13 results found.
... Science Frontiers ONLINE No. 38: Mar-Apr 1985 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Galloping Glaciers North America boasts 104 surge glaciers. No one knows why these glaciers behave so differently from normal glaciers; they certainly look the same. But while ordinary glaciers creep along a few inches per day , surging glaciers will sometimes charge ahead at the rate of several yards per hour . The surges may be years apart; and they may occur periodically. The surges start high up on the glacier and propagate down to the foot, which plods along a few inches per day until the surge arrives. Then, it leaps forward, only to return to normality until the next periodic surge. The surges seem to occur when water spreads out under the ice, lubricating its flow. Beyond this we know little. Why do some glaciers surge while those right alongside behave normally? Are the surges really cyclic? The Variegated Glacier, in Alaska, for example, surged in 1906, probably in 1926, in 1947, in 1964-65, and in 1982 -- about 20 years between surges. The surges do not seem to be connected to earthquakes, climatic changes, volcanic heat, or anything obvious. (Beard, Jonathan; "Glaciers on the Run," Science 85, 6:84, February 1985.) From Science Frontiers #38, MAR-APR 1985 . 1985-2000 William R. Corliss ...
Terms matched: 1 - Score: 200 - 15 May 2017 - URL: /sf038/sf038p12.htm
... 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 Discordances ESP13 Natural Fission Reactors ESP14 Musical Sands ESP15 Luminous Rocks ESP16 Explosive Rocks ESP17 Dry Quicksand ESP18 Glacieres/Natural Refrigerators ESP19 Radioactive Fossils ESP20 Clustering of Mineralogical Dates in Time and Space ESP21 Random Cracking ...
Terms matched: 1 - Score: 37 - 15 May 2017 - URL: /cat-geol.htm
... Science Frontiers ONLINE No. 106: Jul-Aug 1996 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Stonehenge in the 1990s: a mainstream view In a recent number of Nature, C. Ruggles reviewed the present status of Stonehenge as mainstream archeologists now see this world-famous monument. oThe construction of Stonehenge began a bit earlier than previously thought: 2950 50 BC. But beneath the present parking area are post holes dated 4,000 years earlier! They are apparently not related to the Stonehenge we know. oThe idea that Stonehenge's bluestones, which originated in the Preseli Mountains of southwest Wales, 200 kilometers distant, were carried to Salisbury Plain by glaciers has been emphatically disproved by geologists. These 4-ton stones were transported by people! This great effort required precocious social organization, communication, and some kind of psychological impetus. oThe sarsens -- those even bigger stones that define Stonehenge in our mind's view -- evoke the same sorts of questions as this issue's eccentric flints: Why? and How? Ruggles writes: "Why it was important to bring stones from so far away is an open question, as is the issue of how people achieved the almost unimaginable feat of hauling the sarsens, weighing 25 tonnes or more, over 30 km from the Marlborough Downs in the north." oNew studies of the other ancient monuments in the vicinity of Stonehenge have revealed that they were not placed at random. Many are visible from Stonehenge. Stonehenge is at the center of a number of ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf106/sf106p01.htm
... 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 An Arkansas Tsunami Deposit?Yes, Arkansas is hundreds of kilometers from any ocean. Could a tsunami ever reach Little Rock, or even 120 kilometers northeast of Little Rock where, atop a 76-meter (250-foot) hill are perched giant blocks of sandstone. These blocks range up to 7.6 meters (25 feet) in size and weigh many tons. No native rocks in the area match them. The Ice Age glaciers never reached Arkansas, so they can't be glacial erratics. Where did they come from? One clue is the presence of glauconite in the sandstone. Glauconite is common in marine rocks, so suspicion points toward the Gulf of Mexico. Geologist G. Patterson, University of Memphis, thinks that the huge chunks of sandstone came from coastal Louisiana and were carried some 650 kilometers (400 miles) inland by the giant tsunami raised by the asteroid or comet that smashed into the Yucatan to close out the Cretaceous. That, of course, was when the dinosaurs were forced into oblivion. But could the tsunami really have transported such huge rocks 650 kilometers? (Falk, Dan; "Washed Up," New Scientist, p. 26, November 7, 1998.) Comments. Tsunami debris from the end-Cretaceous impact has been found along the Gulf Coast and on some Caribbean islands. In northeastern Mexico, geologists have found a debris layer 3-meters thick that ...
