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.
Chenier plain and deltas of Suwannee & Chattahoochie Rivers
Low coastal formation in Carolinas like Penholoway but younger and lower in altitude.
Holocene beach complex sediments. Sands and gravels of littoral zone, dune system, barrier system.
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.
Another Carolina costalized terrace of early-middle Pleistocene age. Deeply weathered.