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Purgatory Chasm State Reservation
Purgatory Chasm State Reservation is a Massachusetts state park located off Route 146 on Purgatory Road in the town of Sutton. The park, managed by the Massachusetts Department of Conservation and Recreation, is notable for its , chasm of granite bedrock〔 featuring abrupt precipices and boulder caves in which ice lingers into the early summer.
==History==
Several theories have been proposed to account for the chasm's creation. According to one, the chasm was created when glacial meltwater from a burst ice dam ripped out blocks of bedrock at the end of the last Ice Age (14,000 years ago).〔 Purgatory Chasm was declared a state park in 1919.
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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