text: The Appalachian Plateau geologic region only passes through the extreme northwest corner of Georgia. During the middle Ordovician Period (about 440 – 460 million years ago), the tectonic plate carrying this area collided with another plate, leading to the creation of a new subduction zone and the beginning of the Appalachians.[2] As a result of this and later orogenies, alternating beds of hard and soft Paleozoic sedimentary rocks were folded, looking much like the wrinkles one would find in a kicked floor rug.[3] In Georgia, the Valley and Ridge includes limestone, sandstone, shale and other sedimentary rocks, which have yielded construction-grade limestone, barite, ochre and small amounts of coal.[1] The extent of the Valley and Ridge is bound by the Carters Dam fault in the east and the Emerson Fault in the south.[4]
  ^ a b c d e f g "Geology of Georgia". Department of Geology. University of Georgia. Retrieved 12 June 2015.
  ^ "Geologic Provinces of the United States: Appalachian Highlands Province". Geology in the Parks. United States Geological Survey . 2 October 2014. Retrieved 12 June 2015.
  ^ "Valley and Ridge Province". Geology of National Parks. USGS. 20 January 2015. Archived from the original on July 22, 2011. Retrieved 12 June 2015.
  ^ a b Higgins, Michael W.; Crawford, Thomas J.; Atkins, Robert L.; Crawford, Ralph F. (2003). "Geologic map of the Atlanta 30′ x 60′ quadrangle, Georgia" (PDF). Geologic Investigations Series Map 1-2602. USGS. Retrieved 12 June 2015.
  ^ Hack, John T. (1982). "Physiographic Divisions and Differential Uplift in the Piedmont and Blue Ridge" (PDF). Geological Survey professional paper: 1265. U.S. Government Printing Office. Retrieved 12 June 2015.
  ^ "Geologic Provinces of the United States: Atlantic Plain Province". Geology in the Parks. USGS. 2 October 2014. Retrieved 12 June 2015.
  ^ Frazier, William J. (18 August 2014). "Coastal Plain Geologic Province". New Georgia Encyclopedia. Retrieved 12 June 2015.