Thursday, July 23, 2009

Devonian Clam Modiomorpha concentrica

These pictures are of a Devonian Period clam called Modiomorpha concentrica (Conrad, 1838).  It was found in Clark County, Indiana USA in the Jeffersonville Limestone. A coral is growing on part of the shell that is probably an Aulocystis. This fossil belongs to my cousin who has been cleaning it.

I used 1889 A Monograph of the Fossil Shells of the Silurian and Devonian Rocks of Kentucky by Henry Nettelroth (1835-1887) found here. This first image is from Plate II figure 10.
The last image is from Plate II, figure 11.