Publication Date:
1991-11-08
Description:
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 fades 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.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sheehan, P M -- Fastovsky, D E -- Hoffmann, R G -- Berghaus, C B -- Gabriel, D L -- New York, N.Y. -- Science. 1991 Nov 8;254(5033):835-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Geology, Milwaukee Public Museum, WI 53233, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11536489" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
*Biological Evolution
;
*Fossils
;
Geologic Sediments/*analysis
;
*Minor Planets
;
Montana
;
North Dakota
;
*Paleontology
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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