This is a preview. Log in through your library . Abstract The Lakadong Limestone comprises the lowermost unit of the Sylhet Limestone Group which represents a major marine transgression during the ...

Proceedings of the National Academy of Sciences of the United States of America, Vol. 105, No. 10 (Mar. 11, 2008), pp. 3815-3818 (4 pages) Undoubted primates first appear almost synchronously in the ...

The evolutionary journey from primitive plesiadapiforms to early primates during the Paleocene and Eocene epochs represents a critical chapter in mammalian history. Fossil records from these periods ...

Mammals have the largest brain to body size ratio among vertebrates, but how did this unprecedented encephalization emerge during their evolution? A new study by Ornella Bertrand and colleagues ...

A study of boron/calcium ratios in the shells of marine plankton suggests that the Paleocene-Eocene Thermal Maximum, a rapid global warming and ocean acidification event 55.6 million years ago that ...

When an asteroid slammed the Yucatán Peninsula 66 million years ago, it was bad news for dinosaurs — and about 75 percent of plant and animal life on the planet. This event marks the ...