Anthracosia sp.
Piesberg
Westfalian D
Size 1.5 cms
In some layers freshwater bivalves occur. These shells can be used for
stratigraphic purposes.
A second common bivalve in Upper Carboniferous layers is Carbonicola
sp. The two genera can be distinguished by the flat top of Anthracosia
and the more projected top of Carbonicola. In the latter genus faint
radial lines run from the top across the shell.