... . (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 on the earth but rather on the moon. A lunar impact would obviously not require a terrestrial crater, and earthly biota would be spared. The debate over the possible lunar origin of this tektite fall has been particularly bitter. Those interested should refer to: O'Keefe, John A.; "The Coming Revolution in Planetology," Eos, ...

... Science Frontiers ONLINE No. 100: Jul-Aug 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Anomalous phenomena associated with the 1908 tunguska event N.V . Vasilyev has prepared a lengthy review of the 1908 Tunguska "event," which is usually ascribed to a wayward comet or meteorite. Vasilyev's data is based upon 167 reports, mostly in Russian. They show once again that this was no ordinary impact event, as illustrated by the following observations: A "local" magnetic storm began about 6 minutes after the explosion (If that is what it really was.) and lasted for more than 4 hours. These magnetic perturbations resembled those following nuclear atmospheric explosions. The Tunguska object left no smoky trail like many fireballs, but rather irridescent bands that looked like a rainbow. Following the "explosion," at least part of the object continued on in the same direction but veered upwards. [Meteors sometimes skip out of the atmosphere on trajectories like this.] Although the Tunguska event occurred on June 30, 1908, optical anomalies appeared all across northern Europe as early as June 23. These included mesospheric, silvery clouds, very bright nights, colorful twilight afterglows [something like those following the Krakatoa eruption], and remarkably intense and long-lasting solar halos. Some of these effects persisted until late July. Neither craters nor meteoric debris have been discovered so far, despite assiduous searches. The explosion created a shock wave that leveled 2150 km2 of taiga and a flash that singed about 200 km2. ...

... Science Frontiers ONLINE No. 72: Nov-Dec 1990 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Impact Crater Beneath Lake Huron "With the help of magnetic sensors, scientists have detected a rimmed circular structure, 30 miles in diameter, more than a mile beneath the floor of Lake Huron. They believe the magnetic ring marks a buried crater -- blasted by a meteorite at least 500 million years ago." (Stolzenburg, W.; "Impact Crater May Lie beneath Lake Huron," Science News, 138:133, 1990.) Reference. Many other impact craters are cataloged in section ESC in our catalog: Carolina Bays, Mima Mounds. Details on this book here . From Science Frontiers #72, NOV-DEC 1990 . 1990-2000 William R. Corliss ...

... Science Frontiers ONLINE No. 110: Mar-Apr 1997 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Nannobacteria: life on a different scale Who ever heard of nannobacteria until those tiny, worm-like objects were photographed inside that putative Martian meteorite ALH 84001? It turns out that these very tiny cells (only 0.1 - 0.4 micrometers in diameter) are everywhere on earth, but it seems that virtually no one knows about them. The furor over ALH 84001 has underscored professional and public ignorance of nannobacteria. Some scientists have asserted that bacteria could never be as small as those "objects" seen in the greatly magnified photos of ALH 84001. This claim led R.L . Folk to fire off a letter to Science that began with these two sentences: "Enough! As one of the discoverers of mineralized nannobacteria on Earth*, I must come to their defense. They are so abundant in samples I have studied that I believe they may make up most of the Earth's biomass." Folk reports that nannobacteria are found just about everywhere: hot-spring waters, decaying leaves, even blood. Nannobacteria are key players in the earth's surface chemistry, precipitating a host of minerals and acting symbiotically to precipitate organic hard parts. (Folk, Robert; "In Defense of Nannobacteria," Science, 274:1288, 1996.) Comment. Ignorance of nannobacteria is not surprising. One needs a scanning electron microscope to see them. * See: Folk, R.L ...

... Science Frontiers ONLINE No. 80: Mar-Apr 1992 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Ancient greek pyramids? The great wooden well of kuckhoven Astronomy What fluid cut the styx? More evidence for galactic "shells" or "something else" The nullarbor lode Biology Cricket coordination Thousands of grebes fall from the skies Spider swordplay Archaea: the living ancestors of all life forms Life-creation from a different perspective Geology Possible chain of meteorite scars in argentina Dinosaur flatulence and climate changes The steens mountain conundrum Aerial bioluminescence Dead water Concentric, rotating luminous rings seen in sweden Anomalous optical events in the upper atmosphere Unidentified light Unclassified First cold-fusion bomb? When the chips are down ...

