ClipArt ETC
"Outcrop showing faults, spur south of Deadwood." -Walcott, 1901

Outcrop

"Outcrop showing faults, spur south of Deadwood." -Walcott, 1901

Diagram illustrating width of outcrop AB of the bed, the thickness of which is AC; its depth at X is measured by the length of XY.

Width of Outcrop

Diagram illustrating width of outcrop AB of the bed, the thickness of which is AC; its depth at X is…