... 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 ...

... Science Frontiers ONLINE No. 50: Mar-Apr 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Connecticut "boat" cairn An unusual, large stone cairn is located atop Rattlesnake Hill in Connecticut's Natchang State Forest. At an elevation of 640 feet, it commands an almost 360 view. Its long axis is aligned with the Pole Star. The cairn seems to have been constructed according to some plan rather than just being a deposit of cleared stones. One's first impression is that it resembles a boat. Could it be a Norse "ship burial" such as found in Europe? It is impossible to prove such a conjecture without tearing the cairn apart. (Whittall, James P., II; "The 'Boat" Cairn, Chaplin, Connecticut," Early Sites Research Society Bulletin, 12:39, December 1986.) A side view ofthe Connecticut "boat" cairn. From Science Frontiers #50, MAR-APR 1987 . 1987-2000 William R. Corliss ...

... Science Frontiers ONLINE No. 50: Mar-Apr 1987 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Magnetic Precursors Of Large Storms On January 22, 1986, a magnetometer at the Fredricksburg Magnetic Observatory, in Virginia, recorded a sudden jump (of 45 gammas) in the earth's horizontal magnetic field component. Alerted to this, G. Wollin, at the Lamont-Doherty Geological Observatory, immediately predicted that a major snowstorm or flooding rains would hit northeastern states within six days. Wollin contacted the weather people in the region, but they discounted the prediction because satellite pictures and conventional weather indicators implied nothing of the sort. A three-day storm began on January 25, depositing 3 feet of snow in northern New England and 4 inches of rain along the coast from Washington to Boston. Wollin has had similar successes, without even looking at a weather map! Obviously, Wollin's forecasting techniques are not yet part of the Weather Bureau's arsenal. This is not too surprising because even Wollin does not understand why major storms should be preceded by several days by nervous magnetometers. He talks in a tentative way about solar storms, which do affect terrestrial magnetism, dumping energy into the oceans and thence into the atmosphere. But this is mainly speculation. Historically, we do know that long-term changes in the earth's magnetic field are linked to global temperature levels (see graphs); but here, too, cause and effect are not obvious. (Gribbin, John; "Magnetic Pointers ...

... Science Frontiers ONLINE No. 139: Jan-Feb 2002 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects White Mars?Earth is called the "blue planet" by virtue of its thin veneer of blue ocean water. Mars is now red because of its endless vistas of reddish soil and rocks, But most planetary scientists now insist that Mars was once blue, too. It was drained by gushing rivers and supported a vast ocean. The planet's many channels and layered deposits seem to prove Mars was, like Earth, once a water-rich planet. We like to think this way because we so much want to find life on our sister planet, and to us water is life! Not so fast! says N. Hoffman from La Trobe University in Victoria, Australia. According to his hypothesis, water has had little or no importance in shaping the Martian landscape. Instead, his 'White Mars' model contends that the gurgling, frothing and sometimes explosive venting of carbon dioxide gas from beneath the surface created the features. Outrageous as Hoffman's hypothesis is, it is supported by several significant observations that seem to deny a watery Mars. The Mars Global Surveyor has not detected any carbonate minerals that should have been created when water interacted chemically with the planet's CO2 atmosphere. Surface photos fail to show the fine networks of tributaries that should have fed the larger drainage features if water were the agent of erosion. There is no evidence of large lakes or reservoirs at the heads of the so- ...

