事件沉积与恐龙绝灭张玉宾迄今为止，有关恐龙等中生代古生物绝灭的假说有十多种，特别是自八十代初在中生界与新生界交界处发现富铱粘土层以来，灾变论的观点被越来越多的人所接受。但是，反对派引用大量证据，否认恐龙的绝灭与星球碰撞的灾变事件有关，指出在很多地方发... Event deposition and extinction of dinosaurs Zhang Yubin So far, there are dozens of hypotheses about the extinction of Mesozoic paleontology such as dinosaurs, especially since the early 80s when the iridium-rich clay layer was discovered at the junction of Mesozoic and Cenozoic. Opinion is accepted by more and more people. However, the opposition cited a large amount of evidence to deny that the extinction of dinosaurs was related to the catastrophic event of a planetary collision, pointing out that in many places ...