Wikimedi'Òc

Pebbly sandstones over mudshales (Mississippian-Pennsylvanian unconformity; Mary Campbell Cave, Cuyahoga Gorge, Cuyahoga Falls, Ohio, USA) 1 (30383924587).jpg - Ser Amantio di Nicolao

Pebbly sandstones over mudshales (Mississippian-Pennsylvanian unconformity; Mary Campbell Cave, Cuyahoga Gorge, Cuyahoga Falls, Ohio, USA) 2 (31449783848).jpg - Ser Amantio di Nicolao

Sharon Sandstone (Lower Pennsylvanian; Mary Campbell Cave, Cuyahoga Gorge, Cuyahoga Falls, Ohio, USA) 1 (44411342545).jpg - Ser Amantio di Nicolao

Sharon Sandstone (Lower Pennsylvanian; Mary Campbell Cave, Cuyahoga Gorge, Cuyahoga Falls, Ohio, USA) 2 (30383984847).jpg - Ser Amantio di Nicolao

Sharon Sandstone (Lower Pennsylvanian; Mary Campbell Cave, Cuyahoga Gorge, Cuyahoga Falls, Ohio, USA) 3 (43508586780).jpg - Ser Amantio di Nicolao