... Frontiers ONLINE No. 66: Nov-Dec 1989 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Biogenic Minerals We generally think of minerals as having been formed by purely inorganic processes. Only once, on p.000. where biogenic stalactites were described, have we persued the idea that minerals, including crystal forms, might be biogenic. We now have at hand a survey of biogenic minerals. It turns out that biogenic minerals are quite common - so common, in fact, that the Gaia concept is recalled, in which biological processes preside over much that happens upon this planet. Here follows a sampler of some biogenic minerals: Much, if not all, travertine (calcite and/or aragonite) and silicious sinter (opal) are deposited through algal action. Much pyrite and marcasite in sedimentary rocks comes from bacterial sulfate reduction. Bacterial breakdown of oil produces organic complexes that dissolve, transport, and precipitate quartz. The reknowned Herkimer "diamonds" may be of biological origin. Living cells synthesize isometric crystals of magnetite. Mitochondria manufacture crystals of hydroxylapatite. Better known are the apatite in bones and teeth and the aragonite, calcite, or fluorite in the vestibular systems of vertebrates. (Dietrich, R.V ., and Chamberlain, Steven C.; "Are Cultured Pearls Mineral?" Rocks and Minerals , 64:386, September/October 1989. Cr. R. Calais) From Science Frontiers #66, NOV-DEC 1989 . 1989-2000 William R. Corliss ...

... Science Frontiers ONLINE No. 45: May-Jun 1986 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects When Antarctica Was Green Something is wrong with our recent history of Antarctica. Conventional wisdom insists that the continent has been ice-covered for over 15 million years. But now Peter Webb and his coworkers have found pollen and the remains of roots and stems of plants in an area stretching some 1300 kilometers along the Transantarctic Mountains. The Antarctic wood is so recent that it floats and burns with ease. Webb's group postulates that a shrub-like forest grew in Antarctica as recently as 3 million years ago. The dating, of course, is critical, and is certain to be subjected to careful scientific scrutiny. Nevertheless, these deposits of fresh-looking wood do suggest that trees recently grew only 400 miles from the South Pole. Also of interest is the fact that the sedimentary layers containing the wood have been displaced as much as 3000 meters by faults, indicating recent large-scale geological changes. (Weisburd, S.; "A Forest Grows in Antarctica," Science News, 129:148, 1986.) From Science Frontiers #45, MAY-JUN 1986 . 1986-2000 William R. Corliss ...

... Science Frontiers ONLINE No. 11: Summer 1980 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Bering Strait Theory Again In Trouble If humans first populated North America via the Bering land bridge 10-20,000 years ago, how did human bones and artifacts get buried under a 50,000-year-old alluvial fan in California? Dogma demands that such finds be discredited. Thus, "Pleistocene Man at San Diego," the Calaveras Skull, and dozens of other archeological anomalies have been dismissed as the hoaxes and misidentifications of nonprofessionals. The latest hint of truly ancient man in America came after heavy rains in 1976 cut through 21 meters of deposits at Yuha Pinto Wash, just north of the Mexican border in California. The artifacts, still firmly in place, and associated bones are undeniably human. The overlying sediments are dated at more than 50,000 years old. (Childers, W. Morlin, and Minshall, Herbert L.; "Evidence of Early Man Exposed at Yuha Pinto Wash," American Antiquity, 45:297, 1980.) Reference. More evidence against the Bering land bridge hypothesis may be found in Ancient Man. This Handbook is described here . From Science Frontiers #11, Summer 1980 . 1980-2000 William R. Corliss ...

... camel pelvis. The dilemma posed by such dates is clearly stated in the following quotation from the conclusions of the subject article. "The evidence outlined here consistently indicates that the Hueyatlaco site is about 250,000 yr old. We who have worked on geological aspects of the Valsequillo area are painfully aware that so great an age poses an archeological dilemma. If the geological dating is correct, sophisticated stone tools were used at Valsequillo long before analogous tools are though to have been developed in Europe and Asia. Thus, our colleague, Cynthia Irwin-Williams, has criticized the dating methods we have used, and she wishes us to emphasize that an age of 250,000 yr is essentially impossible." (Steen-McIntyre, Virginia, et al; "Geologic Evidence for Age of Deposits at Hueyatlaco Archeological Site, Valsequillo, Mexico," Quaternary Research, 16:1 , 1981.) Comment. The above impasse is reminiscent of Lord Kelvin's insistence that the earth is only about 100,000 years old based upon his calculations of the sun's energy-producing capabilities. Geologists thought otherwise, requiring roughly a billion years for nature to sculpt the earth they saw. Kelvin didn't reckon on nuclear energy, and the geologists had the last laugh! From Science Frontiers #21, MAY-JUN 1982 . 1982-2000 William R. Corliss ...

