| Geography Of Georgia U.s. State |
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The Geography of Georgia describes a State in the southeastern United States in North America . The Golden Isles Of Georgia lie off the coast of the state. The main geographical features include mountains such as the Ridge-and-valley Appalachians in the northwest, the Blue Ridge Mountains in the northeast, the Piedmont plateau in the central portion of the state and Coastal Plain in the south. The highest area in Georgia is Brasstown Bald which is 1,458m (4,784 ft) above sea level, while the lowest is at sea level, at the Atlantic Ocean . Georgia is located at approximately 33° N 83.5° W. The state has a total area of 154,077 km&2 (57,906 sq mi) and the geographic center is located in Twiggs County . USGS.gov , Accessed May 25, 2007 PHYSICAL GEOGRAPHY Geological development The oldest known rock found in Georgia comes from the Precambrian Proterozoic era and is about 1 to 1.3 billion years old and is found in the Piedmont Plateau and Blue Ridge mountain regions. Approximately 1 billion years ago a metamorphic change occurred during the an event called the Grenville Orogeny and caused the rocks, which were originally Sediment , to compress into a form of rock called Gneiss due to heat and pressure. Around 630 million years ago the Grenville mountains began to erode carrying sediments from streams to the sea. The gneiss formed from these sediments created the Marble , Metaconglomerate , Phyllite , Quartzite , Schist , and Slate found in the Blue Ridge and Piedmont areas. Three separate orogeny events impacted the eastern portion of North America during the Paleozoic. From these orogeny came Folding , Faulting , and Igneous Intrusions in the Piedmont, the Blue Ridge, the Valley and Ridge and the Appalachian Plateau. New Georgia Encyclopedia: Geologic History of Georgia: Overview Accessed, May 22, 2007 REFERENCES |
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