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indicates she was a female
The first true Crinoids appeared during the Lower Ordovician
The deposition depth at the center of Fossil Lake is about 200-260 feet thick
of the Egg Mountain brooding colony of a much larger relative
Eryops megacephalus, skull, Permian Argentinosaurus indicates she was a femaleEryops (pronounced EAR ee ops) (meaning "long eye" or "drawn out eye" in Greek) was a common, primitive labyrinthodontid amphibian that lived in Permian period swamps. This meat eater had a stout body with very wide ribs, a strong spine, four short, strong legs, a short tail, and a wide, elongated skull with many sharp teeth. Its teeth had enamel with a folded pattern. Eryops was about 5 feet long, one of the largest land animals of its time. Eryops
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