This picture is of a Hippocardia cuneus (Conrad, 1840) rostroconch fossil. It existed during the Devonian period. The fossil was found in Louisville, Kentucky USA. Fossil was on display at the Natural History Museum Vienna (Naturhistorisches Museum Wien) on August 2024.
Note: Their label does not appear to be correct. It listed the fossil as "Hoareicardia cunea" being a "schnabelschaler" of the "Karbon". If it was found in Louisville then it was not in the Carboniferous Period.
