Geologic units in Pierce county, Georgia

Pleistocene-Pliocene sands and gravels (Pleistocene-Pliocene) at surface, covers 36 % of this area

Includes, in part, Sunderland, Coharie, and Brandywine "Formations" of Cooke, 1939

Neogene undifferentiated (Neogene) at surface, covers 32 % of this area

Includes Altamaha Grit (Dall, 1892); Citronelle Formation (Matson & Berry, 1916); and "Hawthorn Formation" (Cooke, 1939). (*) - outcrops of indurated sandstone and claystone

Wicomico Shoreline Complex - marsh and lagoonal facies (Pleistocene) at surface, covers 17 % of this area

Wicomico Shoreline Complex - marsh and lagoonal facies

Stream alluvium (Quaternary) at surface, covers 13 % of this area

Stream alluvium and undifferentiated terrace deposits

Penholoway shoreline complex - marsh and lagoonal facies (Pleistocene) at surface, covers 2 % of this area

Penholoway shoreline complex - marsh and lagoonal facies