Plesiosaurus macrocephalus, juvenile Found by Mary Anning Argentinosaurus Hoplophoneus (pronounced hop-loh-PHONE-ee-us) was a

Hoplophoneus (pronounced hop-loh-PHONE-ee-us) was a relatively small saber-toothed cat (about 1 1/2 to 2 times the size of a housecat) that lived during the Oligocene period (from about 40 million to 20 million years ago)

and became smaller farther away from the jaw tips

but was not seriously excavated for scientific study until the 1970's

Pachycephalosaurus was one of the last non-avian dinosaurs before the Cretaceous extinction event

The quarry was used to mine bituminous shale

Plesiosaurus macrocephalus, juvenile Found by Mary Anning Argentinosaurus Hoplophoneus (pronounced hop-loh-PHONE-ee-us) was aThis juvenile Plesiosaur is from the Jurassic of Lyme Regis, England. It was found by Mary Anning. Plesiosaurs (meaning "near lizard") were flippered marine reptiles from the Mesozoic Era they were not dinosaurs. Plesiosaurs are divided into two groups: the Plesiosauroids with long, snake like necks, tiny heads, and wide bodies, and the Pliosauroids, which had large heads with very strong jaws and short necks. The first plesiosaur skeletons were found