Cretaceous–Tertiary extinction event - Wikipedia, the free encyclopedia
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The Cretaceous–Tertiary extinction event , which occurred approximately million years ago (Ma), was a large-scale mass extinction of animal and plant species in a geologically short period of time...
en.wikipedia.org/wiki/Cretaceous–Tertiary_extinction_ev...
en.wikipedia.org/wiki/Cretaceous–Tertiary_extinction_event
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One of the first rigorous statistical tests of the abrupt extinction in larger animals is of ammonites (extinct relatives of the squid with coiled shells) ...
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www.pnas.org/content/95/19/11028.full
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FIG. 9: Various Illustrations; Extinction; So why did such a successful creature become extinct? This is another question without an easy answer. The last ammonite families disappeared at the end of the Cretaceous period along with the dinosaurs 65 million years ago;
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www.tonmo.com/science/public/ammonites.php
www.tonmo.com/science/public/ammonites.php
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1988a, Ammonite extinction and the "Cretaceous-Tertiary Boundary Event," in Wiedmann, J., and Kullmann, J., Cephalopods, past and present: Stuttgart, ...
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geology.geoscienceworld.org/cgi/reprint/19/12/1181.pdf
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New collections of ammonites and inoceramid bivalves from five localities show quite distinct extinction patterns for these two groups of characteristic Cretaceous molluscs: from eight to ten ammonite species extend into the latest Cretaceous, and possibly to the boundary.
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geology.geoscienceworld.org/cgi/content/abstract/19/12/...
geology.geoscienceworld.org/cgi/content/abstract/19/12/1181
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Ammonite extinction is equally complicated [Marshall, 1996], but consistent with some gradual extinction well before KT and sudden extinction of most ...
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www.stecf.org/~ralbrech/amico/intabs/smitj.html
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Ammolite, mineral composition, myths, history ... The mollusk ammonite became extinct more than 70 million years ago. When the fossil ammonite becomes opalized it is called Ammolite. Rare, gem -quality ammolite appears similar to black opal, showing different color combinations when the stone is viewed from different angles.
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www.designjewel.com/ammolite4.htm
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That is, a significantly high number of ammonites were missing from the very last layer. Marshall and Ward discuss two possible explanations: either all 22 ammonites were present, but some had become quite rare by the end of the Cretaceous, or, there was an ammonite extinction before the K-T mass extinction.
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wps.prenhall.com/esm_freeman_evol_3/12/3320/850163.cw/i...
wps.prenhall.com/esm_freeman_evol_3/12/3320/850163.cw/index.html
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Use ammonite in a Sentence ... See web results for ammonite ... See images of ammonite...
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dictionary.reference.com/browse/ammonite
dictionary.reference.com/browse/ammonite
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