Contact: Steve Koppes
University of Chicago
Caption: The fossil mollusks in this Maryland outcrop lived approximately 15 million years ago. UChicago paleontologists Andrew Z. Krug and David Jablonski analyzed the fossil record of mollusks for the last 200 million years, finding that mass extinctions don't just remove evolutionary lineages, they exert a long-term influence on evolutionary rates among the survivors.
Credit: Susan Kidwell
Usage Restrictions: News organizations may use this image in connection with reporters about the research of Andrew Krug and David Jablonski.
Related news release: Mass extinctions reset the long-term pace of evolution