Peltosaurus is a genus of anguid lizards that lived during the Paleogene, specifically from the Eocene to the Oligocene. The Brule Formation, where this specimen was found, is part of the White River Group, a significant fossil-bearing formation known for preserving Oligocene terrestrial ecosystems of North America. Paleontological Context Taxonomy: Peltosaurus belongs to the family Anguidae, which includes modern alligator lizards and glass lizards. It is an extinct relative of these groups. Mo