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| Arabia Mountain Heritage Area Geology |
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| Arabia Mountain is known as a rock outcrop and a monadnock. A monadnock is an isolated hill standing above the surrounding area, in this case wooded Piedmont land. Many rock outcrops lie east of Atlanta. Most are active quarries. Stone Mountain, Panola Mountain, and Arabia Mountain are being protected by local and state governments. Four hundred million year old Arabia Mountain is the oldest of these three monadnocks, 100 million years older than its granite cousins. Arabia is famous for the swirling rock pattern characteristic of "Lithonia gneiss," which looks especially beautiful on foggy days. Arabia Mountain was formed when rock was pushed upward toward the earth's surface, but still lay underground. As Stone Mountain and Panola Mountains were formed, Arabia Mountain underwent a change and the original granite rock was metamorphosed into gneiss (nice) rock. |
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