... Science Frontiers ONLINE No. 28: Jul-Aug 1983 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Alaskan Jigsaw Puzzle Alaska seems to be plastered together from bits and pieces that originated far from the present position of this state. The units that now make up southern Alaska, for example, started north of the equator 250 million years ago, crossed into the southern hemisphere, and started back north about 160 million years ago. However, the itinerary of northern Alaska cannot even be guessed at. Present thinking is that this portion of the state was close to the geographic north pole during the late Cretaceous. But this is the period when the huge coal deposits were formed on the Arctic slope. Much of this coal comes from evergreens, which could not have survived in high latitudes due to the lack of sunlight. So, the pieces of the puzzle are at hand, but their travels are a mystery. (Anonymous; "Fragmented Alaska," Open Earth, no. 17, 1982.) Reference. For more on exotic terranes, see ESR9 in our Catalog: Inner Earth. Ordering information here . From Science Frontiers #28, JUL-AUG 1983 . 1983-2000 William R. Corliss ...

... 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 ...

... species of dinosaurs. But wait, the latitude there is 70 north today and according to magnetic measurements of the rocks, it was about the same when the dinosaurs met their demise. At these high latitudes the dinosaurs either had to contend with two months of darkness each year or they had to migrate many hundreds of miles over the rough Alaskan landscape. The visions of dinosaurs groping for tons of vegetable food in the polar night is about as incongruous as imagining them trekking down to the Lower 481 Scientists are now maintaining that these dinosaurs did prosper on the shore of the Arctic Ocean, even in the dark, because the climate then was semitropical or temperate. This was because the earth's climate was more equable or uniform. They are, however, surprised by the lack of mineral deposition in the dinosaur bones, which look rather "mode m". (Anderson, Ian; "Alaskan Dinosaurs Confound Catastrophe Theorists, " New Scientist, p. 18, August 22, 1985. ) (The apparent survival of dinosaurs during two months of darkness is being used as an argument against asteroidal catastrophism, which it is claimed wiped out the dinosaurs with a long-lived dust cloud that blocked the sun. WRC) From Science Frontiers #42, NOV-DEC 1985 . 1985-2000 William R. Corliss ...

... the sediments is only 4240 years old! Actually, it could be even 500-3000 years younger than that for two reasons: (1 ) The organic debris that was C-14-dated may have taken many years to become incorporated in the sediments; and (2 ) The dating may be skewed by older material in the sediments. By subtraction, the oil might be as young as 1240 years! The picture geologists draw of the Guaymas Basin is that of a spreading center covered by perhaps a half kilometer of sediments. Spewing up from the spreading center is hot water at 300-350 C, which "cracks" the organic material in the sediments, converting it into petroleum only 10-30 meters below the sea floor. (Hecht, Jeff; "Youngest Oil Deposit Found below Gulf of California," New Scientist, p. 19, April 6, 1991.) Comment. Since spreading centers are really cracks in the earth's crust, it is possible that some of the feed materials for this modern "petroleum factory" in the Guaymas Basin could consist of abiogenic, primordial methane and other organics seeping up from deep within the earth. Reference. Many questions remain about the origin and migration of oil. Many of these are discussed in ESC13 in our catalog: Anomalies in Geology. Details here . From Science Frontiers #76, JUL-AUG 1991 . 1991-2000 William R. Corliss ...

