PBS has a new episode.  This one is about the dinosaurs of the east coast of North America.  North America was divided into two land masses by the Western Interior Seaway at the end of the Cretaceous about 100 to 66 million years ago.  The east coast landmass is called Appalachia. 

Where are all the east coast dinosaurs? Why don’t we find famous species like Triceratops in Central Park? Turns out, evolution and geology came together to make the east coast into an ancient lost world of weird dinosaurs.