Geologic units in Tattnall county, Georgia

Neogene undifferentiated (Neogene) at surface, covers 65 % of this area

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

Pleistocene-Pliocene sands and gravels (Pleistocene-Pliocene) at surface, covers 24 % of this area

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

Stream alluvium (Quaternary) at surface, covers 6 % of this area

Stream alluvium and undifferentiated terrace deposits

Wicomico Shoreline Complex - marsh and lagoonal facies (Pleistocene) at surface, covers 4 % of this area

Wicomico Shoreline Complex - marsh and lagoonal facies

Aeolian sand deposits - parabolic dunes (Quaternary) at surface, covers 2 % of this area

Aeolian sand deposits - parabolic dunes