Geologic units in Thomas county, Georgia

Miccosukee Formation (Pliocene) at surface, covers < 0.1 % of this area: Miccosukee Formation - The Miccosukee Formation, named by Hendry and Yon (1967), is a siliciclastic unit with a limited distribution in the eastern panhandle. It occurs in the Tallahassee Hills from central Gadsden County to eastern Madison County, often capping hills. The Miccosukee Formation grades to the west, through a broad facies transition, in central Gadsden County into the Citronelle Formation. The Miccosukee Formation is a prodeltaic deposit. The Miccosukee Formation is composed of grayish orange to grayish red, mottled, poorly to moderately consolidated, interbedded clay, sand and gravel of varying coarseness and admixtures (Hendry and Yon, 1967). The unit is relatively impermeable but is considered a part of the surficial aquifer system (Southeastern Geological Society, 1986).
Lithology: clay or mud; sand; gravel
Floyd Shale; Hartselle Sandstone member (Mississippian) at surface, covers 36 % of this area: Hartselle Sandstone member (Mh) in Floyd County
Lithology: sandstone
Miccosukee Formation (Neogene) at surface, covers 64 % of this area: Miccosukee Formation
Lithology: clay or mud; sand; gravel