A fault in rock face at the International Salt Company's mine operation site at Cleveland, Cuyahoga County, Ohio. Ohio's rock-salt deposits are confined to the Salina Group of the Silurian Geologic Period. The F unit of the Salina Group is the principal salt-bearing unit in Ohio and is further subdivided into four units. The F2 unit is mined by the International Salt Company at the Cleveland Mine. The underground mine is operated on a room and pillar system that leaves central pillars of salt to hold up the structure. The image was made by Michael C. Hansen in 1985.
