Neochonetes granulifer brachiopod fossil found in the Kewitz Shale of the Stanton Formation of the Lansing Group of Cass County, Nebraska. Fossil dates to the Upper Pennsylvanian Period. I posted a picture of a group of these fossils found at the natural history museum in Paris, France back in October 23, 2009:
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Learn more about this fossil at the University of Nebraska at Lincoln School of Natural Resources web site:
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Thanks to Mark for the fossil.