Читать книгу Afoot & Afield: Atlanta. 108 Spectacular Outings in North-Central Georgia онлайн

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BLUE RIDGE

The north-central and northeast regions of Georgia lie within the southern boundary of the Blue Ridge zone, which extends to Virginia. Millions of years ago, sheets of the earth’s crust were compressed, thrust upward, and stacked to form the dramatic mountains ranging from 2,000 feet to nearly 5,000 feet in elevation. Here is Georgia’s high point, Brasstown Bald, and towering peaks such as Yonah Mountain. The land in the eastern portion of Georgia’s Blue Ridge is primarily comprised of igneous and metamorphic rock, such as granite and quartzite. Geologic activity in this region also formed deposits of marble, as well as the Gold Belt, which runs from the Alabama border to Lumpkin and White counties in northeast Georgia.

PIEDMONT PLATEAU

Atlanta, Athens, and the majority of Georgia’s population lie within the Piedmont zone, which runs across the belly of the state, between the Valley and Ridge and Blue Ridge zones to the north and the Coastal Plain to the south. This region is mostly comprised of rolling hills, though faults in the southwestern Piedmont created Pine Mountain, which rises dramatically amid the surrounding lowlands. The rocks in the Piedmont zone are primarily igneous and metamorphic, which have weathered to form the red clay that is known so well in the state. This region also includes igneous granite, which makes up Stone Mountain and Panola Mountain near Atlanta. Important natural resources in the Piedmont include the Chattahoochee River, which follows the ancient Brevard Fault Zone that runs from Alabama to North Carolina. The Piedmont area was once a region of thriving oak and hickory forest, but the removal of timber and farming of cotton and tobacco have left the area largely covered in pines.