|Name||Lookout Sandstone; Gizzard Formation|
Sedimentary > Clastic > Mudstone > Shale
Sedimentary > Clastic > Sandstone
Sedimentary > Coal
|Comments||Ridge and Valley sedimentary rocks. Secondary unit description from USGS Geologic Names lexicon (ref. GA003): Unit is composed of argillaceous shale or fire clay, sandy shale, and sandstone with 10 to 70 ft of conglomerate at top. Thickness 50 to 600 ft. In thicker portions contains at least two coal seams. Basal formation of Coal Measures. Overlies Bangor limestone and underlies Walden sandstone. Equivalent to Millstone grit of Smith. Age is Pennsylvanian.|
Lawton, D.E., Moye, F.J., Murray, J.B., O'Connor, B.J., Penley, H.M., Sandrock, G.S., Marsalis, W.E., Friddell, M.S., Hetrick, J.H., Huddlestun, P.F., Hunter, R.E., Mann, W.R., Martin, B.F., Pickering, S.M., Schneeberger, F.J., and Wilson, J.D., 1976, Geologic Map of Georgia, Georgia Dept. of Natural Resources, Geologic and Water Resources Division, Georgia Geological Survey. Scale 1:500,000.
USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/