The Bug Creek Problem and the Cretaceous-Tertiary Transition at McGuire Creek, Montana PDF Download

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The Bug Creek Problem and the Cretaceous-Tertiary Transition at McGuire Creek, Montana

The Bug Creek Problem and the Cretaceous-Tertiary Transition at McGuire Creek, Montana PDF Author: Donald L. Lofgren
Publisher: Univ of California Press
ISBN: 9780520915794
Category : Science
Languages : en
Pages : 204

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Book Description
Bug Creek assemblages from Montana, transitional in composition between typical Cretaceous and Paleocene vertebrate faunas, are critical to K-T extinction debates because they have been used to support both gradual and catastrophic K-T extinction scenarios. Geological and palynological data from McGuire Creek indicate that Bug Creek assemblages are Paleocene and restricted to channel fills entrenched into older sediments, suggesting that the Cretaceous component of the assemblage was reworked. Thus, the author concludes, "Paleocene dinosaurs" are an illusion and the K-T survival rate of mammals is low because the presence of Cretaceous mammals in Bug Creek assemblages is also the result of reworking.