Geologic units in Stewart county, Georgia

Providence Sand (Cretaceous) at surface, covers 27 % of this area

Providence Sand, includes Perote Member

Ripley Formation (Cretaceous) at surface, covers 19 % of this area

Ripley Formation

Cusseta Sand (Cretaceous) at surface, covers 15 % of this area

Cusseta Sand

Blufftown Formation (Cretaceous) at surface, covers 10 % of this area

Blufftown Formation

Eocene and Oligocene Residuum, undifferentiated (Eocene-Oligocene) at surface, covers 9 % of this area

Eocene and Oligocene Residuum, undifferentiated

Nanafalia, Porters Creek, and Clayton Formations, undifferentiated (Paleocene) at surface, covers 8 % of this area

Nanafalia, Porters Creek, and Clayton Formations, undifferentiated

Tuscahoma Sand (Paleocene) at surface, covers 4 % of this area

As mapped includes lower Eocene Bashi Marl Member of the Hatchetigbee Formation

Stream alluvium (Quaternary) at surface, covers 4 % of this area

Stream alluvium and undifferentiated terrace deposits

Clayton Formation (Paleocene) at surface, covers 2 % of this area

Clayton Formation

Claiborne undifferentiated (Eocene) at surface, covers 2 % of this area

Up-dip equivalent of Lisbon and Tallahatta Formations

Alluvial, coastal and low terrace deposits (Holocene) at surface, covers 0.7 % of this area

Varicolored fine to coarse quartz sand containing clay lenses and gravel in places. Gravel composed of quartz and chert pebbles and assorted metmorphic and igneous rock fragments in streams near the Piedmont. In areas of the Valley and Ridge province gravel composed of angular to subrounded chert, quartz, and quartzite pebbles. Coastal deposits include fine to medium quartz sand with shell fragments and accessory heavy minerals along Gulf beaches and fine to medium quartz sand, silt, clay, peat, mud and ooze in the Mississippi Sound, Little Lagoon, bays, lakes, streams, and estuaries.

Selma Group; Cusseta Sand Member of the Ripley Formation (Cretaceous) at surface, covers < 0.1 % of this area

Cross-bedded, medium to coarse sand; glauconitic, fossiliferous fine sand; and dark-gray fossiliferous, micaceous, carbonaceous clay. The member occurs at the base of the Ripley Formation and extends from Georgia westward into Montgomery County where it merges with the Demopolis Chalk.