Contact: Steve Koppes
University of Chicago
Caption: This petri dish contains fossil graptolites, a group of long-extinct plankton. These particular colonies belong to the diplograptine species Geniculograptus typicalis, and floated in a shallow ocean that covered Ohio about 449 million years ago. “We don’t know much about their ecology, but their fossil record is extremely detailed,” said UChicago’s David Bapst.
Credit: Lloyd DeGrane
Usage Restrictions: News organizations may use this image in connection with reports about the research of Charles Mitchell and David Bapst.
Related news release: Explosive evolution need not follow mass extinctions, study of ancient zooplankton finds