Skeleton (left) of the primitive synapsid reptiles Aerosaurus, which lived during the Permian period, cast from Valley Anatomical Preparations, Canoga Park, CA.
Souvenir postcard (one of a set) from the American Museum of Natural History, New York City, reproducing Robert Butler’s (1996) painting of life during the Permian period.
Skeleton (cast, below) of the dinosaur Othnielia rex, from Valley Anatomical Preparations, Canoga Park, CA. Also, the original skeleton (bottom of page, photo by paleontologists Robert A. Long and Samuel P. Welles), in the collections of the Brigham Young University Vertebrate Paleontology Department, lacks a skull.