The Bug Creek Problem and the Cretaceous-Tertiary Transition at McGuire Creek, Montana 在线电子书 pdf 下载 txt下载 epub 下载 mobi 下载 2024


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

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Lofgren, Donald L. 作者
译者
2001-8 出版日期
200 页数
$ 50.85 价格
丛书系列
9780520098008 图书编码

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The Bug Creek Problem and the Cretaceous-Tertiary Transition at McGuire Creek, Montana 在线电子书 epub 下载 mobi 下载 pdf 下载 txt 下载 2024

The Bug Creek Problem and the Cretaceous-Tertiary Transition at McGuire Creek, Montana 在线电子书 pdf 下载 txt下载 epub 下载 mobi 下载 2024



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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.

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