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Geology of Georgia (U.S. state)
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Geology of Georgia (U.S. state) : ウィキペディア英語版
Geology of Georgia (U.S. state)

The Geology of Georgia consists of four distinct geologic regions, beginning in the northwest corner of the state and moving through the state to the southeast: the Valley and Ridge region, also known as the Appalachian Plateau; the Blue Ridge; the Piedmont and the Coastal Plain. The Fall Line is the boundary between the Piedmont and the Coastal Plain.
==Appalachian Plateau==
The Appalachian Plateau geologic region only passes through the extreme northwest corner of Georgia. During the middle Ordovician Period (about 440 - 480 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. 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. 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.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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