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The fossil
The fangs of Machairodus
and in adults they projected outward away from the jaws
heavy vertebrae and ribs
The broad blunt cheek teeth show extensive wear associated with occlusion
Essexella asherae, Mazon Creek Jellyfish Replica Kentrosaurus The fossilJellyfish 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