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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 The Andes Ice Islands High in the Bolivian Andes are some shallow, saltwater lakes. From some of these white-shored lakes rise bizarre "islands" of fresh-water ice, neatly layered horizontally, and up to 20 feet higher than the saltwater surface. The ice crystals comprising these islands are vertical, proving that they grew in water and are not pieces of glaciers. Clearly, they did not form from the present saltwater lakes, but they might be relics of the Ice Ages, when the lakes were deeper and fresher. But whence the nicely layered structure? Some scientists have thought that volcanic springs might be the sources of fresh water, but some ice islands occur in lakes where there are no volcanic springs nearby. At the moment, every-one seems stumped by these strange creations of Nature. (Anonymous; "Who Made the Andes Islands of Ice?" New Scientist, 96:272, 1982.) Comment. Could the ice islands be related to the Arctic pingoes -- those debris-covered ice hills? From Science Frontiers #25, JAN-FEB 1983 . 1983-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 38: Mar-Apr 1985 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Who Built the East Bay Walls? Ancient Engineering Feat Antarctica Revisited, Hapgood Acknowledged Astronomy Quasar, Quasar, Burning Bright; What Shifts Your Spectral Light? Unidentified Object Young Interplanetary Dust Neptune's Incomplete Ring Biology Whales and Dolphins Trapped Magnetically Listening with the Feet Life in the Dark Bad Year for Water Monsters Geology Galloping Glaciers Geophysics: The Sick Man of Science Geophysics Ball Lightning and Blue Flashes Green Cloud with Light Rays Still Another Mystery Cloud The Sounds That Shouldn't Have Been Expanding Phosphorescent Rings Two Snowflake Anomalies Psychology Hypnosis and Memory The Subtle Placebo ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf038/index.htm
... Science Frontiers ONLINE No. 84: Nov-Dec 1992 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects A Permian Polar Forest "An in situ Upper Permian fossil forest in the central Transantarctic Mountains near the Beardmore Glacier includes 15 permineralized trunks in growth position; the paleolatitude of the site was approximately 80 to 85 south. Numerous leaves of the seed fern Glossopteris are present in the shale in which the trunks are rooted. The trunks are perminealized and tree rings reveal that the forest was a rapidly growing and young forest, persisting in an equable, strongly seasonal climate -- a scenario that does not fit with some climate reconstructions for this time period." Some models of the Permian climate, based on astronomical and meteorological parameters, have winter temperatures at the site averaging -30 to -40 C, with the average summer temperature at merely 0 C. This fossil forest is clearly at odds with these models. (Taylor, Edith L., et al; "The Present Is Not the Key to the Past: A Polar Forest from the Permian of Antarctica," Science, 257:1675, 1992.) From Science Frontiers #84, NOV-DEC 1992 . 1992-2000 William R. Corliss ...
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... Science Frontiers ONLINE No. 16: Summer 1981 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects A MARTIAN ICE AGE?Long, sinuous depressions called "outflow channels" are concentrated in the equatorial regions of Mars. They clearly resemble terrestrial stream beds and have been attributed to water action. The ancient Spokane Flood that carved our Washington State's channeled scablands is seen as an apt terrestrial analogy. The Martian channels, however, are much larger than the water-eroded terrestrial analogs. The authors of the subject paper suggest that ice rather than water created the Martian channels, pointing out that terrestrial ice-stream and glacier landforms are much closer to the Martian features in terms of scale. (Lucchitta, Baerbel K., et al; "Did Ice Streams Carve Martian Outflow Channels?" Nature, 290:759, 1981.) Comment. This suggests the possibility that earth and Mars may have had synchronous Ice Ages due to solar variations or, perhaps, the envelopment of the entire solar system by a huge cloud of absorbing matter. From Science Frontiers #16, Summer 1981 . 1981-2000 William R. Corliss ...
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... of some ice shelves is considered to be the source of green icebergs. It [the green ice] most likely results from 'ice pump' processes which produce large amounts of ice platelets in the water column beneath ice shelves. These subsequently accumulate and become compacted into bubble-free, desalinated ice." The inclusions in the green ice are probably trapped by the accumulating platelets. Since the green ice is confined to the bottoms of the bergs, it becomes apparent only after the bergs capsize. The green icebergs in the Weddle Sea originate mainly from the Amery Ice Shelf. (Kipfstuhl, J. et al; "The Origin of Green Icebergs in Antarctica," Journal of Geophysical Research, 97:20,319, 1992.) Similar phenomenon. The ice calving from Alaskan glaciers is often a beautiful blue color -- the consequence of the ice's high density rather than inclusions. Alaskans export this ice to Japan where it is popular in drinks at tony parties!. From Science Frontiers #87, MAY-JUN 1993 . 1993-2000 William R. Corliss ...
