High-resolution calcareous nannofossil biostratigraphy of the Santonian/Campanian Stage boundary, Western Interior Basin, USA
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- 作者：Zachary A. Kitaa ; zkita@huskers.unl.edu" class="auth_mail" title="E-mail the corresponding author ; David K. Watkinsa ; Bradley B. Sagemanb
- 关键词：Calcareous nannofossils ; Biostratigraphy ; Niobrara Formation ; Santonian/Campanian Stage boundary ; Western Interior Basin
- 刊名：Cretaceous Research
- 出版年：2017
- 出版时间：January 2017
- 年：2017
- 卷：69
- 期：Complete
- 页码：49-55
- 全文大小：1474 K
文摘
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We analyze calcareous nannofossils in the Late Cretaceous Niobrara Formation of the Western Interior Seaway.
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Base of the Campanian lies between the last occurrences of Helicolithus trabeculatus >7 μm and Zeugrhabdotus biperforatus
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The base of the Scaphites leei III ammonite Zone appears to be slightly younger than the base of paleomagnetic chron C33r.