Essexella asherae, Mazon Creek Jellyfish Replica Compsognathus All families of Carnivora are

All families of Carnivora are thought to be derived from the Miacids

Time: Middle Eocene

Ailuravus is the largest

Edaphosaurus is important as one of the earliest known large plant-eating (herbivorous) amniote tetrapods (four-legged land-living vertebrates)

Their heads were horn-less but equipped with tusk-like lower incisors and were held in a horizontal position

Essexella asherae, Mazon Creek Jellyfish Replica Compsognathus All families of Carnivora areJellyfish 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