimetres long and "sparkling", which means changing brightness with an emission of sparks at the same time. A humming and sizzling sound was associated with the optical effect, but there was no static electricity. The strange light was not blinding, but irritated the eyes of the witness who looked at it only intermittently. Mrs. Reisinger continued her work in the shed, not moving closer to the object and getting more nervous over the 10 minutes that the phenomenon lasted. Her eyes started to water towards the end of the observation. Another phenomenon that she remembers was the irregular extinction of the "candies" which went out piece by piece. (Keul, Alexander G.; "More on a Torus Ball-Lightning Case," Journal of Meterology, U.K ., 25:49, 2000. The initial report was presented in the same journal, 24:178, 1999.) Comment. The buzzing sound remarked upon above leads us to the even weirder phenomenon recorded below. From Science Frontiers #132, NOV-DEC 2000 . 2000 William R. Corliss Other Sites of Interest SIS . Catastrophism, archaeoastronomy, ancient history, mythology and astronomy. Lobster . The journal of intelligence and political conspiracy (CIA, FBI, JFK, MI5, NSA, etc) Homeworking.com . Free resource for people thinking about working at home. ...
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... on a geological time scale, of course! What could have perturbed the earth? One suggestion blames a sudden shifting of the planet's mass distribution, some sort of subterranean indigestion, like a subducted ocean plate suddenly plunging through into the lower mantle. (Kerr, Richard A.; "Did the Dinosaurs Live on a Topsy-Turvy Earth?" Science, 287:406, 2000.) The biological consequences of such a sudden tilting could have been severe. The event -- known as rapid true polar wander -- may have been accompanied by worldwide volcanic upheavals and reorganization of tectonic plates that would have played havoc with anything living in the Late Cretaceous period, 65 million to 99 million years ago. Although the notion that an asteroid was the immediate cause of dinosaur extinction about 65 million years ago has won wide acceptance, many paleontologists have argued that volcanic activity may have played a role in changing the climate and sending populations of the giant creatures into decline. (Bowman, Lee; "Scientist's Say Earth's Magnetic Field Shifted Rapidly in Time of Dinosaurs," Dallas Morning News, January 21, 2000. Cr. Phelps) Comment. Coincidentally (honest!), we are offering with this mailing a reprint of C.H . Hapgood's The Path of the Pole. From Science Frontiers #128, MAR-APR 2000 . 1997 William R. Corliss Other Sites of Interest SIS . Catastrophism, archaeoastronomy, ancient history, mythology and astronomy. Lobster . The journal of intelligence and political conspiracy (CIA, FBI, ...
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... Science Frontiers ONLINE No. 87: May-Jun 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Whence the earth's pulse?Geological history records a restless planet subject to a succession of chemical and physical upheavals. Have these great paroxysms been random in time? M.R . Rampino and K. Caldeira do not think so: Number of geological events during geologic time "Published data sets of major geologic events of the past 250 Myr (extinction events, sea-level lows, continental flood-basalt eruptions, mountain-building events, abrupt changes in sea-floor spreading, ocean-anoxic and blackshale events and the largest evaporite deposits) have been synthesized (with estimated errors). These events show evidence for a statistically significant periodic component with an underlying periodicity, formally equal to 26.6 Myr, and a recent maximum, close to the present time. The cycle may not be strictly periodic, but a periodicity of 30 Myr is robust to probable errors in dating of the geologic events." The obvious question is: What could cause a 30-million-year periodicity? Internally, the earth's innards might be periodic, possibly in terms of plume eruption, mineral phase changes, core convection, etc. Externally, comets and asteroids are cyclic. Rampino and Caldeira point out that the solar system crosses the heavily populated plane of the Galaxy every 30 million years. (Rampino, Michael R., and Caldeira, Ken; "Major Episodes of Geologic Change: Correlations, Time ...
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... Science Frontiers ONLINE No. 85: Jan-Feb 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Three Views Of Mortality The death of matter. Physicists have maintained for over a century that the Second Law of Thermodynamics guarantees that our universe with run down one day and that life must cease. This cold reductionist view is seconded by recent evidence that protons, long con sidered immortal, may after all decay. The consequences of proton decay are even more dismal than the dire predictions of thermodynamics: "Perhaps the most disturbing piece of speculation to come out of theoretical physics recently is the prediction that the whole universe is in decay. Not only do living things die, species go extinct, and stars burn out, but the apparently immutable protons in the nucleus of every atom are slowly dissolving. Eventually -- in more than a quadrillion years -- nothing will be left of the universe but a dead mist of electrons, photons, and neutrinos." (Flam, Faye; "Could Protons Be Mortal after All?" Science, 257:1862, 1992.) The death of memory. With increasing entropy and decaying protons on their minds, it comes as no surprise that physicists likewise believe that when one dies, that's it . An afterlife is impossible. How do physicists conclude this? In a letter to the American Journal of Physics, J. Orear proffered an interesting sort of "proof": "One such proof: human memory is stored in the circuitry of the brain and after death ...
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... an Indian mound at Round Rock. This mound is dated at approximately 800 AD. Skeptics suppose that the coin was dropped on top of the mound in recent times and was carried to the bottom by rodents and tree roots. Hmmm! The remains of a shipwreck . Circa 1886, the wreck of an unusual ship was found in Galveston Bay. Belfiglio says this ship's construction is typically Roman. Nautical experts doubt this. but they will admit that real Roman craft were perfectly capable of sailing to Texas. The remains of an ancient bridge . Also in Galveston Bay, the timbers of an old bridge were found under 15 feet of sediment. A similar divergence of opinion prevails here. Language concordances . Belfiglio has pointed out many similarities between Latin and a dialect of the now-extinct Karankawas tribe. No comment here from the language experts. (Lee, Victoria; "Professor Explores Theory of Romans' Ancient Voyage," Dallas Morning News, June 13, 1993. Cr. T. Adams via L. Farish.) From Science Frontiers #90, NOV-DEC 1993 . 1993-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 69: May-Jun 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Extinction Discounted "A computer analysis has left little doubt that the supposedly extinct Tasmanian tiger or wolf still exists in remote areas of Australia's island state." The thylacine (or Tasmanian wolf or tiger) has been reported repeatedly in recently years. The last captive specimen of the marsupial tiger or thylacine died in a Tasmanian zoo in 1936. No living specimen has been verified since, but sporadic reports persist in Tasmania, Victoria, and Western Australia. H. Nix, of the Australian National University's Centre for Resource and Environmental Studies, has a computer program based upon detailed descriptions of climatic, topographic, and environmental factors that identifies areas where a particular animal or plant could flourish. Nix gathered the environmen tal requirements of the thylacine from records of where they had been shot and trapped in the past. This plus the computer program allowed Nix to identify prime thylacine territory. Compar-ing this information with the best sightings over the past 60 years, Nix found perfect agreement. In other words, post-extinction reports of thylacines come from just those areas where one would expect them to! (Anonymous; "Computers Help to Hunt the Tasmanian Tiger," New Scientist, p. 24, March 10, 1990.) Comment. This all sounds a bit tauto logical; that is, like "circular reasoning"! Reference. The possible late survival of the thylacine is covered in BMD12 in our ...
