This is a cast of juvenile Tyrannosaurus rex jaws/teeth found in Montana in 1966. Studies have shown that it was less than 3 years o...

The horned dinosaur (ceratopsian) Protoceratops andrewsi displayed at the Carnegie Museum of Natural History in Pittsburgh, Pennsylvania...

The Sphenodiscus lenticularis ammonite found in the Fox Hills Formation of South Dakota, U.S.A. Originally named by Owen in 1852 the gen...