... the "benefits" of civilization are brought to India and China. Two questions must be answered: (1 ) Why is the incidence of diabetes mellitus only 8% among American junkfood-eating couch potatoes? Probable answer: natural selection has already modified the American genotype by eliminating those who are supersensitive to diabetes mellitus under conditions of rich diets and sedentary lives. (2 ) Why are modern populations still living under Spartan conditions so sensitive to diabetes in the first place? Possible answer: the so-called "thrifty genotype" hypothesis. In this view, the genotype that is sensitive to diabetes also confers survival advantages in societes where food supplies are meager and unpredictable. This genotype provides for a hair-trigger release of insulin for the rapid conversion of rare food gluts into body fat deposits that will sustain the individual during the next famine. Unfortunately, when rich food is continuously available, people with this "hairtrigger" genotype succumb to diabetes. (Diamond, Jared M.; "Diabetes Running Wild," Nature, 357:362, 1992.) From Science Frontiers #82, JUL-AUG 1992 . 1992-2000 William R. Corliss ...

... similar to in reservoir temperatures." Stetter et al favor the theory that these hyperthermophiles were injected into the reservoirs through: (1 ) drilling and secondary-recovery operations; and/ or (2 ) natural penetration via faults and seeps. They pointedly distance themselves from the idea, championed by T. Gold, that subterranean bacteria are actually permanent ancient residents of a deep subterranean biosphere. (Stetter, K.O ., et al; "Hyperthermophilic Archaea Are Thriving in Deep North Sea and Alaskan Oil Reservoirs," Nature, 365:743, 1993.) On the other hand, in their comments on the above paper, J. Parkes and J. Maxwell do not shy away from the theory that these denizens of hot, deep oil reservoirs are really indigenous life forms deposited with sediments in distant geological ages, surviving still and even evolving and conquering the infernal regions. They say: "The results presented do, however, provide firm evidence for the presence of a subterranean biosphere in oil reservoirs; moreover they are consistent with demonstrations of the existence of other deep biospheres in aquifers and marine sediments, which together indicate that the biosphere is not just a thin veneer on the geosphere." (Parkes, John, and Maxwell, James; "Some Like It Hot," Nature, 365:694, 1993.) From Science Frontiers #91, JAN-FEB 1994 . 1994-2000 William R. Corliss ...

... Icebergs Invaded The North Atlantic "Observations of large and abrupt climate changes recorded in Greenland ice cores have spurred a search for clues to their cause. The search has revealed that at six times during the last glaciation, huge armadas of icebergs launched from Canada spread across the northern Atlantic Ocean, each triggering a climate response of global extent." The foregoing abstract does not mention the interesting Heinrich layers that fostered the above scenario. In 1988, H. Heinrich published a paper describing a curious set of sedimentary layers found in cores drilled in the tops of the Dreizack seamounts in the eastern North Atlantic. Heinrich concluded that each of the six layers he found represented the melting of "six great armadas of icebergs." These icebergs carried debris picked up in Canada and, as they melted, deposited it on the seamounts and ocean floor. Each layer could be correlated with the major climate boundaries revealed by the Greenland ice cores. Very fittingly, these iceberg incursions are now termed "Heinrich Events." (Broecker, Wallace S.; "Massive Iceberg Discharges as Triggers for Global Climate Changes," Nature, 372:421, 1994.) From Science Frontiers #98, MAR-APR 1995 . 1995-2000 William R. Corliss ...

