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The '''Geology of Department Of Geology (accessed October 25, 2006) VALLEY AND RIDGE The Valley and Ridge geologic region only passes through the extreme northwest corner of Georgia. During the middle mapping project (accessed October 25, 2006) 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 . The extent of the Valley and Ridge is bound by the Carters Dam Fault in the east and the Emerson Fault in the south. ''Georgia Geology'' by Chuck Cochran (accessed October 25, 2006) BLUE RIDGE The Blue Ridge geologic region forms the North Georgia Mountains . In this region, the highest points in Georgia are found, including Brasstown Bald . The Blue Ridge consists of Metamorphic Rocks , either metamorphosed equivalents of Sedimentary Rocks or Igneous Rocks , and the region includes the Metavolcanic Rocks of the Georgia Gold Belt . The region also includes igneous Intrusions of Granite and Diabase . From the discovery of gold in the Georgia Gold Belt in 1828 , enough gold was mined in the area to cause a Branch Mint of the United States Mint to be located in Dahlonega, Georgia . Marble and talc are other resources produced in the Blue Ridge in Georgia. PIEDMONT The Piedmont geologic region is composed of document (accessed October 25, 2006) Rocks typical of the region include Schist , Amphibolite , Gneiss , Migmatite , and Granite . This region is more hilly than mountainous and is marked by lower elevations than the Blue Ridge. Nevertheless, the Piedmont is home to prominent features like Stone Mountain and the Brevard Fault zone, an ancient fault zone that last moved about 185 million years ago. ''Brevard Fault Zone'' by Chuck Cochran (accessed October 25, 2006) COASTAL PLAIN The Coastal Plain in Georgia is part of a geologic region that extends from New Jersey to Texas and consists of mapping project (accessed October 25, 2006) It is divided from the Piedmont by the Fall Line , which passes through Georgia from Augusta, Georgia in the east, then southwestward to Macon, Georgia , then to Columbus, Georgia and finally westward to Montgomery, Alabama . The rocks in this region are from the Late Cretaceous to Holocene periods, with some marine and terrestrial Fossils and rare fragments of Dinosaurs . The main mineral resource of the Coastal Plain in Georgia is Kaolin . REFERENCES SEE ALSO |
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