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... Science Frontiers ONLINE No. 69: May-Jun 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Extinction Countdown Some plants may, as described below, have environment-sensitive genes that help them adjust to external pressures. Amphibians and birds do not seem to be so pliable. The worldwide precipitous decline of amphibian populations is alarming. Her-petologists are literally seeing species disappear before their eyes. Here is a typical anecdote: "In 1974, Michael Tyler of the University of Adelaide, Australia, described a newly discovered frog species that broods its young in its stomach. The frog was once so commo 'an agile collector could have picked up 100 in a single night,' Tyler says. By 1980 it had completely disappeared from its habitat (a 100-square-kilometer area in the Conondale Ranges, 100 miles north of Brisbane). It has not been seen since." Similar stories emanate from Brazil, Japan, Mexico, Norway, and elsewhere. Many environmental causes have been proposed, but it is significant that the frogs are also disappearing from nature preserves where environmental pressures are small. D. Wake, a biologist at Berkeley, has remarked: "[ Amphibians] were here when the dinosaurs were here, and [they] survived the age of mammals. If they're checking out now, I think it is significant." In this context, Wake believes that there is a single, global, still-unidentified cause operating. (Barinaga, Marcia; "Where Have All the ...
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... Science Frontiers ONLINE No. 69: May-Jun 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Spontaneous order, evolution, and life In our thinking, one of the most remarkable articles ever to appear in Science bears the above title. Most re markable of all is the use of the word "spontaneous" without philosophical comment. The stimuli for the research described are such observations as: (1 ) life exists; (2 ) life evolves; (3 ) the fossil record displays stasis, extinctions, and great gaps between phyla and lesser classifications; and (4 ) disordered molecules move smoothly and surely into the order manifest in the living cell. The question asked in the article is whether science has missed something in its description of the origin and development of life. Just what makes molecules coalesce into cells and humans? The answer given is: spontaneous self-organization ! In other words, there is no guiding external force. Molecules do this spontaneously. There are even computer models being developed, based on a branch of mathematics called "dynamical systems," that describe how this all happens - spontaneously, of course. (Waldrop, M. Mitchell; "Spontaneous Order, Evolution, and Life," Science, 247:1543, 1990.) Comment. When water molecules spontaneously cluster together to form a snowflake, with all its symmetry and order, science explains the process in terms of the properties of water molecules. The same must be true when molecules merge to form life forms. But ...
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... has led to the widely accepted notion that an extraterrestrial projectile slammed into the earth at that time, wreaking geological and biological havoc. But the K-T boundary is anything but simple chemically and paleontologically. To illustrate, J.L . Bada and M. Zhao have found unusual amino acids in sediments laid down before and after this geological time marker. "They find that Danish sediments spanning the narrow boundary layer contain two amino acids, alpha-aminoisobutyric acid and isovaline, that are relatively uncommon in biological materials but abundant in the organicrich meteorites. They suggest that the body which collided with Earth 65 million years ago and left the telltale iridium residue may have been organic-rich, perhaps like a C-type asteroid or a comet. Such a possibility has interesting implications for the extinction and related atmospheric effects, and supports the idea that impact events could have supplied the Earth during a much earlier period with the raw materials for organic chemical evolution." Actually, the above quotation is pretty much in line with present mainstream thinking. Perhaps so, but Bada and Zhao identified two troubling anomalies. First, the amounts of amino acids found were surprisingly high. How could these complex molecules survive the searing temperatures engendered by high-velocity impact? Second, the amino acids may be abundant tens of centimeters above and below the K-T boundary clay containing the iridium, but they are virtually absent in the clay itself! (Cronin, John R.; "Amino Acids and Bolide Impacts," Nature, 339:423, 1989, Also: Monastersky, R ...
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... a bulldozer, compressing the lunar magnetic fields ahead of it, as it envelopes the whole moon and rushes towards the antipodal point. It drives the compressed mag netic field into the surface, permanently magnetizing the rocks at the antipodal point. Voila! Magcons. (Hood, L.L ., and Huang, Z.; "Formation of Magnetic Anomalies Antipodal to Lunar Impact Basins: Two-Dimensional Model Calculations," Journal of Geophysical Research, 96:9837, 1991.) Comment. The earth also sports scars from the impacts of large meteoroids. Are there magnetic anomalies opposite these craters? Even more interesting to check out would be the holes blasted in the earth's biosphere by the converging masses of hot gases at the an tipodal points. Wouldn't there be extinctions seen in the fossil record at these antipodal points? Reference. Magcons are cataloged as ALZ1 in The Moon and Planets. This catalog is described here . From Science Frontiers #78, NOV-DEC 1991 . 1991-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 77: Sep-Oct 1991 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Cooler heads, bigger brains?When anthropologist D. Falk discovered that an automobile's engine was limited in power by its radiator's capacity to cool it, he applied this thinking to the human brain. The human brain, like the automobile engine, must be kept cool if it is to function well. It follows that if the brain of an animal is not functioning well, the body that brain controls will not perform well either. Overheated brains, then, are sure roads to extinction in the highly competitive natural world. A couple million years ago, two groups of human precursors were competing for dominance in Africa. The group that won and subsequently evolved into Homo sapiens had, according to Falk, a better brain-cooling system. The evolutionary development that probably led to this advantage was a more extensive network of emissary veins, which permitted better dissipation of heat. This, in turn, allowed the evolution of larger brains and dominance by Homo sapiens. Other anthropologists, how ever doubt that such a minor change in the circulatory system could account for the emergence of modern man. (Shipman, Pat; "Hotheads," Discover, 12:18, April 1991.) Comment. What an intriguing concept! Perhaps human male baldness also confers more cooling efficiency and is setting the stage for a new expansion of the human brain -- at least the male brain, sorry girls! More seriously ...