... here by the National Park Service reads: An unconformity "Rocks of the Ordovician and Silurian Periods are missing in Grand Canyon. Temple Butte Limestone of Devonian age occurs in scattered pockets. Redwall Limestone rests on these Devonian rocks or on Muav Limestone of much earlier Cambrian Age." This supposed unconformity is puzling for several reasons: The two limestone strata "seem" conformable in most places. Both are nicely horizontal, and there is basically no evidence that 200 million years of erosion and tectonic disturbances separate them. In some places, the two limestone strata intertongue or interfinger, such that by moving vertically one flashed back and forth in 200-million-year jumps. In both limestone strata, one finds layers of the same micaceous shale containing the same fossil tubeworms, suggesting near-simultaneous deposition. In one place, the two limestones clearly grade into one another, with no separation at all. Anyone who walks down the Canyon trails can see that the evidence for a 200-million-year hiatus between the Mississippian and Cambrian limestones is shaky at best. With the accuracy of geological dating through the use of contained fossils at risk, one would expect many professional papers dealing with this situation. Instead, the geological literature says little. One of the few papers mentioning the "unconformity" states that the contact between the two limestones displays ripples 2 feet from crest to trough, as one might expect with a true unconformity. Such ripples do not seem to exist. (Waisgerber, William, et al; "Mississippian and Cambrian Strata Interbedding: 200 Million Years Hiatus in ...

... lunar locales, particularly the huge craters Alphonso and Picard. Hundreds of such observations have accumulated since the Middle Ages. Modern more-systematic scrutiny indeed confirms that the moon is not such a dead place after all. (See ALF in The Moon and the Planets for much more on this fascinating subject.) Moonquakes, gaseous emissions, and even volcanic activity have been the favorite explanations of these TLPs (Transient Lunar Phenomena), but these are only surmises. The many close-up photos of the lunar surface taken in 1994 by the lunar satellite Clementine gave B. Buratti, K. Herkenhoff, and T. McConnochie the opportunity to search for geological common denominators connecting the sites where TLPs have been most frequent. The suspicious sites are characterized by bluish spectra that usually indicate unusually fresh deposits of lunar debris. Furthermore, these areas are usually found along the inside edges of large craters. Buratti et al opine that these are the sites of recent landslides that have cascaded off the crater edges. The dust and volatile gases released by these events might account for the observed luminous phenomena. (Cowen, Ron; "Explaining a Lunar Mystery," Science News, 150:314, 1996.) Reference. To order the book The Moon and the Planets (mentioned above), visit here . The lunar crater Gassendi on April 30 and May 1, 1966. The shaded areas mark the red glow observed on those dates by astronomers. From Science Frontiers #109, JAN-FEB 1997 . 1997-2000 William R. Corliss ...

... Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Blackened, broken stones of the middle east The current issue of Pursuit presents an article by Z. Sitchin in which he expounds his theory about ancient conflicts between gods and men. As evidence of this supposed strife, he reproduced a photograph of a plain in the Sinai Peninsula. Basically white limestone, the plain is thickly strewn with blackish, angular stones. Whence these immense quantities of incongruous stones? Sitchin proposes that they were created when an ancient spaceport was destroyed! (Sitchin, Zecharia; "The Wars of Gods and Men," Pursuit, 18:106, 1985.) Comment. Whatever one thinks of Sitchin's theory, the stones remain and must be accounted for. They are not the only such deposits in the Middle East. Velikovsky, in his Earth in Upheaval, states that 28 such rock fields are found in Arabia, some with areas of 6 or 7 thousand square miles. These are the "harras." Velikovsky thinks they are meteoric debris! Are there other explanations around? Reference. The blackened stones are just one variety of anomalous superficial aggregation of surface rocks. For more, see ESM1 in Neglected Geological Anomalies. Details here . From Science Frontiers #46, JUL-AUG 1986 . 1986-2000 William R. Corliss ...

