Plant microfossil record of the terminal Cretaceous event in the western United States and Canada
Plant microfossil record of the terminal Cretaceous event in the western United States and Canada
复制标题
美国西部和加拿大白垩纪末期事件的植物微化石记录
DOI：
10.1130/spe247-p445
复制
发表时间：
1990
影响因子：
11.1
通讯作者：
R. Fleming
中科院分区：
文献类型：
--
作者：
Douglas J. Nichols;R. Fleming
植物微体化石，主要是由陆地植物产生的花粉粒和孢子，提供了非海洋环境中白垩纪末期事件的良好记录。这些记录表明，白垩纪晚期的植被遭到了区域性破坏，许多植物群灭绝，随后是第三纪最早期陆地表面的退化，并形成了永久性变化的陆地植物群。沉积环境，植物群落和古气候的区域变化提供了对事件的性质和影响的深入了解，这些事件短暂但意义深远。植物微体化石数据支持这样一种假设，即白垩纪末发生了一场突然开始的重大生态危机。晚白垩世植物群的破坏最终促成了现代植被的兴起。植物微体化石与地球化学和矿物学数据相一致，外星人的影响是白垩纪末事件的原因。
Plant microfossils, principally pollen grains and spores produced by land plants, provide an excellent record of the terminal Cretaceous event in nonmarine environments. The record indicates regional devastation of the latest Cretaceous vegetation with the extinction of many groups, followed by a recolonization of the earliest Tertiary land surface, and development of a permanently changed land flora. The regional variations in depositional environments, plant communities, and paleoclimates provide insight into the nature and effects of the event, which were short-lived but profound. The plant microfossil data support the hypothesis that an abruptly initiated, major ecological crisis occurred at the end of the Cretaceous. Disruption of the Late Cretaceous flora ultimately contributred to the rise of modern vegetation. The plant microfossils together with geochemical and mineralogical data are consistent with an extraterrestrial impact having been the cause of the terminal Cretaceous event.