Looking at places of geologic change between the dinosaur-bearing formation and Paleocene-mammal-bearing formations, Dr. Weaver took samples of a fine line of red clay about a centimetre in width. He ...

This report provides an assessment of both the demonstrated and underdeveloped potential of the deep-time geologic record to inform us about the dynamics of the global climate system. The report ...

Dinosaurs were "ecosystem engineers," preventing dense forests from growing. Their sudden demise led to widescale ecological changes, according to a University of Michigan study, as represented here ...