Gradual Dinosaur Extinction and Simultaneous Ungulate Radiation in the Hell Creek Formation

Details Gradual Dinosaur Extinction and Simultaneous Ungulate Radiation in the Hell Creek Formation Gradual Dinosaur Extinction and Simultaneous Ungulate Radiation in the Hell Creek Formation

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sci...232..629s&link_type=abstract

Science, Volume 232, Issue 4750, pp. 629-633

Computer Science

24

Scientific paper

Dinosaur extinction in Montana, Alberta, and Wyoming was a gradual process that began 7 million years before the end of the Cretaceous and accelerated rapidly in the final 0.3 million years of the Cretaceous, during the interval of apparent competition from rapidly evolving immigrating ungulates. This interval involves rapid reduction in both diversity and population density of dinosaurs. The last dinosaurs known are from a channel that contains teeth of Mantuan mammals, seven species of dinosaurs, and Paleocene pollen. The top of this channel is 1.3 meters above the likely position of the iridium anomaly, the Cretaceous/Tertiary boundary.

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