Coshocton Flint
The source of Coshocton Flint is Coshocton Co., Ohio . Coshocton was afavorite of all cultures and was the most widely used of any Ohio material The colors ofCoshocton are black , gray , blue and even an off white .An artifact of Coshocton will normally have a combination of colors, be striated or mottled. In some cases a lightning strike or quartz line will be apparent on an artifact.
References; Converse Robert N . Ohio Flint Types, Published by The Ohio Archaeological Society 1994; pp 174 - 176