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USA Formation: Morrison Age: Late Jurassic
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The fossil
Some researchers have speculated at some obscure impressions on the specimen belonging to the primary feathers
Essexella asherae, Mazon Creek Jellyfish Replica Kentrosaurus USA Formation: Morrison Age: LateJellyfish 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
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