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53 pages of results.
... of extraterrestrial processes (particularly asteroidal and cometary impacts) has come to prominence as a potent evolutionary driving force. Sudden catastrophic events, such as meteor showers, may cause mass extinctions followed by rapid bursts of new species. To argue his case, Palmer starts the book by introducing the role of extraterrestrial events in Earth history and in the history of bodies ... or sudden events? what causes mass extinctions? Do mass extinctions take place slowly or swiftly? To answer this question, it is important to understand the nature of a mass extinction. A mass extinction is the net loss of unusually many species. It may arise through an increase in the extinction rate, which is what the fossil record suggests happens, ... in which tropical marine biotas, including stenothermal calcareous algae, declined greatly and reef communities were decimated [7, 8. The detailed pattern of late Cretaceous extinctions suggests a gradual extinction-rate increase for many groups of organisms, followed by a catastrophe lasting a few tens of thousands of years. In the sea, the extinction of planktonic foraminiferal species spanned 300, ...
Terms matched: 4  -  Score: 1956  -  05 Mar 2003  -  21k  -  URL:
... From: Catastrophist Geology Year 3 No. 1 (June 1978) Home¦ Issue Contents Some Additional References on Mass Extinctions and on Radioactivity (especially K-T) Johan B.Kloosterman Selected by Johan B.Kloosterman from several bibliographies, using as criterion only the titles. With thanks to Dale A.Russell, Llewellyn I.Price, Jacobus C.Gravesteyn and Manfred Warth. See also the previous ... . of CA, Pub/. in Geo/. Sci. 47:1-42. Axelrod D. I., Bailey H. P., 1968: Cretaceous Dinosaur extinction. Evolution 22/3:595-611. Bakker R. T., 1977: Tetrapod mass extinctions. In: Hallam A. (ad.): Patterns of Evolution ... . Luso-Amer. Geol. Econ., Madrid-Lisboa, 1/1141-155. Cys.l. M., 1967:The inability of dinosaurs to hibernate ass possible key factor to their extinction.J. Pal. 41/1:266. Dubinchuk V. T., Kochenov A. V., Penkov V. F., 1976: (Transformations in the ...
Terms matched: 3  -  Score: 1434  -  05 Mar 2003  -  14k  -  URL:
... Science Frontiers ONLINE No. 59: Sep-Oct 1988 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects PERIODIC EXTINCTIONS AND EXPLOSIONS IN TERRESTRIAL LIFE Claims of a 26-million-year periodicity in biological extinctions have been given wide publicity recently. One theory has it that periodic comet showers have created this regular pulse beat in the history of ... functional, physiological, and ecological lines." The plotters of these graphs, D. Raup and G. Boyajian, claim that whatever the mechanism, "major pulses of extinction result from geographically pervasive environmental disturbances." What besides powerful, external physical forces (read "comets and asteroids") could affect such wide ranges of marine organisms? ( ... alas, our atmosphere has also turned out to be a chaotic system, and long-term predictions are next to impossible. So, too, with life and its development. Those extinction-explosion plots may be just the paleontological expressions of a chaotic system. From Science Frontiers #59, SEP-OCT 1988.© 1988-2000 William R. Corliss Other Sites of Interest SIS. ...
Terms matched: 3  -  Score: 1239  -  29 Apr 2005  -  6k  -  URL:
... , as with the crash of a large body into the Earth. Such is quantavolution. It appears to be easier to discover death than new life. The literature on biological extinctions is getting heavier all the time, but little is forthcoming on genesis. We wonder why. Could it be a taboo against one kind of creation? Perhaps. Might it ... Quantavolution.Org E-MAIL: TABLE OF CONTENTS THE LATELY TORTURED EARTH: Part VI: Biospherics by Alfred de Grazia CHAPTER TWENTY-SEVEN GENESIS AND EXTINCTION Man is an exceptional creature, creative and destructive. He is a walking catastrophe for other kinds of life. Rashmi Mayur, in agitating for a "Kalotic World Order," projects that mankind will extirpate ... of the holocene period must ensue, absorbing time all the way back into the Cretaceous and up into the neolithic. But all those creatures exhibited may be pre-selenian, and were extincted, even the particular human race of the artist, around 12,000 B. P. Leaving this perplexing issue, we return to the problem of the ecological niches. ...
Terms matched: 3  -  Score: 1223  -  03 Apr 2004  -  54k  -  URL:
5. For the Record. . . [Kronos $]
... natural selection of small chance variations is the central fact in evolution.... Rapid adaptation is metamorphosis. By rapid adaptation to new environments some animals survived the repeated great extinctions that have periodically depopulated our globe. New species resulted. So it is that fossils found at the end of one epoch differ profoundly from those found at the beginning of the ... to explain the history of the earth. They agree, however, that these processes must have varied greatly in rate." Thus, Newell attempted to deny catastrophic authenticity regarding extinction and evolution by propounding the concept of "gradual catastrophes" or "varying uniformitarianism," once again demonstrating how science can squeeze or stretch pre-conceived notions into a procrustean bed of ... own design. Newell could not accept violent and sudden global upheaval, whether terrestrially or extraterrestrially induced, as an extinctive mechanism, even though he was acutely aware of certain problems involving the subject of extinction. "It is striking that times of widespread extinction generally affected many quite unrelated groups in separate habitats. The parallelism of extinction between some of the aquatic ...
