About 66 million years ago – perhaps on a downright unlucky day in May – an asteroid smashed into our planet. The fallout was immediate and severe. Evidence shows that about 70% of species went ...

Bivalves have pursued an infaunal lifestyle since early in their history. Trace fossils that have been attributed to the infaunal activity of bivalves include Hillichnus, Lockeia (=Pelecypodichnus), ...

The fossil record may not be perfect, but it passed a critical test with flying colors, according to a study by University of Chicago paleontologist Susan M. Kidwell that will be published in the Feb.

Every so often, life on Earth steps onto a nearly empty playing field and faces a spectacular opportunity. Something major changes—in the atmosphere or in the oceans, or in the organisms themselves ...

ALTHOUGH Wells 1 and Scrutton 2 suggested methods of studying fossils to determine probable changes in day length, few studies have followed these suggestions. We have examined fossil bivalve shells ...

Stewart Edie receives funding from the Smithsonian Institution. Even groups that weathered the catastrophe, such as mammals, fishes and flowering plants, suffered severe population declines and ...