Tuesday, November 27, 2012

Strophonella reversa from Iowa

These next specimens, which come from Rockford, Iowa, I purchased from a seller on E-bay. They are Strophonella reversa and come from the Lime Creek formation.Compared to other members of the Strophomenida order, these are relatively robust fossils which display the typical curvature of the Pedicle valve, but the Brachial valve is not as convex.

Pedicle valve


Brachial valve



Four specimens side by side to show the variation within the species.

The above specimens came from the Cerro Gordo member of the Lime Creek Formation, which is Upper Devonian (Fransian) in age.

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