3.5" Ordovician Oncoceratid (Richardsonoceras) Fossil - Wisconsin

This is a 3.5" long (straightline) example of Richardsonoceras simplex, an Oncoceratid (Nautiloidea) from the Middle-Upper Ordovician of Wisconsin. This fossil is part of an old collection from the Grand Detour Formation in Rock County, Wisconsin. Oncoceratids are curved nautiloid cephalopods that have been identified from the Middle Ordovician, up to Late Silurian. Richardsonoceras is known for having a stronger convex curvature than other cephalopods in the family Oncoceratidae.

This fossil has been partially exposed from the rock it was found in. There is a repaired crack through the cephalopod. Comes with an acrylic display stand.
DETAILS
SPECIES
Richardsonoceras simplex
LOCATION
Rock County, Wisconsin
FORMATION
Grand Detour Formation
SIZE
3.5" long (straightline) cephalopod in 4.3 x 3.3" rock
CATEGORY
ITEM
#162961
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