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... years ago as the Ice Ages waned. This date is another of those "consensus" scientific facts that no one dares challenge if he or she wishes to get published or win research grants. Although this subject remains "closed off" in normal scientific intercourse, there remain tantalizing hints that elephants roamed the Americas until very recently - perhaps even a few hundred years ago! The following snippets are culled from two articles written by G. Carter, Texas A&M , now emeritus, but always heretical: Numerous folk memories of the elephamt were retained by American Indians. A mastadon was killed, cooked, and eaten by humans in Ecuador circa 1500 BC. Indians told Thomas Jefferson that elephants could still be seen in the region of the Great Lakes. In Florida, a cache of extinct animals, including elephants, was carbon-dated at 2000 BP. Elephant heads are prominent in art and sculpture from Mexico, Central American, and northern South America. (Carter, George F.; "A Note on the Elephant in America," and "The Mammoth in American Epigraphy," Epigraphic Society, Occasional Publications, 18:90 and 18:213, 1989.) Reference. The evidence for the recent survival of the mammoth is presented in BMD10 in our catalog: Biological Anomalies: Mammals II. Details here . From Science Frontiers #68, MAR-APR 1990 . 1990-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 60: Nov-Dec 1988 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Collision/eruption/extinction/ magnetic reversal An increasingly popular scenario is: (1 ) Every 34 million years the solar system bobs up and down through the thickly populated disk of our galaxy; (2 ) The resulting encounters lead to showers of comets and/or asteroids on earth; (3 ) The mechanic trauma leads to basalt flooding; (4 ) Great biological extinctions occur in consequence; and (5 ) The terrestrial magnetic field reverses in step. Now, if scientists could show that all of these phenomena occur at the same frequency and are roughly in phase, it would constitute one of science's most important syntheses. The stratigraphic record and the estimated ages of meteor craters certainly hint at such synchrony. Recently, two more papers have appeared which support the above scenario. First, M.R . Rampino and R.B . Stothers show that during the past 250 million years, eleven episodes of basalt flooding have occurred with an average cycle time of 32 million years. Second, J. Negi maintains that the earth's magnetic record boasts a similar string of disturbances, with an average period of 33 million years. (Anonymous; "Regular Reversals in Earth's Magnetic Field A Fluke?" New Scientist, p. 32, August 25, 1988.) From Science Frontiers #60, NOV-DEC 1988 . 1988-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 54: Nov-Dec 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Now, it's comet showers that did it The impact/extinction controvery still rages. A careful evaluation of paleontological evidence has persuaded catas trophists to think in terms of comet showers spread out over a few million years, rather than a single impact per extinction. This short abstract from a Nature article says it all: "If at least some mass extinctions are caused by impacts, why do they extend over intervals of one to three million years and have a partly stepwise character? The solution may be provided by multiple cometary impacts. Astronomical, geological and palaeontological evidence is consistent with a causal connection between comet showers, clusters of impact events and stepwise mass exi tinctions, but it is too early to tell how pervasive this relationship may be." (Hut, Piet, et al; "Comet Showers as a Cause of Mass Extinctions," Nature, 329:118, 1987.) Comment. In other words, the nature of astronomical catastrophism is still up in the air! But, bear in mind that a mere decade ago such a paper would have to look far for a jounal that would publish it. From Science Frontiers #54, NOV-DEC 1987 . 1987-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 60: Nov-Dec 1988 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Lop-sided evolution We risk supersaturating our readers with the anomalies of evolution, but we simply cannot bypass an article that is introduced as follows: "An analysis of the fossil record reveals some unexpected patterns in the origin of major evolutionary innovations, patterns that presumably reflect the operation of different mechanisms." The most interesting "unexpected pattern" is the gross asymmetry between the diversification of life in the Cambrian explosion (about 440 million years ago) and that following the great endPermian extinction (a little over 200 million years ago). Biological innovation was intense in both instances; both biological explosions burst upon a life-impoverished planet. Many niches were unoccupied. Even so, all existing (and many extinct) phyla arose during the Cambrian explosion and none followed the Permian extinction. ". .. why has this burst of evolutionary invention never again been equaled? Why, in subsequent periods of great evolutionary activity when countless species, genera, and families arose, have there been no new animal body plans produced, no new phyla?" Some evolutionists blame the asymmetry on the different "adaptive space" available in the two periods. "Adaptive space" was almost empty at the beginning of the Cambrian because multicellular organisms had only begun to evolve; whereas after the Permian extinction the surviving species still represented a diverse group with many adaptations. (Just how the amount of "adaptive space" available was communicated to the ...
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... Science Frontiers ONLINE No. 61: Jan-Feb 1989 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Celestial Crucible "Catastrophic extinctions caused by impacts would change the rules governing who is most fit, who becomes extinct, and who survives. 'If much of the patterning of life's history is not set by Darwin's slow biotic mechanisms, then I think Darwin is in trouble. Is catastrophic mass extinction a major agent of patterning?' If so, 'impacts are a quirky aspect' of the process." Who is speaking within the single quotes above? S.J . Gould, a proponent of the punctuated equilibrium view of the evolutionary scenario. He added: "' The history of life is enormously more quirky than we imagined.'" In fact, the geological record shows so many quirk-inducing impacts that there is little room left for slow, plodding, uniformitarian evolution of the earth itself, life-in-general, and humanity. Mammals, for example, may not have survived the postulated (but now assumed factual) Cretaceous-Tertiary impact event simply because they were small in size - not smarter. (Kerr, Richard A.; "Huge Impact is Favored K-T Boundary Killer," Science, 242:865, 1988.) Comment. It now seems that Cassius was wrong about the stars when he was lining up Brutus to help assassinate Julius Caesar. And the "celestial" situ ation gets even worse below. From Science Frontiers #61, ...
