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Old Black is a mountain in the Great Smoky Mountains, located in the Southeastern United States. While often overshadowed by Mount Guyot, its higher neighbor to the south, Old Black is the 4th-highest mountain in Tennessee() and the 7th-highest in the Great Smoky Mountains National Park.() The Appalachian Trail crosses its western slope, connecting the Cosby-area trail system with the heart of the Eastern Smokies. Like much of the Smokies crest, Old Black lies along the border between Tennessee and North Carolina, with Cocke County and Sevier County to the west and Haywood County to the east. The mountain rises above its northwestern base near Rocky Grove () and above its southeastern base near Walnut Bottom.() Old Black is part of the Guyot massif, which extends deep into the interior of the Smokies. A ridge known as Pinnacle Lead intersects this massif— which comprises the eastern section of the crest of the Smokies— on the western slope of Old Black, giving Old Black a triangular shape similar to that of Tricorner Knob to the south. Old Black gets its name from the dense Southern Appalachian spruce-fir forest that coats its higher elevations.〔Michael Frome, (1994) ''Strangers In High Places: The Story of the Great Smoky Mountains'' Knoxville: University of Tennessee Press, 107.〕 From afar, this forest takes on a dark green character, especially in cooler months when contrasted with the brown hardwood forest in lower elevations. This forest also adds to Old Black's blunt appearance— that of a low pyramid with a wide base. == Geology == Old Black comprises Thunderhead sandstone, a type of Precambrian metamorphic rock common throughout the Smokies.〔Harry Moore, ''A Roadside Guide to the Geology of the Great Smoky Mountains National Park'' (Knoxville: University of Tennessee Press, 1988), 66-68.〕 The rock is part of the Ocoee Supergroup, which was formed from ocean sediments nearly a billion years ago.〔Moore, p. 32.〕 The mountain was created over 200 million years ago during the Appalachian orogeny, when the North American and African plates collided, thrusting the rock upward.〔Moore, p. 23-27.〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Old Black (Great Smoky Mountains)」の詳細全文を読む スポンサード リンク
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