<Tr> <Th> Orogeny </Th> <Td> Alleghenian orogeny </Td> </Tr> <Tr> <Th> Type of rock </Th> <Td> Sandstone and Quartzite </Td> </Tr> <P> The Allegheny Mountain Range / ælɪˈɡeɪni /, informally the Alleghenies and also spelled Alleghany and Allegany, is part of the vast Appalachian Mountain Range of the Eastern United States and Canada and posed a significant barrier to land travel in less technologically advanced eras . The barrier range has a northeast--southwest orientation and runs for about 400 miles (640 km) from north - central Pennsylvania, through western Maryland and eastern West Virginia, to southwestern Virginia . </P> <P> The Alleghenies comprise the rugged western - central portion of the Appalachians . They rise to approximately 4,862 feet (1,483 m) in northeastern West Virginia . In the east, they are dominated by a high, steep escarpment known as the Allegheny Front . In the west, they slope down into the closely associated Allegheny Plateau, which extends into Ohio and Kentucky . The principal settlements of the Alleghenies are Altoona, State College, and Johnstown, Pennsylvania; and Cumberland, Maryland . </P>

Where are the allegheny mountains on a map
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