... Project Sourcebook Subjects Flotsam On The Great Sand Sea One of the strangest mysteries nestled among the giant dunes of the Egyptian Sahara was not recognized by modern scientists until 1932. In December of that year, P. Clayton, a surveyor for the Egyptian Geological Survey, was driving among the dunes near the Saad Plateau when he heard his tires crunch on something that wasn't sand. It turned out to be large pieces of marvelously clear yellow-green glass -- not just any glass but ultra-pure glass, 98% silica. As often the case, Clayton was not the first to come across the now-famous Libyan Desert Glass or LDG. Prehistoric humans had made knives and other sharp-edged tools from it; the ancient Egyptians had carved a scarab from LDG and deposited it in Tutankhamen's tomb. But Clayton and the ancients did not recognize the scientific implications of their discovery. LDG is the purest natural silica glass ever found. Over a thousand tons of it are strewn across hundreds of kilometers of bleak desert. Some of the chunks weigh 26 kilograms, but most LDG exists in smaller, angular pieces looking like shards left when a giant green bottle was smashed by colossal forces. Pure as it is, LDG does contain tiny bubbles, white wisps, and inky black swirls. The whitish inclusions consist of refractory minerals, such as cristobalite. The ink-like swirls, though, are rich in iridium, which is diagnostic of an extraterrestrial impact -- meteorite or comet. The iridium leads to the heart of the LDG problem: Where ...

... probably triggered by the sudden decomposition of great masses of methane hydrate. Seismic probes of the ocean sediments reveal chaotic zones suggesting a violent event. (Kerr, Richard A.; "A Smoking Gun for an Ancient Methane Discharge," Science, 286:1465, 1999. Monastersky, R.; "Global Burp Gassed Ancient Earth," Science News, 156:260, 1999.) Philosophical observation. Just as natural fires of grasslands and forests eventually lead to vigorous new growth, it appears that methane (a natural product of the decomposition of organic material) also sweeps out old species and replaces them with new ones. No doubt this planetary cleansing is another ramification of the Gaia Hypothesis. Be advised that Gala still lives, and that huge, unstable, methane-hydrate deposits still lie buried under many continental shelves. 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, JFK, MI5, NSA, etc) Homeworking.com . Free resource for people thinking about working at home. ABC dating and personals . For people looking for relationships. Place your ad free. ...

... Science Frontiers ONLINE No. 131: SEP-OCT 2000 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Female Feral Fowl Foil Rapists Male animals possess an inspired arsenal of devices to ensure that their sperm are the ones that fertilize chosen females. Their mechanical devices range from scrapers that physically remove sperm deposited by competing males to plugs that block sperm access in subsequent matings. It is claimed that some male ejaculates introduce not only fertilizing sperm but also "kamikaze" sperm specially designed to hunt down and destroy competing sperm. Well, both sexes can play these games. Some females have ways to eject sperm from undesired males. For example, female feral fowl (hens gone wild!) prefer to mate with dominant males. Often, however, subdominant males force themselves on the females despite resistance and stress calls. The female response to such rapes is differential sperm ejection; that is, they immediately expel the unwanted ejaculate -- at least most of it -- raising the probability that they will be fertilized by the preferred dominant males. (Pizzeria, T., and Birkhead, T.R .; "Female Feral Fowl Eject Sperm of Sub-dominant Males," Nature, 405:787, 2000.) Comment. An interesting sort of sperm ejection occurs among Dunnocks, small brown birds common in English gardens. Alpha males try to prevent matings by lower-ranking males but are rarely successful. Most Dunnock matings are preceded by a ritual-like phenomenon called "cloaca-pecking." The female raises her ...

... 's strange Sand Hills. These Sand Hills stretch for thousands of square miles, reach heights of 400 feet, and are believed to be of aeolian origin during the Pleistocene. (See ETM7 in Carolina Bays ) Being a modern analog of the ancient Gobi, the Nebraska Sand Hills might provide some insights as to what happened long ago in the Gobi. An important clue occurs during the summer, when heavy thunderstorms sometimes trigger avalanches of wet sand called "debris flows". These sandslides may be 900 feet long, 50 feet wide, and 4 feet deep. Although they have occasionally partly buried ranch buildings, they are too slow and small to endangerlivestock and wild animals. But what if they were much larger and faster? Back on the Gobi, geologists remarked that the rich fossil deposits were found in structureless sandstone; i.e ., there was none of the cross-bedding seen in sandstones elsewhere in the region. Furthermore, fossils were extremely rare in the cross-bedded sandstones, which were built up over long periods of time. It looked as if the structureless, fossiliferous sandstones were sandslides differing from those in Nebraska in their much greater magnitude. But why were the Gobi sandslides so much larger and, apparently, faster? The next clue came from the recent devastating mudflows in California and Central America caused by heavy rains. These debris flows were made deadly when the infiltrating rainwater was blocked by bedrock. The accumulating water turned the soil into a muddy slurries that raced down hills at high velocities, overtaking animals (including many people) trying to escape ...

