Essexella asherae, Mazon Creek Jellyfish Replica Kentrosaurus Most kids and adults

Most kids and adults

and in adults they projected outward away from the jaws

This specimen is a direct cast from the original specimen of Darwinius masillae

heavy vertebrae and ribs

Essexella asherae, Mazon Creek Jellyfish Replica Kentrosaurus Most kids and adultsJellyfish are extremely rare in the fossil record. This is hardly surprising, considering they completely lack hard parts, and the tissues they do possess are gelatinous. One of the most famous deposits containing fossil jellyfish is the Pennsylvanian aged Mazon Creek Lagersttte near Chicago, Illinois. In the Mazon Creek area, the Francis Creek Shale consists of concretionary gray shales. The Francis Creek concretions are sideritic, and can be