Geologic Map of Georgia -- Coastal Plain


Georgia Geologic Survey
1977

David E. Lawton


Coastal Plain Geologic Map (ca. 90kb)



Coastal Plain Sedimentary Rocks

(In stratigraphic order)

Alluvium symbol QUATERNARY ALLUVIUM Composed of unconsolidated sand and gravel located primarily on flood plains. Only the wide alluvial deposits of the major rivers in the coastal plain are shown, although alluvium occurs throughout the state.
Barrier Island Deposits symbol QUATERNARY (PLEISTOCENE AND HOLOCENE) BARRIER ISLAND DEPOSITS Located parallel to the present coast line, composed predominantly of unconsolidated sand and clayey sand which were deposited at former high sea levels.
Marsh/Lagoon Deposits symbol QUATERNARY (PLEISTOCENE AND HOLOCENE) MARSH AND LAGOON DEPOSITS Located parallel to the present coast line, composed predominantly of sand and sandy clay which were deposited at former high sea levels.
Pliocene-Miocene symbol PLIOCENE-MIOCENE DEPOSITS Includes sand, clay, fullers earth, gravel, minor limestone, dolomite, phosphatic sand, and marl.
Oligocene symbol OLIGOCENE DEPOSITS Includes limestone and minor dolomite, and the residuum from both.
Upper Eocene symbol UPPER EOCENE DEPOSITS Includes sand, clay, sandy clay, marl, and limestone of early Tertiary age.
Middle/Lower Eocene symbol MIDDLE AND LOWER EOCENE DEPOSITS Includes sand, clayey sand, kaolin, impure limestone, and marl.
Paleocene symbol PALEOCENE DEPOSITS Includes sand, clay, kaolin, limestone, and marl.
Upper K / Tertiary symbol UPPER CRETACEOUS - TERTIARY DEPOSITS Includes sand, sandy clay, and marl located in the northern coastal plain. East of the Ocmulgee River, this unit contains kaolin deposits of undifferentiated Cretaceous to lower Tertiary age.
Upper Cretaceous symbol 1 UPPER CRETACEOUS DEPOSITS Includes sand, clay, and marl.
Upper Cretaceous symbol 2 UPPER CRETACEOUS DEPOSITS Includes sand, gravel, and clay.


Map and legend are reproduced from Geologic Map of Georgia, 1977 (1:2,000,000), compiled by David E. Lawton, available from Georgia Geologic Survey.

This map and the larger (1:500,000) 1976 Geologic Map of Georgia were compiled when the ideas of plate tectonics were relatively new and their implications for Georgia geology were not well understood. See reading list for more recent interpretations.