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GEOGRAPHY The Cumberland Plateau is a deeply Dissected Plateau , with Topographic relief commonly of about four hundred feet (120 meters), and frequent Sandstone Outcrop pings and bluffs. Many Coal seams are present in the area, and the Cumberland Plateau has for many years been heavily Mined . At Kentucky's Pottsville Escarpment , which is the transition from the Cumberland Plateau to the Bluegrass in the north and the Pennyrile in the south, there are many spectacular Cliff s, Gorge s, Rockhouse s, Natural Bridge s, and Waterfall s. In Tennessee, the Cumberland Plateau's western border is the Highland Rim east of the Nashville Basin , and its eastern edge is marked by Walden Ridge , which continues south into Alabama as Sand Mountain . Walden Ridge and Sand Mountain are separated from the main portion of the Cumberland Plateau by the Sequatchie Valley , which extends into central Alabama under other names. In Kentucky , the height of the plateau's hills increases from northwest to southeast, with the westernmost areas of the plateau having a relief of around 200 feet and an appearance similar to the Knobs Region , whereas areas near Black Mountain have a relief exceeding 2,500 feet. GEOLOGY The Cumberland Plateau is contiguous with the Allegheny Plateau on the northern side, the only real difference being local naming. The Sedimentary Rock s that compose both plateaus are of Mississippian and Pennsylvanian Geological age, composed of near shore sediments washed westward from the old Appalachian Mountains . Some Rock layers were laid down in shallow coastal waters, some, including Bituminous Coal seams were laid onshore in swampy environments. These are interlaced with delta formations of cross-bedded sandstones and occasionally conglomerate. There are numerous Discontinuities in the beds, where they were raised high enough to be eroded, then lowered to have more sediments added on top. NATURAL HISTORY The plateau contains some of the largest stretches of contiguous forest in the eastern United States; however, the rich, native Deciduous forests are increasingly being converted to monoculture pine plantations. Ecologically, it is a part of the Appalachian Mixed Mesophytic Forests Ecoregion . SEE ALSO FURTHER READING
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