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Name:
Isorthoceras sociale
Age: Ordovician
Formation: Maquoketa Formation
Location: Dubuque County, Iowa
Size: Nautiloid is 2.4 inches long.
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This is a very nice specimen of Isorthoceras sociale from the Ordovician of Iowa. This is an example of a primitive straight-shelled cephalopod known as a nautiloid. This well-preserved specimen is 3-dimensional and centered in the limestone matrix block. The simple, straight suture pattern is quite evident. This is a very displayable specimen of this primitive cephalopod from Iowa.
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