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Ausable Chasm, New York
Ausable Chasm is a sandstone gorge and tourist attraction located in the village of Keeseville, New York, U.S.〔("AuSable Chasm", ''Amazing Adirondack Wonders'', Adirondack Wilderness Foundation, 2011 ISBN 9781458364159 )〕 The Ausable River runs through it, and then empties into Lake Champlain. It is directly due west of Port Kent, New York. The gorge is about two miles long, and is a tourist attraction in the Adirondacks region of Upstate New York. It is fed by the Rainbow Falls at its southern extreme.
==Geological formation==
Geologically, the gorge is fairly simple. The Ausable River carved a gorge a little over a mile long (~2 km) down through the 500-million-years-old Cambrian-Period Potsdam Sandstone since the end of the Pleistocene Epoch ice age around 10,000 years ago. The headward erosion of ancestral Rainbow Falls led to its location today near the visitor's center.〔http://hudsonvalleygeologist.blogspot.com/2013/11/ausable-chasm.html〕
Ausable Chasm was first seen by non-Native Americans in 1765 and, since then, has been a draw to tourists in the eastern Adirondacks.The chasm has a continuous exposure of a section of the Potsdam Sandstone more than thick, which includes a rare, mid-Cambrian jellyfish fossil.〔James W. Hagadorn and Edward S. Belt (2008), Stranded in Upstate New York: Cambrian Scyphomedusae from the Potsdam Sandstone, ''Palaios'', v. 23, p. 424–441, 〕
Some of the rock formations have been given names such as The Devil's Oven, Cathedral, Sentinel Rock, Elephant's Head, The Flume, and Table Rock.〔
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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