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Piedmont (United States)
The Piedmont is a plateau region located in the eastern United States between the Atlantic Coastal Plain and the main Appalachian Mountains, stretching from New Jersey in the north to central Alabama in the south. The Piedmont province is a physiographic province of the larger Appalachian division. The province consists of the Piedmont Upland and Piedmont Lowlands sections.
The Atlantic Seaboard fall line marks its eastern boundary with the Coastal Plain. To the west, the Piedmont is mostly bounded by the Blue Ridge Mountains, the easternmost range of the main Appalachians. Physiographically, the Piedmont is considered a province of the larger Appalachian Highlands physiographic division.〔(【引用サイトリンク】publisher=U.S. Geological Survey )〕 The width of the Piedmont varies, being quite narrow above the Delaware River but nearly 300 miles (475 km) wide in North Carolina. The Piedmont's area is approximately .
The name "Piedmont" comes from the French term for the same physical region, literally meaning "''foothill''", ultimately from Latin "pedemontium", meaning "the foot of the mountains". The region is named after the Italian region of Piedmont, the lowlands which abut the Alps.
==Geology==
The surface relief of the Piedmont is characterized by relatively low, rolling hills with heights above sea level between 200 feet (50 m) and 800 feet to 1,000 feet (250 m to 300 m). Its geology is complex, with numerous rock formations of different materials and ages intermingled with one another. Essentially, the Piedmont is the remnant of several ancient mountain chains that have since been eroded away. Geologists have identified at least five separate events which have led to sediment deposition, including the Grenville orogeny (the collision of continents that created the supercontinent Rodinia) and the Appalachian orogeny during the formation of Pangaea. The last major event in the history of the Piedmont was the break-up of Pangaea, when North America and Africa began to separate. Large basins formed from the rifting and were subsequently filled by the sediments shed from the surrounding higher ground. The series of Mesozoic basins is almost entirely located inside the Piedmont region.
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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