... 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 Recent Martian Rivers Erode Alba Patera Most of the Martian surface is thought to be more than 3.8 billion years old. This portion is densely cratered from a period pf heavy meteorite bombardment. It is also carved by many channels that are thought to have been cut in ancient times by flowing water, water which quickly escaped into space or combined chemically with Martian minerals. The present atmosphere of Mars, in consequence, contains little water vapor. But some of the Martian landscape, notably Alba Patera, raises questions about the above scenario. The anomalous characteristic of Alba Patera is its relative smoothness and scarcity of impact craters. This Martian real estate is believed to be 2 billion years younger than the rest of the planet. Even so, it, too, is marked by "fluvial" features that resemble stream beds. Question #1 . How did Alba Patera get smoothed out or "reworked"? In other words, what happened to the ancient craters that must have pocked its surface, as they do everywhere else? Question #2 . Where did the water come from to cut Alba Patera's stream beds if all of the Martian water disappeared 2 billion years earlier? One line of thought maintains that "fluvial" does not mean "pluvial," and that Martian water has come from below rather than as rain from the atmosphere. Both fluvial episodes, in this view, occurred when something caused the ...

... Science Frontiers ONLINE No. 50: Mar-Apr 1987 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Hardball for Keeps Connecticut "Boat" Cairn "High"-tech Farming At Tiahuanaco Astronomy The Cosmological Atlantis Mysterious Bright Arcs May Be the Largest Objects in the Universe Too Many Short-period Comets Quantized Galaxy Redshifts The Fossil Record and the Quantization of Life! Biology Whales and Seafloor Pits Strange Patterns in Another Oceanic Habitat Lunar Magnetic Mollusc Monarchs Slighted -- sorry! Did We Learn to Swim Before We Learned to Walk? How Cancers Fight Chemotherapy The Melanic Moth Myth Chain of Crevicular Habitats? Feathered Flights of Fancy Geology Why Are Antarctic Meteorites Different? More on the Soviet Plume Events Geophysics Sympathetic Lightning Ball Lightning Burns A Rayed Circle on A Shed Wall Magnetic Precursors of Large Storms On the Trail of the Fifth Force Psychology Do You Hear What I Hear? Mind-bending the Velocity Vectors of Marine Algae ...

... Science Frontiers ONLINE No. 125: Sep-Oct 1999 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology The power of a paradigm Pre-columbiana Astronomy Ice-covered lake on mars? Leonid luminosity puzzle Biology Trannies of the tiny Snail-trail tale Dr. internet Geology Fossil meteorites The ups and downs of plate tectonics Geophysics Two down-falls Two non-falls Psychology Our untapped talents Sorrat Physics 10 YEARS OF COLD FUSION Unclassified More nominative determinism ...

... Science Frontiers ONLINE No. 134: Mar-Apr 2001 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Water Signposts, Ritual Paths Incroyable? Astronomy Missing Martian Meteorites Speaking of ALH 84001 Missing Planets in Globular Clusters Biology Toppling-Penguin Theory Overturned Bigfoot Mile-High, But Light-Years from Acceptance What Sang First? Geology Plate Techtonics Subducted? I Must go Down to the Goo Again! Geophysics Weird Waterspout? Psychology Sleep-Work and Dream-Work ...

... Science Frontiers ONLINE No. 104: Mar-Apr 1996 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Reinventing the neandertals The pit-zodiacs Astronomy Men like gods The petrozavodsk phenomenon Biology It's "smothers" not "pods" Search-and-destroy sperm The magnetic mountain Geology A HOLLOW, TRIANGULAR ICICLE A METEORITIC EVENT LAYER IN ANTARCTIC ICE The whale-on-its-tail fossil An antarctic bone bed Geophysics Puzzling winds Ball lightning materializes in a sitting room Bright sparks erupt from beach Psychology An invisible information superhighway? ...

