In the process of writing a post on bird evolution, it occurred to me that it might be helpful to re-post something I wrote a couple of years ago covering research reported by Paul Sereno about new fossil material from a theropod known as em>Aerosteon riocoloradensis</em>. When I went to look...
Fossils of a newly discovered species of dinosaur -- a 10-meter-long, elephant-weight predator -- were discovered in 1996 along the banks of Argentina's Rio Colorado, and are now being reported after a long period of careful study. This dinosaur dates to about 85 million years (which falls...