This Brevispirifer gregarius (Clapp, 1857) is almost a textbook example of a fossil specimen. Included with this posts are the illustrations from Henry Nettelroth's Fossil Shells of the Silurian and Devonian of Kentucky from 1889. That book referred to this fossil as a Spirifera gregaria (Clapp, 1857). These fossils are used as identification markers for the stratigraphic layers in the Jeffersonville Limestone. Devonian fossil was found in Jefferson County, Kentucky, USA.
Thanks Mike - This helps clear up the "Brevispirifer gregarius" ID for me. Now I'm sure I have a Brevispirifer and not "Fimibrispirifer grieri" - looking forward to adding a Fimibrispirifer to my Devonian collection someday. Regards - Jack
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