The Snellville Formation, here named in the Newnan-Tucker synform near Atlanta, GA, contains the lower Norris Lake Schist Member and the upper Lanier Mountain Quartzite Member. It discordantly overlies the Lithonia Gneiss and the Wolf Creek, Clairmont, and Wahoo Creek Formations of the Atlanta Group and is probably younger than the Atlanta Group. The lower contact is either a folded thrust contact or a folded angular unconformity. It is intruded by the 325 Ma Stone Mountain and Panola Granites. Zircons from the Lanier Mountain Quartzite Member have an age of 1,100 Ma. Age is Late Proterozoic and (or) early Paleozoic.
Source: GNU records (USGS DDS-6; Reston GNULEX).
The Snellville Formation and its Lanier Mountain Quartzite Member and Norris Lake Schist Member, all of Higgins and Atkins (1981), are here abandoned. The Snellville is shown to be part of the Chattahoochee Palisades Quartzite, the Factory Shoals Formation [now also abandoned (Crawford and others, in press)], and Powers Ferry Formation of the Sandy Springs Group.
Source: GNU records (USGS DDS-6; Reston GNULEX).
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