The Albion Group is the Lower Silurian sequence that was deposited along the northwestern edge of the Appalachian basin. The Albion Group is composed of the Brassfield Limestone and the Clinton Sandstone Formations. The Clinton Sandstone is the major petroleum producing formation in Ohio.

Cross sections and isopachous and lithofacies maps indicate that the Clinton Formation occurs as a "blanket" deposit or a series of overlapping sandstone bodies which intertongue with the Cabothead Shale to the west. Deposition is commonly interpreted to have occurred in a marine-deltaic environment. The sand bodies represent delta channel sands and offshore bars. Hydrocarbon accumulations are stratigraphically controlled by sand-bed facies changes or porosity pinch-outs. The key to petroleum exploration in the Clinton Sandstone is determining the orientation and extent of the sandstone bodies through subsurface mapping.

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