An outcrop of Black Hand Sandstone Member of the Cuyahoga Formation at the Blackhand Gorge State Nature Preserve, Licking County, Ohio. The Black Hand Sandstone is characterized by thick to massive beds of cross-bedded sandstone that form prominent cliffs. The Black Hand Sandstone bedrock unit was named for the large, dark, hand-shaped American Indian petroglyph carved into the cliff wall at the location of this nature preserve. The petroglyph was destroyed in 1828 during the construction of the towpath for the Ohio and Erie Canal. Bedrock in this area is from the Mississippian Geologic Period. The photograph was taken by Michael C. Hansen during stop 5 of the Ohio Sedimentology Group's field trip in April 1981. Jim Collinson is pictured [...]