Terms matched: 3  -  Score: 1164  -  05 Mar 2003  -  37k  -  URL:
6. More Doubts About Asteroids [Science Frontiers Website]
... 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 ... environment acting upon kerogenand pyrite-rich clay. In short, some geologists at least do not find the asteroid hypothesis compelling at the moment. (Hallam, Tony; "Asteroids and Extinction-- No Cause for Concern," New Scientist, p. 30, November 8, 1984.) From Science Frontiers #37, JAN-FEB 1985.© 1985-2000 William ... 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 ...
Terms matched: 3  -  Score: 1149  -  29 Apr 2005  -  6k  -  URL:
... . The mammoth and almost all other large animals of the same period were extincted between 5,000 and 30,000 years ago over the face of the globe. The extinctions occurred from over practically the whole arctic area and down to the southern part of the United States, Europe and Middle Asia, where their close relatives, the mastodon, now-extinct ... human and replaced it by methane, carbon dioxide, carbon monoxide or these together. We turn next to the famous case of the mammoths, not waiting for the chapter on extinction [6. One almost should say the "deathless" case, for it has endured the whole battle between catastrophists and uniformitarians, two hundred years -except that now it may ... and died where they were found, several still standing, one with a rooted tree buried with it. The mammoth and almost all other large animals of the same period were extincted between 5,000 and 30,000 years ago over the face of the globe. The extinctions occurred from over practically the whole arctic area and down to the southern part ...
Terms matched: 3  -  Score: 1148  -  03 Apr 2004  -  48k  -  URL:
8. Monitor [SIS C&C Workshop $]
... , however, the field is a fruitful one for a rigorous study. Cretaceous Catastrophe- 1 source: Nature 324, 13.11.86, p.112 There is now corroborative evidence of widespread extinctions of land plants at the Cretaceous-Tertiary boundary, something that has generally been overlooked in the obsession with dinosaurs and marine life. The terrestrial flora shows major turnover at the same time ... just how many more there are. It is similar in size and features to Manicouagan crater in Quebec, and dates from 136 Myrs ago, which is the Jurassic/Cretaceous extinction boundary. No high concentrations of the rare earth metals (iridium etc) have been found at/near such large craters, so if they were present they must have been ... being based on the depth of "sediments" at the boundary and immediately below it. The plant "evidence" has had to be revised recently- in favour of the extinction-event hypothesis- see above. Revised Dating source: New Scientist 14.5.87, p.34 A new technique of dating ancient limestone sediments by comparing the ratios of Pb isotopes has led to the ...
Terms matched: 3  -  Score: 1128  -  05 Mar 2003  -  30k  -  URL:
... line of mammals that may have evolved and extincted 30 million years earlier than accepted beginnings of present mammalia. (New Scientist). 15. The Eocene-Oligocene boundary is marked with extinctions, microtektites and high iridium levels of exoterrestrial event. (New Scientist). 16. Gravitational Constant may be changing, as applied to changing lunar orbit (Astrophy. J ... Earl Milton and me in the model of Solaria Binaria.) In 1970 the palentologist D. J. McLaren, in a presidential address to his colleagues, reviews the wholesale extinction of species at certain times, and then ventures that a heavy meteoroid explosion should be introduced by way of explanation. Following an explanation of the effects of what I have since ... ), so another "missing link" is gone. (New Scientist). 14. Jurassic find in China exhibits an earlier line of mammals that may have evolved and extincted 30 million years earlier than accepted beginnings of present mammalia. (New Scientist). 15. The Eocene-Oligocene boundary is marked with extinctions, microtektites and high iridium levels of exoterrestrial ...
Terms matched: 3  -  Score: 1120  -  03 Apr 2004  -  28k  -  URL:
... ," one can expect the Earth to exhibit hills and mountains, as of iron ore and erratic isolated hills, which are then surficial mascons. Concerning the "abrupt" extinction of Cretaceous life forms, Smit and Hertogen, like Alvarez and his associates, see in a general distribution of two trace elements, iridium and osmium, at this stratum of ... , and the oceans to the north, east, and south. Large tracts of land would be sunk and others elevated. Minerals would be formed, elements transmuted, species extincted and new forms created in the radiation storms. They assigned an axis tilt of 30 to the blow, shifting the north pole from near Akpatok Island, in the Hudson Strait ... of 60 and 180 kilometer diameters, in Yucatan. The anomalous magnetized rocks are about 1100 feet deep and assigned to Late Cretaceous which makes it, too, a candidate for extincting dinosaurs and decimating the biosphere. But other candidates can be named, for instance an astrobleme feature beneath the disturbed ice of Wilkes Land, Antarctica, to which Weihaupt ascribes hypothetically ...
Terms matched: 3  -  Score: 1116  -  03 Apr 2004  -  45k  -  URL:
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