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... All Issues This Issue Sourcebook Project Sourcebook Subjects Do large meteors/comets come in cycles?Only a few years ago, geologists refused to recognize any terrestrial meteor craters larger than Arizona's Meteor Crater, which is merely a mile or so in diameter. Now, we have a long list of craters or astroblemes (star wounds), some of which measure hundreds of miles across. In fact, there are enough large dated crters so that some scientists have taken up a time-honored human pastime: Looking for cycles or periodicities in the data. (Humans can find cyclicities in almost any collection of data!) To be more specific, some have claimed that large meteor craters come in clusters dated 28-31 million years apart. These catastrophic events have been correlated with biological extinctions, magnetic field reversals, and basalt flooding. The astronomical causes of this supposed periodicity range from the solar-system's crossing of the galactic plane, to the perturbations of an unseen solar companion, to regular perturbations of the Oort cloud of comets that is thought to hover at the fringe of the solar system. In short, a large, interlocking edifice of geological and astronomical speculation has been erected upon a foundation of terrestrial crater ages. But how well do we really know the ages of these craters? How complete is the cratering record? The answer to the first question is: "Not well at all." Further, we can be certain that many craters still lie undiscovered beneath sediments. In addition, most meteors/comets splashed into the oceans, leaving no ...
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... . Evidence of a global fire. Soot appears at the K-T boundary at many sites, but where did it come from? Chemical analyses of these soots show an enhanced concentration of polycyclic aromatic hydrocarbons over soots above and below the boundary. This is strong evidence of pyrolytic action at the K-T boundary; i.e ., widespread fires. (Venkatesan, M.I ., and Dahl, J.; "Organic Geochemical Evidence for Global Fires at the Cretaceous/Tertiary Boun dary," Nature, March 2, 1989.) Fire could have been initiated by either volcanism or impacts. The evidence of the traps. Traps, like India's famous Deccan Traps, are extensive flood basalts. In this paper, basalt flooding has been correlated with mass extinctions of marine life during the past 250 million years. The Deccan Traps were formed right at the K-T boundary. Traps could, however, be initiated by asteroid impact, which could stimulate eruptions. (Rampino, Michael; "Dinosaurs, Comets and Volcanoes," New Scientist, p. 54, February 18, 1989.) The dinosaur angle. If dinosaurs were truly susceptible to extinction by either asteroid impact, widespread volcanism, or some combination of both, one would expect to find their numbers and diversity drastically curtailed during Mesozoic impact events. Instead, the dinosaurs not only survived these impacts but prospered. Their demise, which began before the K-T event, was probably not due to either impact or vol canism. (Paul, Gregory S.; " ...
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... Science Frontiers ONLINE No. 53: Sep-Oct 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Meteor-impact winters, magnetic field reversals and tektites "Nuclear winter" is a term now in vogue. And, believe it or not, the rains of tektites discussed below may have been the forerunners of climatic catastrophes similar to the postulated nuclear winters. We shall call them "meteor-impact winters. First, a tad of background: Great meteor impacts and tektite events seem to have occurred nearly simultaneously with deep-cutting biological extinctions and reversals of the earth's magnetic field. Ever since this apparent synchrony was recognized a few decades ago, theorists have been vying in generating scientific scenarios, especially some mechanism that would reverse the earth's magnetic field. New entrants in the lists are R. Muller and D. Morris, two Berkeley physicists. Here is how they see it: "A sufficiently large asteroid or cometary nucleus hitting the Earth lofts enough dust to set off something like a 'nuclear winter.' The cold persists long after the dust settles because of the increased reflectivity of the snow-covered continents. In the course of a few centuries, enough equatorial ocean water is transported to the polar ice caps to drop the sea level about 10 meters and thus reduce the moment of inertia of the solid outer reaches of the Earth (crust and mantle) by a part in a million. 'That doesn't sound like much, Morris told us. 'But when we realized that ...
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... the New World for at least 300,000 years. "If confirmed, it would be the first proof of pre-Neanderthal man in the Americas and a severe blow to current theories that the first humans came here from Asia during the last Ice Age, only about 35,000 years ago. "The scientists also report that they have discovered what may be the world's oldest astronomical observatory. .. .. . "The signs of man were found in a cave called Toca da Esperanca (Grotto of Hope), deep in the black limestone cliffs of the Serra Negra mountains, 1,100 miles northeast of Rio de Janeiro. "The site caught the interest of the scientific community after archaeologist Maria Beltrao reported finding a stone implement and the cut bones of an extinct species of horse in the dig last year. "The bones were so old that they could not be dated by carbon-14, which can measure about 40,000 years. The Weak Radiation Laboratory in France tested them by a more sensitive uraniumthorium method, and came back with a staggering date of 300,000 years. .. .. . "A cave called Grotto of the Cosmos at nearby Xique-Xique contained paintings of suns, stars and comets, and this is what archaeologists believe is the oldest astronomical observatory in the Americas. "' There probably were at least two cultures here,' said (J .) Labeyrie. 'One, about 10,000 years ago, made the pain tings. Another, much older, was responsible for the artifacts ...
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... Science Frontiers ONLINE No. 56: Mar-Apr 1988 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Wandering Molluscs "How could a mollusc which lived all its adult life cemented fast to the seabed in shallow water occur thousands of kilometers apart in the Arabian Gulf and the Caribbean? Almost identical forms of the extinct bivalve Torreites sanchezi have been found in rocks from the Caribbean and the Gulf. Peter Skelton of the Open University and Paul Wright of the University of Bristol suggest that the larval stage of the bivalve must have 'island hopped.'" The two researchers rule out convergent evolution and note that the two seas were never any closer together. They suppose that in Cretaceous times there was an equatorial current that swept the larval forms long distances. (Anonymous; "Wandering Molluscs," New Scientist, p. 33, October 15, 1987.) Comment. The same situation prevails for other species, such as some of the amphipods and the unique life forms dependent on seafloor vents. From Science Frontiers #56, MAR-APR 1988 . 1988-2000 William R. Corliss ...
