Irwinton Sand (GAEOi;1)

Irwinton Sand (Ei), up-dip equivalent of Twiggs Clay, Sandersville Limestone, and Cooper Marl. As mapped, also includes younger clastics of indefinite Late Tertiary age.

State	Georgia
Name	Irwinton Sand
Geologic age	Eocene
Original map label	Ei
Comments	Coastal Plain sedimentary rocks
Primary rock type	sand
Secondary rock type
Other rock types
Lithologic constituents	Major Unconsolidated > Coarse-detrital > Sand
Map references	Lawton, D.E., and others, 1976, Geologic Map of Georgia: Georgia Geological Survey, scale = 1:500,000.
Unit references	Lawton, D.E., and others, 1976, Geologic Map of Georgia: Georgia Geological Survey, scale = 1:500,000.
Geographic coverage	Baldwin - Bibb - Burke - Columbia - Glascock - Hancock - Jefferson - Jenkins - Johnson - Jones - Laurens - McDuffie - Richmond - Screven - Twiggs - Warren - Washington - Wilkinson