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- Title is exactly "<em>Pterotrigonia</em> aff. <em>thoracica</em> (van Hoepen 1929) Single Clam valve"
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Pterotrigonia aff. thoracica (van Hoepen 1929) Single Clam valve
(DSM# 10171) Pterotrigonia is the state fossil of Tennessee. This specimen is preserved in pyrite.