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... Columbia Plateau of western North America, the Parana Plateau of South America, and the Tungusska Basin of Siberia. All consist mostly of basalt lava flows; those on continents include minor quantities of rhyolite, and variable amounts of sediment. All seem to have appeared suddenly, within plates. No consistent context of plate interactions explains them. We suggest that large lava plateaus are indeed terrestrial maria." Alt et al go on to show that these lava plateaus seem to have initiated continental rifts and hotspot tracks where none existed before. A reasonable inference is that these plateaus are the consequence of the impacts of large meteorites. This is particularly the case with the Deccan Plateau, which is agedated as synchronous with the Cretaceous-Tertiary Boundary event, with its legacy of worldwide iridium deposits and the wholesale extinction of life. The paper concludes with: "It therefore appears that random encounters with vagrant asteroidal objects play an important role in setting the course of plate tectonic events. The earth does not control its own agenda." (Alt, D., et al; "Terrestrial Maria: The Origins of Large Basalt Plateaus, Hotspot Tracks and Spreading Ridges," Journal of Geology, 96:647, 1988.) From Science Frontiers #61, JAN-FEB 1989 . 1989-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 62: Mar-Apr 1989 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects DANCING TO THE COMETS' TUNE "When planetary scientists examine one kind of meteorite rich in iron, the H-chondrites, they find that the meteorites' ages do not spread evenly through time. Instead, the ages seem to cluster at 7 and 30 million years." Astronomers have hitherto been content to attribute these clumped ages to collisions among the meteorites' parent bodies - the asteroids - which ply periodic orbits. However, S. Perlmutter and R.A . Muller, at Berkeley, point to the apparent 26- to 30-million-year periodicities of three terrestrial phenomena: Biological extinctions in the fossil record, Magnetic field reversals, and Terrestrial-crater ages. Could there be a connection between the clumped meteorite ages and these terrestrial phenomena? Perlmutter and Muller propose that all of these phenomena are the consequence of periodic storms of comets that invade the inner solar system from the direction of the Oort Cloud of comets that purportedly hovers at the fringe of the solar system. These comets not only devastate the earth but also collide with the asteroids, knocking off those bits and pieces we call meteorites. (Anonymous; "Do Meteorite Ages Tell of Comet Storms?" Astronomy, 17:12, January 1989.) Comment. Unanswered above is the question of why comet storms should be periodic. One hypothesis is that Nemesis, the so-called Death Star, a dark companion of our sun, lurks ...
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... thinking in just a decade. F.T . Kyte et al have now provided additional details on meteoritic debris they first described in 1981. On the floor of the southeast Pacific, about 1400 kilometers west of Cape Horn, about 5 kilometers down, they found high concentrations of iridium in Upper Pliocene sediments about 2.3 million years old. Since the proposed projectile hit in very deep water, no crater was dug out. What did survive is called an "impact melt." This is debris rich in noble metals, such as iridium, and contains particles typical of a low-metal mesosiderite. Some 600 kilometers of the ocean floor received this debris. Kyte and his associates estimate the size of the impacting object at at least 0.5 kilometers in diameter. No biological extinctions are correlated with the 2.3 -million-year date, but there appears to have been a major deterioration of climate at about this time. There was a shift in the marine oxygen isotope records and, more obvious, the creation of the huge loess (sandy) deposits in China. What the impact may have done is to vaporize enough water into the atmosphere to increase the earth's albedo, reflecting sunlight back into space, lowering the average temperature, and thus triggering the Ice Ages. (Kyte, Frant T., et al; "New Evidence on the Size and Possible Effects of a Late Pliocene Oceanic Asteroid Impact," Science, 241:63, 1988.) Comment. Aficionados of the Ice Age problems will have to add this theory to ...
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... mantle and which contains billions of tons of volatiles, probably including hydrogen; and the origin of the moon from the earth after the formation of the earth's core." " Editor's Note . This article by John O'Keefe puts forth a viewpoint with which most planetologists disagree strongly. On the ground that a fresh airing of the long-standing discussion on lunar volcanism is appropriate, Eos offers this article, untouched by editors or referees, and awaits reply by readers." O'Keefe's article reviews considerable evidence supporting his two points: for Point One; crater dimensions and frequencies, craters with dark floors, lunar soil constituents; and, for Point Two; tektite analysis. He also remarks that the ages of the terrestrial tektite fields correlate with biological extinctions. This can be explained in terms of lunar volcanism as follows: lunar volcanos expel material violently, some of which escapes the moon's gravitational field and is drawn toward earth. Some falls as tektites; the rest forms a temporary ring around the earth. The ring shadows parts of the earth, causing radical climate changes and, as a consequence, biological extinctions. (O 'Keefe, John A.; "The Coming Revolution in Planetology," Eos, 66:89, 1985.) Comment. The Editor's Note does not really convey the depth of the antagonism in the controversy about tektite origin. From Science Frontiers #39, MAY-JUN 1985 . 1985-2000 William R. Corliss ...
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... of night. From force of habit, he scanned the woods, his spotlight punching through black walls of rain. And there in the beam was one of the strangest creatures he had ever seen. About the size and shape of a dog, it was covered with stripes that ran from its shoulders across its back to its thick, rigid, tail. "The animal stood still as the startled ranger counted the stripes, then it nonchalantly gave an enormous jaw-stretching yawn. But when the ranger reached for his camera, the creature faded into the undergrowth, leaving nothing but a rank smell. It also left a trail of excitement, for the bizarre beast looked exactly like a Tasmanian tiger -- also called a thylacine or Tasmanian wolf -- an animal thought to have been extinct nearly 50 years ago." Hundreds of people claim they have spotted the Tasmanian tiger since the last captive died in 1936, but we have no good photos or other "proofs." Mediaman Ted Turner has offered a prize of $100,000 for "verifiable evidence" that the Tasmanian tiger still lives. Consequently, the Tasmanian wilds are being combed diligently and automatic cameras, triggered by infrared beams, are being set up in likely spots. (Bunk, Steve; "Just How Extinct Is Tasmania's Tiger?" International Wildlife, 15:37, July-August 1985. Cr. M.J . Shields) Reference. Evidence for the survival of the Tasmanian tiger (thylacine) may be found in BMD12 in our catalog: Biological Anomalies: Mammals II ...
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... Science Frontiers ONLINE No. 43: Jan-Feb 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Cretaceous Incineration The worldwide deposit of iridium at the end of the Cretaceous implies, to many at least, that the great biological extinctions of this period were the consequence of a meteorite impact. It has now been discovered that clay samples from the Cretaceous-Tertiary boundary also contain 0.36-0 .58% graphitic carbon. It is fluffy stuff and suggests that the planet was once covered by a thick layer of soot. Quantitatively, the soot layer is equivalent to the carbon in 10% of the earth's present biomass. The authors speculate that this soot was created by huge wildfires that consumed much of the earth's vegetation and perhaps fossil fuel as well. Terrestrial life was, of course, devastated -- just as it is in the currently popular "nuclear winter" scenarios. The end-of-the-Cretaceous soot is in fact, thicker and more widely spread than nuclear winter theories predict. (Wolbach, Wendy S., et al; "Cretaceous Extinctions: Evidence for Wildfires and Search for Meteoric Material," Science, 230:167, 1985.) Comment. Questions arise, though: How could a single meteorite impact ignite worldwide wildfires? Why haven't other meteorite impacts, recorded abundantly by large craters and astroblemes, also set fire to the planet and left iridium layers? From Science Frontiers #43, JAN-FEB 1986 . 1986-2000 William ...
