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76 pages of results. 321. Monitor [Journals] [SIS Workshop]
... the growth of glaciers. Sea level should then drop and a possible ice age triggered. Cretaceous-Tertiary: Impact or Volcanism?Scientific American October 1990, pp. 44-60 All the arguments are carefully laid out in two major articles. Alvarez and Asaro think all the evidence points towards the impact of an asteroid or comet. Courtillot considers that mass extinctions occur when internal episodes of energetic mantle convection break through in the form of hot spots with initial vast outpourings of magma; in the case of the C-T boundary the Deccan Traps in India are the evidence. Triassic comet New Scientist 24.11.90, p. 25 The extinction event which ended the Triassic period was one of ...
322. Letters [Journals] [SIS Workshop]
... the arms of God" says one recent eyewitness)." My comments. 1. As well as acting as recording media, both aluminium powder and crop damp with dew would provide good conducting paths to earth'. 2. Presumably repulsion between negative charges on earth and shell causes the balls to hover'. The powder records the extinction of the plasma ball as it discharges to earth. Extinction might be caused by: a) The ball meeting a spike': the repulsion would be too localised to lift the ball up-and-over' the spike, which would penetrate shell and core (however, spikes in a tray of aluminium powder are unlikely). b) At ...
323. On the Nature of Natural Selection and Speciation [Journals] [Aeon]
... of interbreeding and producing fertile offspring. Sometimes two different species can cross, but either their offspring are infertile or they cannot breed true. They cannot perpetuate themselves and the line will die out. (There are exceptions, however.) Understandably, one cannot always conclusively identify species in the fossil record- most certainly in the case of extinct types. Paleospecies (fossilized or other remains) are necessarily identified solely on the basis of morphology (form). The precariousness of this can be appreciated by the consideration of such physically similar living species as horses and zebras (different species) and the great divergence of Great Danes and Chihuahuas (same species). Mutations It is ...
324. Thoth Vol I, No. 13: May 16, 1997 [Journals] [Thoth]
... Hutton and his legacy 2.5 Natural theology and diluvialism in early nineteenth century Britain 2.6 The catastrophism-uniformitarianism debate in the 1830s and beyond 2.7 Lamarck, Darwin and evolution 2.8 Towards a gradualistic evolutionary synthesis. 3. Gradualism under Challenge 3.1 From catastrophism to neocatastrophism 3.2 Eustasy, impacts and mass extinctions 3.3 Phyletic gradualism and quantum evolution 3.4 Punctuated equilibrium and species selection 3.5 Gould's view of life. 4. Nemesis for Evolutionary Gradualism? 4.1 Iridium, tektites and the death of the dinosaurs 4.2 Conflicting views about the K-T transition 4.3 A periodicity in extinctions? 4.4 ...
325. New Scenarios for Solar System Evolution [Journals] [SIS Internet Digest]
... where the highest mountain still keeps a similar name) one is able to locate the land of the Phaeacians, Scherie, in the southern coast of Norway (in the ancient Nordic language, "skerja" means "rock"). Forese Carlo Wezel, University of Urbino, Urbino, Italy: Biotic and Cultural Turning Points: Mass Extinctions, Innovations and Environmental Perturbations Geological evidence indicates that the physical nature of Earth is the product of the interaction of a number of independent key- variables, e.g . global geology, internal dynamics of the planet, climate, sea level and biosphere, with different relative importance. During the history of Earth each of these variables has ...
326. Monitor [Journals] [SIS Workshop]
... refute these with fossil evidence from this one locality. The usual uniformitarian assumptions were used, in which fossils were considered to be normal' deposits, and in which changes in types reflected large time spans. The decimation of the marsupials from 13 species to 1, whereas 19 of 31 mammalian species survived, was taken as evidence of selective extinction - a result of "relatively normal ecological changes, for catastrophic events would not have been so selective". By implication, this took marsupials to be inferior, a suggestion refuted by Stephen J. Gould (" What's wrong with marsupials" NEW SCIENTIST 2/10/80). Significantly, the time scales on which the ...
327. Darwinian Diary, part I (Book reviews) [Journals] [SIS Review]
... birds and reptiles. Its status is still disputed. As Francis Hitching points out (The Neck of the Giraffe), the characteristic tail structure (bottom right) of bone with attached feathers is often supposed to be a "reptilian" feature, yet is strikingly paralleled by that of modern swans. Hitching argues that Archaeopteryx was simply an extinct bird, and not a transitional reptile-bird form The first section (entitled Impasse) is a reasonably fair account of the problems currently facing Darwinism, but there are some errors. It is wrong to say "you can get more that one protein from the same DNA sequence", and when the author argues that Archaeopteryx is not an ...
328. Conclusion (Carl Sagan & Immanuel Velikovsky) [Books]
... meetings [withholding positions at universities for those who support Arp], distortion and misquotation of the written word, rewriting of history..."11 This begins to sound all too familiar. Against such venality what chance has any new idea? This is science today The view that a comet may have struck the Earth and caused the extinctions of the dinosaurs has also led to vilification all around. The New York Times reports; "The impact of a large comet may or may not have killed the dinosaurs 65 million years ago. But as the debate over dinosaur extinction rages on, personal rancor is increasingly clouding scientific issues. "Scientists on both sides of the argument ...
329. The Races Of Homo Sapiens [Journals] [Kronos]
... closely paralleled the beginning of the Upper Pleistocene in other parts- both following the Middle Pleistocene. The first appearance of the Ainu (Holocene) would then fit in with that of Caucasoids and Negroids (Upper Pleistocene). The drastic increase in ocean level must have been brought about by the Deluge. And here we find cause for numerous extinctions assigned to the beginning of the Holocene and the biological changes ascribed to the end of the Middle Pleistocene. Plant mutations at this time might have given rise to agricultural species such as maize. At the beginning of the Middle Pleistocene we also find extinctions and mutations, with Homo sapiens among the latter. The Golden Age is thus ascribed ...
... had been simple, there would have beenno difficulty in considering Sivatherium as simply a gigantic four-horned Antelope. . . . It is to the Miocene period that we must refer the first appearance of the important order of the Elephants and their allies {Proboscidians). . . . Only three generic groupsof this order are known, namely, the extinct Deinotilerium, the equally extinct Mastodons, and the Elephants; and all these three types are known to have been in existence as early as the Miocene period, the first of them being exclusively confined to deposits of this age. . . . The most celebrated skull of the Deinothere is the one which was exhumed from the Upper Miocene ...
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