Pittsburgh Red Shale
"West Virginia Geological Survey 1906"
THE PITTSBURG RED SHALE
Below the Ames limestone and Harlem coal is a series of red and brown shales often with lime nuggets scattered through and thin layers of sandstone, which form the exposures near Pittsburg as named the Pittsburg Red Shale.
The formation extends across the State of West Virginia and is know by the oil drillers as the "Big Red Cave" It is a source of much trouble and expense to the driller, who is forced to use especial care in his work through this stratum.
The Pittsburg Red Shale is found in the PAN HANDLE areas wherever the Ames Limestone outcrops. Near the horizon is a bright red clay or shale, but soon changes to a brown and buff color. It is broken by thin strata of sandstone more or less shaly. The best exposure occurs in the river bluffs opposite STEUBENVILLE, where its thickness if 120 to 140 feet. It forms a vertical wall along the new river driveway at this point, and by its constant caving has caused much trouble until protected by the construction of long concrete walls.