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... 165 feet in diameter. Their heights are 2 to about 15 feet. All of the material making up the mounds seems to come from the immediate surroundings: coral debris, earth, and grains of iron oxide. The larger tumuli enclose a block of tuff, about 5 feet high and 6 feet in diameter, comprised of tumuli material held together by a calcareous cement or mortar. Some who have investigated these mounds believe that the presence of cement, presumably man-made, is proof-positive that the tumuli are the product of human activity. Other archeologists doubt this because the early settlers of New Caledonia did not use cement. Besides, there seem to be no other signs of human involvement. This has led to the hypothesis that the mounds were built by huge, now-extinct, flightless birds for the purpose of incubating their eggs. Some birds do indeed incubate their eggs in mounds today; and some 5,000 years ago New Caledonia did boast a giant bird (Sylviornia neocale doniae), which was 5-6 feet tall. The authors of the present paper feel that the giant bird hypothesis is just as reasonable as the theory that these mounds were built by ancient humans who knew how to make cement. (Mourer-Chauvire, Cecile, and Poplin, Francois; "Le Mystere des Tumulus de Nouvelle-Caledonie," La Recherche, 16: 76, September 1985. Cr. C. Mauge.) Comment. We find in our Handbook Ancient Man an article by A. Rothovius entitled: "The Mysterious Cement Cylinders of New Caledonia ...
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... Science Frontiers ONLINE No. 47: Sep-Oct 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Two Points Of Great Impact Geologists have been searching in vain for a large crater that might account for the biological extinctions at the Cretaceous-Tertiary boundary some 65 million years ago. C.J .H . Hartnady believes he had found the culprit. It is somewhat larger than expected (300 kilometers in diameter instead of 100200), but it is of the right age. Supporting this notion is the observation that the Seychelles Bank and Madagascar suddenly shifted their locations at about this time. (Murray, M.; "Point of Impact: The Indian Ocean," Science News, 129:356, 1986.) The existence of another terrestrial cat aclysm at an earlier date is suggested by a layer of shattered crustal rock fragments stretching over at least 260 kilometers in South Australia. Folded within Precambrian marine shales, these fragments reach 30 centimeters in diameter and show evidence of vertical fall. Evidence points to an origin near Lake Acraman, about 300 kilometers west. (Gostin, Victor A., et al; "Impact Ejecta Horizon within Late Precambrian Shales, Adelaide Geosyncline, South Australia," Science, 233:198, 1986.) Reference. The subject of very large terrestrial craters is discussed in ETC2 in our catalog: Carolina Bays, Mima Mounds. Description here . The Amirante Basin (black circle) lies about 500 kilometers north-east of Madagascar. From Science Frontiers #47, SEP-OCT ...
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... Science Frontiers ONLINE No. 46: Jul-Aug 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Tigers in western australia?The title of course refers to the Tasmanian tiger or wolf or thylacine. We reported above on the possibility of a small relict population of Tasmanian tigers in Tasmania, where the supposedly last specimen expired in a Hobart zoo in 1936. There is now good evidence that the thylacine also roams Western Australian, where it has been believed extinct for thousands of years! At hand are photographs, casts of footprints, a carcass that may be very recent, and many eye-witness reports. Much of the recent evidence has been gathered by Kevin Cameron, a first-rate bushman with two superbly trained dogs. A.M . Douglas, the author of this article and formerly Senior Experimental Officer at the Wetern Australian Museum in Perth was skeptical about living thylacines at first but is now a firm believer. He states, "I think Kevin Cameron has made the single most important wildlife discovery of this century." (Douglas, Athol M.; "Tigers in Western Australia?" New Scientist, p. 44, April 24, 1986.) From Science Frontiers #46, JUL-AUG 1986 . 1986-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 49: Jan-Feb 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Geomagnetic Reversals From Impacts On The Earth R.A . Muller and D.E . Morris review the evidence tying geomagnetic reversals to the impacts of large bodies with the earth: the tektites and microtektites; the climate changes; the biological extinctions, etc. Then they propose a physical mechanism for geomagnetic reversals: "The impact of a large extraterrestrial object on the Earth can produce a geomagnetic reversal through the following mechanism: dust from the impact crater and soot from fires trigger a climate change and the beginning of a little ice age. The redistribution of water near the equator to ice at high latitudes alters the rotation rate of the crust and mantle of the Earth. If the sea-level change is sufficiently large ( 10 meters) and rapid (in a few hundred years), then the velocity shear in the liquid core disrupts the convective cells that drive the dynamo. The new convective cells that subsequently form distort and tangle the previous field, reducing the dipole component near to zero while increasing the energy in multipole components. Eventually a dipole is rebuilt by dynamo action, and the event is seen either as a geomagnetic reversal or as an excursion." (Muller, Richard A., and Morris, Donald E.; "Geomagnetic Reversals from Impacts on the Earth," Geophysical Research Letters, 13:1177, 1986.) Comment. That the earth's field is generated by internal dynamo action is ...
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... Science Frontiers ONLINE No. 36: Nov-Dec 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Case Against Impact Extinctions The neocatastrophists seem to be getting overly smug with their iridium-rich deposits at the Cretaceous-Tertiary boundary. Is there really incontrovertible evidence that a large asteroid or comet hit the earth at this point in history, causing widespread biological extinctions? To add some perspective, Leigh M. Van Valen has tossed 15 arguments against impact extinctions on the scales. Ten of these are reproduced below, as taken from Nature. More de-tails may be found in Paleobiology, 10: 121, 1984. Freshwater life was unaffected; In Montana and its vicinity, the last occurrence of dinosaurs was detectably below the crucial boundary; Transitional floras also exist below the boundary; Apparently extraterrestrial material exists below the boundary; The expected effects of eliminating atmospheric ozone are missing; The Cretaceous-Tertiary boundary is coincident with a very large marine regression, suggesting a nonextraterrestrial cause; Marsupials but not placentals were nearly eliminated, while most aboreal multituberculates (a type of vertebrate) and birds survived; The predicted cooling effects on the earth are absent; The predicted effects of acid rain cannot be found; and Assuming a marine impact, no turbidites can be found; assuming a land impact, no large terrestrial crater has been discovered. (Van Valen, Leigh M.; "The Case against Impact Extinctions," Nature, 311:17, 1984.) From Science Frontiers #36, NOV-DEC 1984 . ...
