Thompson had investigated a previously almost unexplored region , where fossils proved to be plentiful and directly accessible on the surface .
Fossilized remains were discovered by geology student Richard Thompson , in November 1994 , in the Chihuahua Desert region of the Sonoran Desert in southern Arizona .
geology student had investigated a previously almost unexplored region , where fossils proved to be plentiful and directly accessible on the surface .
Fossilized remains were discovered by geology student Richard Thompson , in November 1994 , in the Chihuahua Desert region of the Sonoran Desert in southern Arizona .