Sudden Extinction of the Dinosaurs: Latest Cretaceous, Upper Great Plains, U.S.A.

Details Sudden Extinction of the Dinosaurs: Latest Cretaceous, Upper Great Plains, U.S.A. Sudden Extinction of the Dinosaurs: Latest Cretaceous, Upper Great Plains, U.S.A.

Nov 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991sci...254..835s&link_type=abstract

Science, Volume 254, Issue 5033, pp. 835-839

Mathematics

Logic

12

Scientific paper

Results of a three-year field study of family-level patterns of ecological diversity of dinosaurs in the Hell Creek Formation of Montana and North Dakota show no evidence (probability P < 0.05) of a gradual decline of dinosaurs at the end of the Cretaceous. Stratigraphic reliability was maintained through a tripartite division of the Hell Creek, and preservational biases were corrected for by comparison of results only from similar facies as well as through the use of large-scale, statistically rigorous survey and collection procedures. The findings are in agreement with an abrupt extinction event such as one caused by an asteroid impact.

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