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Geology of Tennessee : ウィキペディア英語版 | Geology of Tennessee
The geology of Tennessee is as diverse as its landscapes. Politically, Tennessee is broken up into three Grand Divisions: East, Middle, and West Tennessee. Physically, Tennessee is also separated into three main types of landforms: river valley plain, highlands and basins, and mountains. ==The Paleozoic== Most of the sediment across Middle Tennessee was deposited from the Ordovician to the Mississippian, roughly between 400 and 300 million years ago. The sediment was primarily deep ocean limestones with some shale layers. Mississippian limestones are generally thicker than those of the Ordovician, and additionally, more cherty. In the Ordovician, the Appalachian Mountains began to form and by the end of the Paleozoic were tall peaks. During the Pennsylvanian, the Cumberland Plateau formed along the edge of the Appalachians as beach and shore sediments, primarily sandstone today.
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