Category:Charcoal debris horizon in bituminous coal (Lower Mercer Coal, Pottsville Group, Pennsylvanian; Hocking County, Ohio)
Media in category "Charcoal debris horizon in bituminous coal (Lower Mercer Coal, Pottsville Group, Pennsylvanian; Hocking County, Ohio)"
The following 6 files are in this category, out of 6 total.