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... Science Frontiers ONLINE No. 31: Jan-Feb 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Wanted: disasters with a 26-million-year period J. Sepkoskiand and D. Raup, two researchers at the University of Chicago, have drawn up graphs showing the numbers of families of marine organisms that have vanished from the fossil rec ord over the eons. From this overview of manifest mass extinction emerged a puzzling and potentially profound pattern. Roughly every 26 million years over the last 250 million years, the number of extinctions jumped well above the background level. Some cyclic phenomenon seems to have been killing off life forms on a systematic basis. But no natural 26-million-year cycles are known although meteors and comets are favored causes of mass extinctions these days, they display no such cyclic period. (Simon, C.; "Pattern in Mass Extinctions," Science News, 124:212, 1983.) Comment. Instead of looking outward to astronomical catastrophism, perhaps we should look inward. The earth itself may undergo cyclic paroxysms; or life might undergo intrinsic phases of decline and rejuvenation. Periodic events in the evolutionary time scale. The 300-million-year cycle shown involves alternations between "icehouse" conditions (O ) and "greenhouse" conditions (G ). These may be due to changes in heat convention within the earth. From Science Frontiers #31, JAN-FEB 1984 . 1984-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 37: Jan-Feb 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects More Doubts About Asteroids In an apparent reaction to the stampede to climb aboard the extinction-by-asteroid bandwagon, dissenting papers have begun to appear in the scientific literature. For example, Van Valen's list of objections to the hypothesis of asteroid impact at the Cretaceous-Tertiary boundary was reproduced in the last issue of Science Frontiers. Now, in a recent issue of New Scientist, T. Hallam raises still more objections: Tropical plants, mammals, crocodiles, birds, and benthic invertebrates were little affected by whatever happened at the Cretaceous-Tertiary interface. Furthermore, many groups that were extinguished were already well into a decline. Some geologists insist that some of the supposedly synchronous extinctions were probably separated by several hundred thousand years; viz., plankton and dinosaurs. The vaunted iridium anomaly in deep-sea cores is spread through a considerable thickness of sediment. Even after allowing for the mixing of sediments, the iridium-rich layer is thousands of years thick. According to the asteroid scenario, the clay layer separating the Cretaceous from the Tertiary should represent the fallout from impact-raised dust, which would include asteroidal material and a mixed sample of earth rocks. However, in Denmark, the boundary is marked by the so-called Fish Clay, which is almost pure smectite -- a single mineral and not a mixture of terrestrial rock flour. If it wasn't an asteroid impact, why the ...
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... Science Frontiers ONLINE No. 37: Jan-Feb 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Recent Pulsations Of Life At a recent meeting of scientists at the Lamont-Doherty Geological Observatory, E. Vrba, of the Transvaal Museum, in Pretoria, stated: "If we eventually are able to establish a good time resolution with the continental record, I expect to be able to discern synchronous pulses of evolution that involve many groups of fauna and flora. Many different lineages in the biota will respond by synchronous waves of speciation and extinction to global temperature extremes and attendant environmental changes. This is my starting hypothesis." Vrba was speaking mainly about the last 25 million years, a mere flash in geological time. For this brief period, the Deep Sea Drilling Program has provided geologists with a detailed and continuous record of climate changes as they were recorded in deep-sea sediments. By contrast, the faunal history of the continents is rather fragmentary, making it rather difficult to match up pulsations of climate with pulsations of life. Even so, scientists have found rather strong correlations between climatary change and biological speciation and extinction at 15, 5, and 2.4 million years ago. (Lewin, Roger; "The Paleoclimatic Magic Numbers Game," Science, 226:154, 1984.) Comment. Note that this is just the period our ancestors seemed to be evolving rapidly. Also interesting is the general agreement between Vrba's statement about the driving forces behind evolution and McClintock's conclusion quoted earlier ...
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... Science Frontiers ONLINE No. 30: Nov-Dec 1983 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Non-lethal tektites It is the fashion these days to blame the many so-called "extinctions" prevalent in the fossil record on extraterrestrial cataclysms. Some deposits of tektites and microtektites have indeed been correlated with the disappearances of some species. Since tektites are supposedly formed during meteor collisions with the earth, many scientists thought the evidence, circumstantial though it may be, very convincing. What has not been publicized as well is the fact that many microtektites, particularly in sediments 30-40 million years old, have no correlations whatsoever with any important biological extinctions. (Anonymous; "Non-lethal Tektites," New Scientist, 99:345, 1983.) Reference. The many paradoxes and anomalies associated with tektites are cataloged at ESM3 in: Neglected Geological Anomalies. Information on this book may be found here . From Science Frontiers #30, NOV-DEC 1983 . 1983-2000 William R. Corliss ...
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... and Cambrian life forms to preserve the continuity of life. This has proved difficult, and some scientists now feel that The Edicaran approach to "largeness" was to increase surface area externally. The Ediacarans were therefore shaped like pancakes, tapes, fans, etc. This enabled them to present large areas to the environment for respiration, feeding, and other biological functions. In contrast, many present life forms achieve "largeness" by increasing internal areas, as in the lungs, folded intestines, etc., along with the forced circulation of air, blood, and other sub stances. This latter approach survived, while the two-dimensional Ediacaran Experiment did not. The demise or extintcion of the Ediacarans led Gould, the author of this far-ranging article, to the influence of extinctions on life in general -- a hot topic these days. Gould stated that with natural selection operating, one would expect continual "improvement" in life forms, but that this had not happened. "I regard the failure to find a clear 'vector of progress' in life's history as the most puzzling fact of the fossil record. But I also believe that we are now on the verge of a solution, thanks to a better understanding of evolution in both normal and catastrophic times. We need a twotiered explanation for patterns (or non-patterns) in the history of life." The first tier of explanation involves the theory of punctuated equilibrium, as championed by Gould and Eldredge. Gould says he once thought that punctuated evolution would be sufficient to explain all ...