... Rocks and Sediments of Controverted Origins ESC10 Unusual Growth Structures ESC11 Possible Extraterrestrial Origin of Ocean Water ESC12 Chemical Anomalies of Lakes and Ground Water ESC13 Petroleum Anomalies ESC14 Coal Anomalies ESC15 Outgassing of Radon-222 ESC16 Methane Anomalies ESD DEPOSITS OF REMARKABLE SIZE ESD1 Bone Caves, Bone Caches,... ESD2 Bone Beds, Fish Beds,... ESD3 Sedimentary Deposits of Exceptional Volume ESD4 Historical Evidence for Large Scale Flooding ESD5 Recent Large Reductions of Polar Ice Cover ESD6 Giant Basalt Flows and Traps ESD7 Giant Accumulations of Oil ESD8 Giant Erratics and Megabreccias ESD9 Deposits of Great Areal Extent ESI INCLUSIONS ESI1 Inclusions in Crystals ESI2 Microdebris ESI3 Erratic Boulders, Stones, and Mineral Patches ESI4 Anomalous Amber Inclusions ESI5 Microfossil-Like Inclusions ESI6 Oil in Fossil Cavities ESI7 Carbon Dust on Fossil Plants ESI8 Great Rarity of Fossil Meteorites and Tektites ESI9 Stretched Pebbles ESM ANOMALOUS SUPERFICIAL GEOLOGICAL MATERIALS ESM1 Unusual Superficial Aggregations of Rocks ESM2 Strewn Fields of Natural Glasses ESM3 Tektite and Microtektite Paradoxes and Anomalies ESM4 Boulder Trains and Belts ESM5 Rock Glaciers, Block Fields,... ESM6 Elevated Erratics... ESM7 Anomalous Glacial Drift ESM8 Fluidized Debris Slides ESM9 Surging Glaciers ESM10 Driftless Enclaves within Glaciated Regions ESM11 Anomalous Rock Motion ESM12 Superficial Rocky Debris of Doubtful Provenance ESP ANOMALOUS PHYSICAL PHENOMENA IN GEOLOGY ESP1 Anomalous Radiohalos ESP2 Flexible Rocks ESP3 Unusually Colored Rocks ESP4 Noncrushing of Fossils in Sediment Compaction ESP5 Remarkable Polished Rocks ESP6 Ringing Rocks ESP7 Small-Scale Magnetic Anomalies ESP8 Frazil Ice, Anchor Ice,... ESP9 Long-Range Fine Structure In Strata ESP10 Jointing, Cleat, Crack Patterns ESP11 Shocked Mineral Grains at Geological Boundaries ESP12 Radiometric Dating ...

... . Astronomers, it seems, prefer different scenarios. C. Chyba and C. Sagan, in a major review article in Nature, see a two-fold problem: (1 ) identifying the source of the raw materials; and (2 ) identifying the source(s ) of energy required for the synthesis of complex organic chemicals. First, they point to the steady drizzle of tiny, organic-rich particles drifting down to earth from cometary debris. These particles, which even carry spacesynthesized amino acids down to the earth's surface, seem likely chemical precursors of life. However, the atmosphere is also a potential source of prebiotic chemicals -- providing energy sources are available. Chyba and Sagan suggest as sources: lightning, ultraviolet radiation, and the shock energy derived from meteorite/asteroid/comet impacts. Together these energy sources, especially ultraviolet light, might synthesize thousands of tons of complex organic compounds each year. (Chyba, Christopher, and Sagan, Carl; "Endogenous Production, Exogenous Delivery and Impact-Shock Synthesis of Organic Molecules: An Inventory for the Origins of Life," Nature, 355:125, 1992. Also: Henbest, Nigel; "Organic Molecules from Space Rained Down on Early Earth," New Scientist, 2. 27, January 25, 1992.) Comment. Little is said in either of the above articles about the nature of and impetus for that final elusive step from organic chemicals to the simplest life forms. Everyone assumes that it happened, but did it? One can always imagine a universe in which ...

