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Search results for: dinosaur? in all categories
350 results found.
35 pages of results. 311. Reviews [Journals] [SIS Workshop]
... , operating through its production of sun-blocking aerosols, may have been an important variable." Stanley explains his reason for writing Extinction in these words: "Two controversial ideas have stimulated a recent surge of popular interest in mass extinctions. The first is the proposal that the impact of a giant meteor or comet triggered the crisis that ended the dinosaurs' reign. The second is the hypothesis that this and other crises have been spaced at regular intervals, owing to the operation of some periodic astronomical agent. Missing from the spate of popular accounts of these issues is any comprehensive evaluation of the record of great extinctions that is being read from rocks and fossils. Extinction is designed to ...
312. The Moon In Upheaval [Journals] [Velikovskian]
... course, quite in line with Velikovsky's hypothesis, in that both the Earth and the Moon in their tidal interactions with protoplanet Venus were tilted on their axes and had affected rotation, which changed the positions of their geographical poles and left similar alignments on both bodies. Firsoff stated: In the Tertiary [the period between the extinction of the dinosaurs and the present], Britain enjoyed a hot climate. Tropical animals and plants flourished. Then came great volcanic disturbances. The bowels of the Earth were convulsed, sea changed their boundaries, continents were engulfed and on the Moon, too, at the unspecified date of capture- last capture- proportionally even greater changes took place. The crust ...
313. The Stationary Period of the Satellites [Books]
... to shed a flood of really new light upon the puzzles and problems revealed by a close study of the fossils. Viewed from our new point of vantage, fossils found in great masses would not be proof of a time of teeming life, but rather evidence of a great and sudden death. The dramatic extinction of the mighty race of dinosaurs, which the Jurassic rocks reveal, is an inexplicable event no longer if regarded from the point of view of our Theory. If we accept the catastrophism of Hoerbiger's Cosmogonic Theory we can now also understand the reason why the saurians in the Jurassic Period, and other animals in other geological epochs, were apparently all entombed at the same ...
314. Solaria Binaria [Books] [de Grazia books]
... of the traits of the great god "Heaven" or "Uranus" to the first true humans, as will be detailed in the next chapter. The Moon was absent from the sky. The climate was equable and warm. The atmosphere contained oxygen and supported a nitrogen cycle. Most of the species of today existed. So did dinosaurs and nimble hominids. Ecological development proceeded according to uniformitarian principles of a competition for survival. But the extinction of a species was a rare event. So, too, was the birth of a species. As a condition gradually changed, so changed a ratio between and among species; a biological equilibrium was maintained, without abrupt interruption ...
315. The Cosmic Winter by Victor Clube and Bill Napier [Journals] [SIS Review]
... Taurids 10 days Zeta Perseids 15 days Arietids 20 days - suggesting that some of the relatively prolific showers mentioned above are rather older than the Beta Taurids. f). Many contrary theories are simply ignored. There is a vocal and long-running debate among the impact theorists and the volcanism theorists with regard to major extinctions, notably the terminal Cretaceous dinosaur extermination. Clube and Napier simply hijack the stronger points of each, and allow their impacts to cause the Deccan Traps volcanic episode associated with the extinction [84]. They should address the geological objections to this view [85]. The necessary hot plume in the mantle upwells, Courtillot reckons, from core to crust over a ...
316. Clockwork [Books] [de Grazia books]
... about and it was up to no good. When Chaos and Creation appeared, he sent a copy of it to the University of California physicist, Walter Alvarez, in appreciation of the study his team had published, exhibiting the existence of an iridium layer that might have fallen out from a meteoroid explosion, contributing to the demise of the dinosaurs. He took the occasion to ask "whether you remain convinced of the validity of radiometric dating, granted the possibility of catastrophic radiation and heavy subterranean heating." Alvarez replied, "In answer to your question: I consider radiometric dating to be an excellent tool that gives reliable dates. The systematics are well understood in all except ...
317. The Advancement of Science [Books] [de Grazia books]
... etc., and are signaled by terms such as "macroevolution," "punctuated equilibria," and so forth. These for the most part are anti-heretical and cling to their disciplinary centers as much as possible. Thus Walter Alvarez, who is himself under fire for a study showing the "iridium layer" marking an end to the dinosaurs in the rock strata is prompt to refer to Deg's work as "anti- scientific." He cannot have read Deg's work or any other considerable literature of the field; otherwise he must be using some narrow and antiquated definition of science, or worse, using the term science for name-calling. ** * It is widely believed ...
318. Forum [Journals] [SIS Review]
... & Napier use evidence from vulcanism to demonstrate atmospheric cooling caused by stratospheric ejecta; they state that impacts trigger vulcanism (as did Velikovsky) citing in particular the Deccan Traps eruptions at the close of the Cretaceous period. Maclean in America [28] and Courtillot in Europe [29] have suggested that all the K-T boundary effects (notably dinosaur extinction and iridium enhancement) may be accounted for by vulcanism alone; and that, moreover, the hot plume required to generate the volcanic effects is millions of years in the making, necessarily decoupling the Deccan event from any contemporary impact cause. They may be right, or they may be just sitting there with Canute. Similarly, ...
319. Ocean Basins [Books] [de Grazia books]
... turbidity current or two, and there you are. (Geophysicists and paleontologists can be catastrophists à la minute, when it is demanded of them.) Still, when there is a gap in the fossil record of between 50 to 70 millions of years ago, we are speaking of late Cretaceous times and of the disastrous end of the dinosaurs and most marine species. A layer of unfossilized chert tiles the floor just above this zone, "as though some catastrophic development killed off most of or much marine life." One begins to suspect that the Cretaceous boundary may be considered as the primeval age of the ocean beds and that all which is found in the abyss arrived ...
320. Opening the Floodgates [Journals] [SIS Workshop]
... at much the same time, and briefly considers controversies concerning a possible periodicity of extinctions (see C & C Review X, pp. 57-64). He reviews the Alvarez impact hypothesis for the mass extinctions at the end of the Cretaceous period, looking at iridium anomalies and other evidence, and discusses in some detail the demise of the dinosaurs at this time. Then he considers alternative hypotheses, both catastrophic and gradualistic, which have been advanced to account for mass extinctions. Eventually he finishes as Huggett begins, with a discussion of the confusion over terminology, arguing, "Thus the Lyellian maxim that the present is the key to the past requires qualification. No one questions ...
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