Disruption of the Terrestrial Plant Ecosystem at the Cretaceous-Tertiary Boundary, Western Interior
Disruption of the Terrestrial Plant Ecosystem at the Cretaceous-Tertiary Boundary, Western Interior
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DOI：
10.1126/science.225.4666.1030
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发表时间：
1984-09
期刊：
影响因子：
56.9
通讯作者：
R. H. Tschudy;C. L. Pillmore;Charles J. Orth;J. S. Gilmore;J. Knight
中科院分区：
文献类型：
--
作者：
R. H. Tschudy;C. L. Pillmore;Charles J. Orth;J. S. Gilmore;J. Knight
北美西部内陆白垩纪-第三系界线由孢粉学定义，位于富含Ir的粘土层的顶部。边界的特征是某些花粉物种突然消失，紧随其后的是蕨类孢子与被子植物花粉比例的显著、地质上的短暂变化。这些变化发生在两个相距甚远的地点，意味着陆地生态系统在整个大陆范围内受到破坏，可能是由该时期结束时的一次重大灾难性事件造成的。
The palynologically defined Cretaceous-Tertiary boundary in the western interior of North America occurs at the top of an iridium-rich clay layer. The boundary is characterized by the abrupt disappearance of certain pollen species, immediately followed by a pronounced, geologically brief change in the ratio of fern spores to angiosperm pollen. The occurrence of these changes at two widely separated sites implies continentwide disruption of the terrestrial ecosystem, probably caused by a major catastrophic event at the end of the period.