... bombarded the planet early in its history. The models show that comets of moderate size would have slowed down enough during entry into the Earth's atmosphere for their organic component to survive the impact intact. .. .. . "The idea that comets supplied the Earth with the organic material needed to create life has been around for more than 20 years, but as often as some scientists have put forth the hypothesis, others have shot it down. "About 20% of comet nuclei are composed of organic matter, the rest ice and dust. Most of the organic component appears to be in a complex, polymerized form similar to kerogen, which is found in sedimentary rocks on Earth. From 4.33.7 billion years ago, during the period of heaviest bombardment by meteorites and comets, an estimated 1023 g of organic material would have been added to Earth by comet impacts had they made up 10% of the extraterrestrial flux. That is 1001000 times larger than most estimates of the photochemical production of the compounds over the same period." (Anonymous; "Comets and Life," Eos, no. 13, 1989.) Comment. Nowhere in the above article does one find the name of Fred Hoyle, whose ideas along these lines have been ridiculed for years. From Science Frontiers #63, MAY-JUN 1989 . 1989-2000 William R. Corliss ...

... be 100 feet in diameter of just a foot or two, and now we may have centimeter-sized expressions of plasmoid activity in the unexpected locale of the subway tunnel! Building upon these observations, it is not unreasonable to ask whether plasmoids (including plasma vortices) may not exist on larger scales, say, astronomical and geological. We are drawn to those strange swirl markings on the moon. These loop-like patterns are 1050 kilometers in size and are associated with strong magnetic anomalies. (See ALE5 in The Moon and the Planets.) And right here on earth we have the devastation of the Tunguska Event sans a gaping crater. And how about the shallow Carolina Bays, some of which are associated with magnetic anomalies? Could such phenomena be the handiwork of plasmoids rather than meteorites or comets? Plasmoids could also be involved in such phenomena as ball lightning, the cookie-cutter holes, and even spontaneous human combustion! Reference. For ordering information on The Moon and the Planets, visit: here . From Science Frontiers #76, JUL-AUG 1991 . 1991-2000 William R. Corliss ...

... stripes would seem to be too big to miss, but ground-based surveys see nothing obvious. Even more curious, infrared sensors on a US weather satellite also see the five stripes. As the Nullarbor Plain cools off at night, the stripes are found to be about 2 C cooler than the surrounding terrain. Could they be fault lines? Geologists have not found any in the area. (Anderson, Ian; "Satellite Spies Strange Stripes in the Desert," New Scientist, p. 10, September 3, 1994.) Comment. Are these stripes akin to the man-made Nazca lines etched upon Peru's high desert? Not likely; they are too big. Instead, we wonder whether they might be associated with the Nullarbor Plain's massive lode of meteorites. (SF#80) From Science Frontiers #96, NOV-DEC 1994 . 1994-2000 William R. Corliss ...

... possible that these dust congestion episodes were responsible for the abrupt climatic variations which occurred toward the end of the last Ice Age." Whence these interplanetary dust clouds? The author of this article ruled out terrestrial volcanism (an insufficient source of iridium) and encounters with asteroids and cometary tails (too infrequent to account for the long periods of high dust levels). Rather, the dust source may have been the same event that created the recently discovered dust ring between Mars and Jupiter, which is believed to be only a few tens of thousands of years old. The nature of the "event" is not specified. (LaViolette, Paul A.; "Evidence of High Cosmic Dust Concentrations in Late Pleistocene Polar Ice (20,000-14,000 Years BP)," Meteoritics, 20:545, 1985.) References. See our catalog volume The Sun and Solar System Debris for more on the flotsam and jetsam of outer space. This book is described here . Also see the following item on "icy meteors" which is also pertinent. From Science Frontiers #44, MAR-APR 1986 . 1986-2000 William R. Corliss ...

... than "micro" (for 10-6 ). The smallest recognized bacteria, Myco plasma , lack cell walls and fall in the size range 150-200 nanometers. Nanobes are much smaller: 20-150 nanometers. But are nanobes really alive? A drill core recently extracted from a stratum of sandstone 3 kilometers deep off the coast of Western Australia was found to be infected with miniscule filamentous structures. P. Uwins and her colleagues at the University of Queensland believe these structures (" nanobes") are alive. They appear to grow and have cell walls. But skeptics assert that some lifeless chemical structures also grow. Others suspect contamination of the sample as it was raised to the surface and handled. Published photos of the nanobes look very much like the structures in the Martian meteorite ALH84001, which are claimed to be fossilized extraterrestrial bacteria. (SF#116) (Dayton, Leigh; "Tiny Wonders," New Scientist, p. 13, March 27, 1999.) Comment. R.L . Folk claims that so-called "nannobacteria" (100-400 nanometers) are ubiquitous on the earth. Few biologists believe that life forms can be this small, and they opt for lifeless mineral structures instead. (SF#110) Do nanobes = nannobacteria? We don't know, but wish everyone would spell this prefix the same way! From Science Frontiers #123, MAY-JUN 1999 . 1999-2000 William R. Corliss ...

