Armored Lizard Skull (Peltosaurus sp.) | South Dakota Arizona The famous iridium-enriched K–T boundary

The famous iridium-enriched K–T boundary

This Harpoceras ammonite from the Posidonia Shale in Holzmaden

One of the most notable characteristics of Dimetrodon is the large sail on its back

Due to their fragile nature

Bumble Bee Jasper (or Bumblebee) is actually a combination of volcanic matter

Armored Lizard Skull (Peltosaurus sp.) | South Dakota Arizona The famous iridium-enriched K–T boundaryPeltosaurus sp. Oligocene Brule Formation Pennington County, South Dakota Specimen approx. dimensions: 3" x 1. 5" x 1" Matrix approx. dimensions: 5. 25" x 4. 5" x 4. 5" The preservation on this piece is fantastic. Its armor is well pronounced. The mouth, including teeth, eye sockets, and nostrils are all clearly visible. There is some minor restoration. Peltosaurus is an extinct genus of anguid lizard from North America that lived from the Eocene to