- Indiana Memory
- Indiana Department of Natural Resources, Division of State Parks and Reservoirs
Silicified, common species. Beechwood Limestone, Givetian, Middle Devonian, Clark County.
- Heliophyllum halli Edwards
- For Fair Use Only. Not For Commercial Use. These images are available for editorial and academic use only. For information on commercial or other image requests, please contact the Falls of the Ohio State Park.