Wikimedi'Òc

Granule-pebble horizon in sandstone (Dundee Sandstone, Middle Pennsylvanian; cliffs along Walnut Creek Bottom Road, west of Dundee, Ohio, USA) (23859492695).jpg - Ser Amantio di Nicolao

Underclay below the Bedford Coal (Middle Pennsylvanian; Noland Tunnel's north portal outcrop, Tunnel Hill, Coshocton County, Ohio, USA) 1 (30236490233).jpg - Ser Amantio di Nicolao

Ironstone nodule horizon above the Lower Mercer Limestone (Middle Pennsylvanian; Rt. 16 roadcut near Trinway, Ohio, USA) 3 (32441814763).jpg - Ser Amantio di Nicolao

Ironstone nodule horizon above the Lower Mercer Limestone (Middle Pennsylvanian; Rt. 16 roadcut near Trinway, Ohio, USA) 2 (33100555562).jpg - Ser Amantio di Nicolao