Geologic units in Steuben county, Indiana

Coldwater Shale (Mississippian) at surface, covers 99 % of this area

Mostly gray shale

Coldwater Shale (Mississippian) at surface, covers 0.4 % of this area

Coldwater Shale

Ellsworth Shale (Devonian-Mississippian) at surface, covers 0.4 % of this area

Green shale; some black shale in lower part