Utilization of Marginal Marine Foraminiferal Assemblages in Sequence Stratigraphy: Criteria for Sequence Boundary Recognition, Cretaceous Western Interior, U.S.A.

边缘海洋有孔虫作为 将测试层序边界，在三个间隔中， 坎帕尼亚黑鹰和塞戈编队。 采集样品 从已知的边缘海相，已知的层序界面 与下切谷事件有关， 边界 有孔虫组合将通过动物群丰度进行分析， 浮游生物/底栖生物比率、凝集生物/钙质比率，以及 物种多样性 沿沿着边缘海相沉积的面积范围 一个可疑的层序边界将有助于预测 在岩芯或露头中遇到这样的间隔。

Utility of marginal marine foraminifera as criteria for sequence boundaries will be tested, in three intervals in the Campanian Blackhawk and Sego formations. Samples will be collected from known marginal marine facies, a known sequence boundary related to an incised valley event, and a suspected sequence boundary. Foram assemblages will be analyzed by faunal abundance, planktonic/ benthonic ratios, agglutinated/calcareous ratios, and species diversity. Areal extent of marginal marine deposits along a suspected sequence boundary will help predict likelihood of encountering such an interval in a core or outcrop.