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... Science Frontiers ONLINE No. 33: May-Jun 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects A Real Death Star As reported in SF#31, the geological record seems to show that widespread biological extinctions have occurred about every 26 million years. Coupled with this is Walter Alvarez's recent observation that terrestrial impact craters 10kilometer-diameter and up have been blasted out episodically -- every 28.4 million years on the average. This figure is close enough to 26 million years to impel some astronomers to search for a periodic source of cosmic projectiles. R.A . Muller and M. Davis, at Berkeley, think they have found one. They postulate that the solar system is really a double-star system. Our sun's companion star has only about 0.1 solar mass and is so faintly luminous that we have not found it visually. It does, however, now cruise along its orbit some 2.4 light years away. But it will be back! In fact, it returns every 26 million years to jostle the Oord Cloud of comets that hovers on the fringe of the solar system. This nudging periodically sends a large shower of comets careening around the inner solar system. The earth intercepts one or more of these projectiles each visit and -- bang -- we have new craters and another biological catastrophe. (Anonymous; "A Star Named George," Scientific American, 250:66, April 1984.) Comment, Ho hum! Still another cometary impact scenario ...
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... Science Frontiers ONLINE No. 34: Jul-Aug 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Behind magnetic flip-flops The earth's magnetic field frequently reverses its polarity. Such flips can of-ten be correlated with climate changes, global ice volumes, sea-floor spreading rates, and deposition of black shales, tektite falls, biological extinctions, etc. The frustrating thing is the lack of clear-cut cause and effect; that is, how these phenomena are linked physically to the geomagnetic field. Part of the problem is that we can only guess at how the geomagnetic field is generated. Let us assume that the earth's magnetic field is created by dynamo action in the planet's fluid core. P. Olson finds analytically that the core dynamo may reverse sign due to fluctuations in core turbulence caused by two competing energy sources: heat loss at the mantle-core boundary and progressive growth of the inner core. In concept, the heat lost at the core-mantle boundary might be linked to climate changes and sea-floor spreading. Taking a different tack, D. Gubbins has investigated the possibility that field reversals are triggered by ice ages and meteorite impacts (tektite falls). The physical mechanism here would be the increase in pressure upon the core, which affects the rate of freezing in the outer core, and thus the power available to the core dynamo. Gubbins found that these externally caused pressure changes were too small to explain the polarity changes. However, the parameters involved ...
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... mechanical, thermal, chemical; in fact, almost anything. McClintock's conclusion is: ". .. that stress, and the genome's reaction to it may underlie many formations of new species." (McClintock, Barbara; "The Significance of Responses of the Genome to Challenge," Science, 226:792, 1984.) Comment. The implications here are broad and deep. Evolution can be driven by external stresses. The new species thus produced may differ substantially from the original organism, eliminating the need to look for "missing links" in the fossil record. What "hope-ful monsters" are latent in our human genome, awaiting only the right stresses to manifest themselves? And is the genomes's malleability reversible; that is, can extinct species be recovered when the engendering stresses are removed? From Science Frontiers #37, JAN-FEB 1985 . 1985-2000 William R. Corliss ...
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... warming. Temperature gradients, and thus density gradients, from pole to equator decrease in surface waters, and the deep ocean currents of oxygenated polar waters wane. Oxygen minimum zones intensify and widen; anoxic conditions throughout entire basins are indicated by black shales deposited in the deep sea. These relations thus suggest that the earth's interior processes and its climates are related and their status recorded by both magnetic polarity and anoxic event chronologies of the earth." (Force, Eric R.; "A Relation among Geomagnetic Reversals, Seafloor Spreading Rate, Paleoclimate, and Black Shales," Eos, 65:18, 1984.) Comment. But what stopped and restarted the magnetic reversals and other concurrent processes? Strangely enough, the quiet, anoxic periods do not seem to coincide with biological extinctions! From Science Frontiers #32, MAR-APR 1984 . 1984-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 25: Jan-Feb 1983 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Why don't we all have cancer?Biologists have just found that the difference between a normal human gene responsible for manufacturing a specific protein and a gene causing cancer is the replacement of a single nucleotide by another in a very long string of nucleotides. This is a very delicate situation. The difference between cancer and no cancer is simply too tiny. Given the high frequency of random changes (mutations), we should all have cancer. One implication is that humans (and other animals, too) have come up with some method of preventing or correcting these minor mutations -- otherwise we would have become extinct long ago. No one knows what this mechanism is or why it sometimes fails. (Anonymous; "More Speculation about Oncogenes," Nature, 300;213, 1982.) Reference. Other anomalies of cancer are cataloged in BHH23-35 in: Biological Anomalies: Humans II. For a description of this volume, visit: here . From Science Frontiers #25, JAN-FEB 1983 . 1983-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 23: Sep-Oct 1982 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The cretaceous-tertiary extinction bolide The recently discovered worldwide iridium-rich layer is taken by many scientists as evidence of the collision of an asteroid or comet with the earth about 65 million years ago. This cataclysmic event is also blamed (by some, at least) for the apparent sudden biological extinctions recorded on these pages of the fossil record. In this setting, the authors of this paper calculate the effects on the earth of a 10-kilometer-diameter object impacting at about 20/km/sec. Do the theoretical results jibe with the geological and paleontological data? Very definitely. Crater ejecta rich in extraterrestrial material would be blasted to an altitude of 10 km, where winds would insure global distribution. In terms of biological stress, the 10-km projectile would transfer 40-50% of its kinetic energy to the atmosphere, creating a heat pulse that could raise global temperatures 30 C (50 F) for several days. Many large animals might well succumb to such a temperature transient. In addition, the protective ozone layer might be blown away by shock waves and not reform for a decade. (O 'Keefe, John D., and Ahrens, Thomas J.; "Impact Mechanics of the Cretaceous-Tertiary Extinction Bolide," Nature, 298,123, 1982.) Reference. We catalog biological extinctions at ESB1 in Anomalies in Geology. To order this book, visit: here ...
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... Science Frontiers ONLINE No. 8: Fall 1979 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Iridium And Mass Extinctions Alvarez and his colleagues at the University of California, while chemically analyzing a series of sedimentary strata from Italy, discovered that one layer had 25 times the concentration of iridium residing in adjacent strata. The iridium-rich layer forms the boundary between the Cretaceous and Tertiary periods, 65 million years ago. During that death-filled interval, 50% of the earth's genera were wiped out. Such are the two correlated facts: iridium increase and mass extinction. But do they have the same cause? Alvarez et al point out that iridium is rare on earth but much more common out in space. The anomalous concentration of iridium could have been injected by a massive solar flare, a big meteor impact, or come other extraterrestrial catastrophe. Thus is catastrophism being resurrected. (Anonymous; "An Iridium Clue to the Dinosaur's Demise," New Scientist, 82: 798, 1979.) From Science Frontiers #8 , Fall 1979 . 1979-2000 William R. Corliss ...
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