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... few thousand years. To illustrate: "Rocks stacked in piles and balanced on their narrow ends on Yucca Mountain near the Nevada border with California, he said, have not moved in at least 10,000 years and perhaps as many as 100,000 years, judging from the depth of "rock varnish," or weathering, on their exposed surfaces." Looking for PBRs is not really as useless as it sounds, for they are indicators of stability to construction engineers planning nuclear waste disposal sites and similar projects requiring long-term seismic quiet. (Petit, Charles; "Seismologist Studies Precariously Balanced Rocks," San Francisco Chronicle, December 8, 1992. Cr. J. Covey) Comment. How do rocks become "precariously balanced" in the first place? Melting glaciers and snow packs are known to ease their cargos of rocky debris gently down into unstable configurations. From Science Frontiers #86, MAR-APR 1993 . 1993-2000 William R. Corliss ...
Terms matched: 1 - Score: 14 - 15 May 2017 - URL: /sf086/sf086g10.htm
... water comparable to that of the terrestrial oceans. We propose that the evaporation of this putative ocean may have yielded residual salt deposits that formed various terrain features depicted in Venera 15 and 16 radar images. "By analogy with models for the total evaporation of terrestrial oceans, evaporite deposits on Venus should be ar least ten to hundreds of meters thick. From photogeologic evidence and insitu chemical analyses, it appears that the salt plains were later buried by lava flows. On Earth, salt diapirism leads to the formation of salt domes, anticlines, and elongated salt intrusions -- features which have dimensions of roughly 1 to 100 km. Due to the rapid erosion of salt by water, surface evaporite landforms are only common in dry regions such as the Zagros Mountains of Iran, where salt plugs and glaciers exist. Venus is far drier than Iran; extruded salt should be preserved, although the high surface temperature (470 C) would probably stimulate rapid salt flow. Venus possesses a variety of circular landforms, ten to hundreds of kilometers wide, which could be either megasalt domes or salt intrusions colonizing impact craters. Additionally, arcuate bands seen in the Maxwell area of Venus could be salt intrusions formed in a region of tectonic stress. These large structures may not be salt features; nonetheless, salt features should exist on Venus." (Wood, C.A ., and Amsbury, D.; "Salt Structures on Venus," American Associa tion of Petroleum Geologists, Bulletin, 70:664, 1986.) Comment. Perhaps Venus had its "Salt Ages" just ...
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... Project Sourcebook Subjects Exotic Seismic Signals Not all terrestrial tremors emanate from buckling crust and slipping tectonic plates. The crashing of large waves on a seashore sends "microseisms" to sensitive instruments hundreds of kilometers away. The bubblings of Old Faithful geyser give rise to an enduring and engaging "harmonic tremor." As for the more "exotic" sources of seismic signals, they had an entire session devoted to them at the Fall 1996 meeting of the American Geophysical Union. Here are two of the unusual seismic events presented there. July 10, 1996. Yosemite National Park. "At 6:52 pm PDT Wednesday, July 10, 1996, a large block of granite, with an estimated mass of 80,000 to 184,000 tons, detached from the cliff between Washburn Point and Glacier Point, in Yosemite Valley. The rock mass subsequently launched from the cliff and free-fell ballistically an estimated 550 m before impacting approximately 30 meters from the base of the cliff in the Happy Isles area of the valley floor in Yosemite National Park...This rock fall was well recorded by 3 UC Berkeley (BDSN) and Caltech (TERRAscope) broadband seismographic stations and 15 shortperiod seismographic stations (operated by the USGS in Menlo Park and the University of Nevada, Reno). In fact, it is the largest vertical rock free-fall ever recorded seismically and it registered on seismographs up to 200 km distant." (Uhrhammer, R.A .; "Seismic Analysis of the Yosemite Rock Fall of July 10, 1996," Eos, 77:508, ...
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... 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, where tektites come from, whence the immense deposits of superficial debris all over our globe ? [Picture caption: Mace-shaped and sand-spike concretions from the Colorado delta] Typical subjects covered: Concretions and geodes * Tektites and microtektites * Erratic boulders and gravels * Polystrate fossils * Bone caves and bone beds * Giant basalt flows * Natural glasses * Surging glaciers * Driftless regions * Stretched pebbles * Crystal inclusions * Rarity of fossil meteorites and tektites * Elevated erratics * Stone rivers and rock glaciers 333 pages, hardcover, $18.95, 80 illustrations, 5 indexes 1990. 1030 references, LC 90-60568, ISBN 915554-24-0 , 7x10 format. Unknown Earth: A Handbook of Geological Enigmas Out of print Hardcover, 833 pages, January 1980, ISBN: 0-915554-06-2 Astronomy Catalogs For a full list of astronomy subjects, see here . The Moon and the Planets; A Catalog of Astronomical Anomalies Sorry: Out of Print. No longer available. From our own moon's cratered surface to the red, rock-strewn plains of Mars, the Solar System is a fertile field for ...
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