... Science Frontiers ONLINE No. 86: Mar-Apr 1993 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects How A Fly Hears What A Cricket Hears As we all know, male crickets chirp long and loud for mates from spring until fall. That many males are successful in attracting females is obvious from this insect's population levels. Some of the singing males, however, attract parasitic flies that home in on their songs and deposit their maggots on or near them. Within 10 days, these singers are silent -- they have been consumed by the maggots. The really interesting part of this tale involves the hearing organs of the crickets and flies. Normally, they are radically different in design and frequency of operation. Crickets usually sing at frequencies above 3 kilohertz, and their ears are attuned to these high frequencies. The usual fly, on the other hand, hums and buzzes at only 100-500 hertz (cycles per second). Their ears are duly optimized at these frequencies. The cricket-hunting flies (genus Ormia ), however, would starve to death if they couldn't hear the highpitched cricket songs. Their response was to "evolve" a cricket-type ear so they could home in on their prey. This is a remarkable example of evolutionary convergence. (Robert, Daniel, et al; "The Evolutionary Convergence of Hearing in a Parasitoid Fly and Its Cricket Host," Science, 258:1135, 1992.) Comment. How did the parasitic flies survive until they evolved ...

... jointing of the "wall" to neatly hexagonal prisms seen in many basalt flows. He supplied two photographs of the "wall." One was like the photo in SF#107 and showed regular joints; the second, from the same outcrop, displayed angled fractures and joints that certainly do not look like the work of humans. (Andrews, Philip; "New Zealand: Recent Ash, Ancient Wall," Geology Today , p. 136, July-August 1996. Cr. R.E . Molnar) Comments. If we receive counter-arguments from proponents of the wall's artificiality, we will add them to this dossier. A similar situation occurs with the more-famous Bimini "walls" or "roads." We have personally seen beach-rock deposits so regularly jointed that they seem man-made. From Science Frontiers #110, MAR-APR 1997 . 1997-2000 William R. Corliss ...

... Science Frontiers ONLINE No. 35: Sep-Oct 1984 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Confusing Seismic Data From The Deep Continental Crust Seismic exploration of the deep continental crust seems to indicate that huge sheets of crystalline rock have been pushed over sedimentary strata. The crystalline sheets, perhaps kilometers in thickness, were forcibly shoved hundreds of kilometers over sedimentary deposits during continental collisions -- so the theory goes. One such crystalline sheet is under the Southern Appalachians. Seismic data say it is about 10 kilometers thick and was pushed westward some 225 kilometers. If it seems intuitively impossible for such a thin sheet to remain intact during 225kilometers of shoving over other rocks, consider a similar sheet in the Basin and Range province of Utah. This sheet was pulled down an inclined fault without coming apart! These sliding sheets with remarkable structural integrities are required to explain what geophysicists see in the seismic reflections; namely, transparent zones of crystalline rock sitting on top of rocks that return strong reflections typical of layered sedimentary strata. However, one such situation in Arizona was explored with a drill bit. When the upper crystalline layer was penetrated, the drill found only more crystalline rocks, nothing sedimentary. In fact, the crystalline rock was not layered and was homogeneous. Thus, the source of the misleading seismic reflections is unknown. (Kerr, Richard A.; "Continental Drilling Heading Deeper," Science, 224:1418, 1984. Also: Anonymous; "Probing the Deep Con-tinental Crust," Science, 225: ...