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existing for approximately 10
The fossil
heavy vertebrae and ribs
The fangs of Machairodus
This specimen is a direct cast from the original specimen of Darwinius masillae
Essexella asherae, Mazon Creek Jellyfish Replica Kentrosaurus existing for approximately 10Jellyfish 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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