... expectation, and belief. Indeed, the correspondences are strong; and this fact leads to the sentence from the summary quoted above. (Winkelman, Michael; "Magic A Theoretical Reassessment," Current Anthropology, 23:37, 1982.) Comment. A conventional rationalistic scientist would, or should, react to Winkelman's paper by saying that: Magic is not based on psi, rather psi is magic and has no scientific basis. Winkelman, on the other hand, tacitly assumes the reality of telepathy, precognition, etc. The real issue, of course, is whether there really is an "order of the universe" beyond the ken of present-day science. The history of science shows that science has eventually accepted one impossible idea after another; viz., meteorites and hypnosis. Psi may not make the grade. Even if psi is real, it cannot become part of the scientific belief system until dogmas about the nature of life and man change. From Science Frontiers #21, MAY-JUN 1982 . 1982-2000 William R. Corliss ...

... Tower of Babel! Furthermore, no longer does the multiplicity of life forms spring from a single primordial cell but rather from a "common ancestral community of cells." Complicating the picture still further, many eukaryote genes are totally unlike those seen in the prokaryotes and archaea. They "seem to come from no-where." "Nowhere" might really be a fourth trunk supporting what is now seen as a confused tangle of vegetation. (Doolittle, W. Ford; "Uprooting the Tree of Life," Scientific American, 282:90, February 2000.) Comment. That "ancestral community of cells" could have been formed from more than one (nonsupernatural) creation and/or multiple infusions of life forms and/or biochemical templates conveyed to earth by comets and meteorites. In other words, the Tree of Life may also have had (or still has) extraterrestrial roots, making life truly a cosmic phenomenon. 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. ...

... Online All Issues This Issue Sourcebook Project Sourcebook Subjects Terrestrial Life Older Than Expected The oldest fossils found so far are dated at 3.5 billion years ago. Discovered in Australia, these life forms seem to have been capable of synthesizing their own food, much like present-day plants. In other words, these life forms were not so primitive after all. If we are to assume that still simpler life and pre-life chemical evolution preceded these fossils, the advent of life on earth must be pushed back much farther to allow time for gestation. (Anonymous; "Oldest Life-Forms May Have Made Own Food," Eos, 61:578, 1980.) Comment. Another possibility is that life did not originate on earth and was instead brought here on comets, meteorites, etc. From Science Frontiers #13, Winter 1981 . 1981-2000 William R. Corliss ...

... strongly favors a terrestrial origin, with meteor impacts serving as the liquefying and splashing agents. Indeed, specific craters have long been associated with the European and African strew fields. Those who believe that the tektites were splashed all the way from the moon by meteor impacts have not given up yet. One provocative fact stressed in this article is that the ages of the four groups of tektites are 35, 14, 1.3 , and 0.7 million years. Tektites are all quite young! (Smith, Peter J.; "The Origin of Tektites -- Settled at Last?" Nature, 300: 217, 1982.) Comment. Were there no tektite-forming meteor impacts prior to 35 millions of years ago? Is this observation related to the great rarity of meteorites in sedimentary rocks? Just what is different about the past 35 million years? Reference. Twelve tektite "problems" are cataloged at ESM3: in Neglected Geological Anomalies. For more on this book, go to: here . From Science Frontiers #25, JAN-FEB 1983 . 1983-2000 William R. Corliss ...

