Appalachian trough

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• Trough Creek State Park — Geobox Protected Area name = Trough Creek State Park native name = other name = other name1 = category local = Pennsylvania State Park category iucn = III image caption = etymology type = Named for etymology = Great Trough Creek country = United… …   Wikipedia

• Great Appalachian Valley — The Great Valley, also called the Great Appalachian Valley or Great Valley Region, is one of the major landform features of eastern North America. It is a gigantic trough mdash; a chain of valley lowlands mdash; and the central feature of the… …   Wikipedia

• United States physiographic region — There are eight distinct physiographic divisions within the continental United States. Each is composed of smaller physiographic areas called provinces and sections respectively. [cite web | title = Physiographic Regions | publisher = United… …   Wikipedia

• Marcellus Formation — Stratigraphic range: Middle Devonian …   Wikipedia

• North America — North American. the northern continent of the Western Hemisphere, extending from Central America to the Arctic Ocean. Highest point, Mt. McKinley, 20,300 ft. (6187 m); lowest, Death Valley, 276 ft. (84 m) below sea level. 400,000,000 including… …   Universalium

• United States — a republic in the N Western Hemisphere comprising 48 conterminous states, the District of Columbia, and Alaska in North America, and Hawaii in the N Pacific. 267,954,767; conterminous United States, 3,022,387 sq. mi. (7,827,982 sq. km); with… …   Universalium

• Devonian Period — Interval of geologic time from 417 to 354 million years ago; it was the fourth period of the Paleozoic Era. During the Devonian, a giant continent was situated in the Southern Hemisphere (see Gondwana), and other landmasses were located in the… …   Universalium

• Delaware River — Coordinates: 39°25′13″N 75°31′11″W / 39.42028°N 75.51972°W …   Wikipedia

• Rothrock State Forest — Pennsylvania State Forest Managed Resource Protected Area (IUCN VI) The Roman Tower structure on a s …   Wikipedia

• Cowans Gap State Park — For the Ohio State Park, see Cowan Lake State Park. Cowans Gap State Park Pennsylvania State Park Natural Monument (IUCN III) …   Wikipedia

• Mississippi River — a major river of North America that flows from the US state of Minnesota to the Gulf of Mexico. It was called the ‘Father of Waters’ by Native Americans. It is 2 348 miles/3 778 kilometres long and passes the cities of Minneapolis, St Louis,… …   Universalium