On several occasions at impact geology- and paleontology-related meetings during the past 10 years, I have heard the statement from colleagues that major extinctions must be linked to large asteroid or comet impact events because “what else could it be?” (i.e., what other known mechanisms, terrestrial or extraterrestrial, could drive the geologically rapid loss of a majority of Earth's species?) Although I am strongly pro-impact in my view of Earth history, I think that it is time to reappraise our state of knowledge within impact geology and mass-extinction research, and to examine the widely postulated link between impacts and mass...

First Page Preview

First page PDF preview
You do not currently have access to this article.