... 10:30 in the morning we climbed to the top of the mountain in order to get a panorama of the surrounding country. We could see some areas that had been swept down by some great force, trees twisted off some 25 feet above the ground. We tried to enter one of these areas but the bush was in such a tangle that we had to give it up." (Ref. 3) Photographs accompanying the articles confirm some of the devastation. 1995. Northeastern Brazil. "Scientists in Brazil's northeastern state of Piaui are baffled by a crater that was punched into the tropical rain forest shortly after witnesses reported seeing a bright light streak across the sky. Researchers are uncertain whether the crater, 16 feet wide and 32 feet deep, was left by a meteorite or a piece of a comet. Physicist Paulo Frota of the University of Piaui believes it was caused by a block of ice from a comet because the surrounding vegetation is not burned and the crater's rim is not raised." (Ref. 4) References Ref. 1. Bailey, Mark E., et al; "The 1930 August 13 'Brazilian Tunguska' Event," Observatory, 115:250, 1995. Ref. 2. Chown, Marcus; "Did Falling Comet Cause Rumble in the Jungle?" New Scientist, p. 12, November 11, 1995. Ref. 3. Kroff, Serge A., et al; "Tornado or Meteor Crash?" The Sky, 3:8 , September 1939. Ref. 4. ...

... Oct 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Did the australites fall recently?Many thousands of australites, tektites strewn over Australia and Tasmania, have been found over the years; but, except for five, all were discovered loose on the surface or in unconsolidated sediments. Even the five australites found in rocks were in grit, sandstone, and other rocks that were hard to date and could have been recently lithified. Although the "official" date for the australite fall is 700,000 BP, the authors of this article, and presumably other Australian geologists, find "it difficult to believe that australites fell as long as 700,000 years ago." (Cleverly, W.H ., and Kirsch, Steve; Meteoritics, 19:91, 1984.) Comment. A few geologists even venture that this catastrophic event may have occurred just a few thousand years ago, and may be reflected in myth and legend. Reference. The "tektite age paradox" is covered more thoroughly in ESM3 in our catalog: Neglected Geological Anomalies. To order, visit: here . From Science Frontiers #41, SEP-OCT 1985 . 1985-2000 William R. Corliss ...

... atmosphere. A few less conservative people ventured that it was an alien spaceship that blew up! G. Longo and colleagues, Universita di Bologna, have apparently found a way to determine the true nature of this invading object. They examined the resin in the conifers surrounding the site of the blast to see if any particulate debris had been trapped in the sticky goo -- much as ancient insects have been preserved in amber. "Longo and associates used a scanning electron microscope to examine 7,163 particles recovered from the site and from two control sites. They found anomalously high abundances of elements such as iron, calcium, aluminum, copper, gold, zinc, and oxygen in the Tunguska-site samples, strongly peaking around 1908." Their conclusion: The impactor was a stony meteorite of normal density. (Anonymous; "Remnants of Tunguska," Astronomy, 23:26, October 1995.) From Science Frontiers #102 Nov-Dec 1995 . 1995-2000 William R. Corliss ...

... Science Frontiers ONLINE No. 121: Jan-Feb 1999 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Fused Ancient Garbage Dumps When a geologist discovers naturally formed glasses, he can explain them in several ways. When an archeologist finds the contents of ancient garbage dumps (" middens") fused into a glassy slag. he has to ponder a bit longer. First, a bit of background. Natural glasses can be created in several ways. Impact-heating by meteorites or asteroids probably fused the famous slabs of Libyan Desert Glass and also the Darwin glass found in Australia. More curious are the peculiar glassy clinkers of fused wood ash found in hollow snags in trees after intense forest fires. This is called "combustion metamorphism." Combustion metamorphism is also common where undergound coal seams have caught fire and burn for decades. Humans get into the act, too. The ancient Scots piled up trees around their rock forts and fused the stones together with fire. (Why they bothered is unknown.) However, a different sort of natural glass has been found in east-central Botswana. There, archeologists have found 5-inch-thick layers of glassy slag interleaved with ashy soil in ancient middens (garbage dumps). These middens are not associated with pottery kilns or iron smelting. It is hard to imagine what could have melted layers of garbage, including pottery, plant material, and other biomass. Analysis of the slag indicates that temperatures of 1155-1290 C were required to fuse the garbage. Open fires could ...