Trading Run chert, Allegany County, Maryland.
Trading Run valley, north of Oldtown, Allegany County, Maryland. Sample obtained from colluvium on the west side of the valley. Unknown Devonian formation. Probably colluvium from the Helderberg formation exposed on the top of Warrior Mountain.
Light-colored (white, gray, tan, yellow, and pick), heavily weathered blocky and tabular float materials. Numerous bedding planes with marked iron staining limit utility.
Prepared By Ebright 1999