The source of Plum Run Flint is in one place on the line of Stark and Mahoning County., Ohio. The distribution of Plum Run artifacts is small. It is not usually found outside a small area away from the source. Plum Run patinates to a dull grey, tan, or brown with hints of pink or yellow. Fresh chips are easily recognized by their darker interior.
Converse Robert N . Ohio Flint Types, Published by The Ohio Archaeological Society of Ohio 1994 pp 200