8.5" Priscacara serrata | Green River Formation | Wyoming vertebrae Each half has been cut

Each half has been cut flat and left unpolished

marking the end of a once-thriving group of Paleozoic arthropods

where parents carefully nurture eggs and hatchlings in their mouths

Dimetrodon actually became extinct 40 million years before the first appearance of dinosaurs

A thin layer on the outside of the nodules is usually different in color

8.5" Priscacara serrata | Green River Formation | Wyoming vertebrae Each half has been cutPriscacara serrata Eocene (51. 98 Million Years Ago) Private Quarry, Green River Formation, Wyoming, USA Preparation by Carl Ulrich Obtained from the collection of Dr. William Rieger Fish approx. size: 8. 5" Plate approx. size: 18" x 14" Stand not included. Order Perciformes Family Moronidae C. liops, P. serrata, H. hypsacantha, and undescribed Priscacara & Hypsiprisca species P. serrata is perhaps the most popular and sought after of the Green River