The fossil for today's posting is Tennessee's state fossil (I think, the genus name is slightly different). This bivalve mollusk is called Trigonia thoracica (Morton, 1834). It existed in the Cretaceous Period (144-65 million years ago). The fossil was found in the Tennessee USA.
The fossil was on display in the Evolving Planet section of The Field Museum of Natural History in Chicago Illinois, USA as of August 2020. Accession number is PE9161.
The genus named by Bruguière in 1789.
Source:
U.S. Geological Survey Professional Paper 137, The Fauna of the Ripley Formation on Coon Creek, Tennessee by Bruce Wade, 1926.
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