Isotopic Tests of Survivorship or Reworking of Planktic Foraminifera across the Cretaceous-Tertiary Boundary of Low and Middle Latitudes

9406506 D‘Hondt Pi及其合作者将测试最后一次出现的晚白垩世浮游有孔虫是否主要是由于分类学上的残存或跨越白垩纪-第三纪(K-T)界线的沉积改造；主要测试技术将是对单一物种样品的碳同位素分析。更广泛的目标是确定这些最后发生的事件如何影响逐渐或灾难性的灭绝情景，以及K-T大规模灭绝的外生或内生原因。研究和结果还将涉及a)生存的地理变化，b)生存、生态策略和生产之间的关系，以及c)K-T边界的高分辨率生物地层学。***

9406506 D'Hondt PI and collaborators will test whether early Paleocene last occurrences of late Cretaceous planktic foraminifera primarily resulted from taxonomic survival or from sedimentary reworking across the Cretaceous-Tertiary (K-T) boundary; principal testing technique will be carbon-isotopic analyses of monospecific samples. Broader objectives are to determine how these last occurrences bear on gradual or catastrophic extinction scenarios, and on exogenous or endogenous causes of the K-T mass extinction. Study and results will also bear on a) geographic variation in survivorship, b) relation among survivorship, ecologic strategy, and production, and c) high-resolution biostratigraphy of the K-T boundary. ***