Geologic units in Fulton county, Ohio

Antrim Shale (Devonian) at surface, covers 42 % of this area

Shale; dark brown to black; carbonaceous, thinly laminated; 0 to 230 feet thick.

Sunbury and Bedford Formations, Undivided (Devonian and/or Mississippian) at surface, covers 40 % of this area

Shale and siltsone; shale, black to brownish-black, carbonaceous in upper one third of interval, gray to bluish-gray, clayey with occasional siltstone lamina and thin beds in lower two-thirds of interval.

Coldwater Shale (Mississippian) at surface, covers 18 % of this area

Shale; gray; clayey thin bedded; siderite nodules common; as much as 150 feet thick.

Coldwater Shale (Mississippian) at surface, covers 0.2 % of this area

Coldwater Shale

Traverse Group (Devonian) at surface, covers < 0.1 % of this area

Dolomite and shale interbedded with limestone; upper part dolomite; gray to light brown; thin to medium bedded; abundant chert; lower part shale interbedded with limestone; olive gray; thin to medium bedded; very fossiliferous; as much as 170 feet thick.