Brontosaurus excelsus

Brontosaurus is probably the most famous of the Late Jurassic Morrison Formation sauropods. A diplodocid, it’s heavily built like Apatosaurus rather than Diplodocus. The name Brontosaurus was made famous in the U.S. due to an outreach campaign by Sinclair Oil that lasted from the 1930s to the 1960s. Ironically, during most of the 20th century the name Brontosaurus was considered a junior name of Apatosaurus; it was only revived as a distinct genus in 2015.