Geologic units in Effingham county, Georgia

Wicomico Shoreline Complex - marsh and lagoonal facies (Pleistocene) at surface, covers 28 % of this area

Wicomico Shoreline Complex - marsh and lagoonal facies

Penholoway shoreline complex - marsh and lagoonal facies (Pleistocene) at surface, covers 23 % of this area

Penholoway shoreline complex - marsh and lagoonal facies

Pleistocene-Pliocene sands and gravels (Pleistocene-Pliocene) at surface, covers 18 % of this area

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

Stream alluvium (Quaternary) at surface, covers 16 % of this area

Stream alluvium and undifferentiated terrace deposits

Wicomico Shoreline Complex - barrier island facies (Pleistocene) at surface, covers 8 % of this area

Wicomico Shoreline Complex - barrier island facies

Penholoway shoreline complex - barrier island facies (Pleistocene) at surface, covers 3 % of this area

Penholoway shoreline complex - barrier island facies

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

Talbot shoreline complex - marsh and lagoonal facies

Alluvial Valley Swamp (Quaternary) at surface, covers 0.9 % of this area

Unconformable on all underlying units, fluvial sand and gravel at base, grading upwards into fine sands and silts, local peat. May be overrun with recent sediments from forest cutting and agriculture.

Hawthorn Formation (Miocene) at surface, covers 0.7 % of this area

Includes Marks Head Formation; Parachucia Beds (Sloan, 1905); and Alum Bluff Formation (Veatch and Stephenson, 1911).

Neogene undifferentiated (Neogene) at surface, covers 0.3 % of this area

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

Holocene Shoreline Complex - marsh and lagoonal facies (Holocene) at surface, covers < 0.1 % of this area

Holocene Shoreline Complex - marsh and lagoonal facies

Tidal Marsh (Quaternary) at surface, covers < 0.1 % of this area

Peat and muck deposits along tidal margins of esturaries and back bays. Deposits range from a few feet to 60+ feet deep. Locally include silt and fine sand and clay as levees on tidal channels. At depth peaty material may be accumulated from fresh water plants. Peat at the surface dominated by spartina and other salt tolerant species.

Pamlico shoreline complex - marsh and lagoonal facies (Pleistocene) at surface, covers < 0.1 % of this area

Pamlico shoreline complex - marsh and lagoonal facies

Chenier plain and deltas of Suwannee & Chattahoochie Rivers (Holocene) at surface, covers < 0.1 % of this area

Chenier plain and deltas of Suwannee & Chattahoochie Rivers