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Name:
Aviculopecten mazonensis
Age: Pennsylvanian
Formation: Carbondale Formation
Location: Braidwood, Illinois
Size: Concretion is 1.6 inches across
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Here is a fine example of a Paleozoic bivalve. This is Aviculopecten mazonensis from the famous Mazon Creek area of Illinois. This bivalve is well preserved in a siderite concretion. Both halves of the concretion are present, so both part and counterpart of the fossil are intact. This clam exhibits good detail - the radiating ornamentation of the bivalve is easily seen. This is a nice specimen of Aviculopecten from the Pennsylvanian.
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