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

将在坎帕尼亚黑鹰组和塞戈组的三个层段测试边缘海相有孔虫作为层序边界标准的效用。样品将从已知的边缘海相、与切谷事件有关的已知层序边界和疑似层序边界中收集。有孔虫组合将通过动物丰度、浮游/底栖比、凝集/钙质比和物种多样性来分析。沿可疑层序边界的边缘海相沉积的面积范围将有助于预测在岩心或露头遇到这种层序的可能性。

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.