Map point data provided by iDigBio.
- C5 Sequence (Lower Whitewater, Waynesville)
Identification in Hand Sample
Cyrtodontula umbonata from the Whitewater Formation of Richmond, Indiana (OUIP 1847)
- Pelecypod. Identified by large size, by broad, prominent beaks, by the characteristic angle of the hinge line and by the posterior shape of the shell. Whitewater.
Fossils of Ohio (1996):
- The Ordovician genus Cyrtodonula is represented by C. umbonata (Ulrich), which is medium sized and has prominent beaks and a truncate posterior margin