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The Helderberg Escarpment is an escarpment in eastern New York, roughly west of the city of Albany. The escarpment rises steeply from the Hudson Valley below, with an elevation difference of approximately 700 feet (from 400 to 1,100 feet) over a horizontal distance of approximately 2,000 feet. Much of the escarpment is within John Boyd Thacher State Park, and offers spectacular views of the Hudson Valley and the Albany area. ==Geology== The escarpment is geologically related to three other escarpments, the Niagara escarpment, the Black River Escarpment, and the Onondaga Escarpment.〔 〕 The rocks exposed in the escarpment date back to the Middle Ordovician to Early Devonian. In 1934 the ''Schenectady Gazette'' described how the Tory cave, one of the limestone caves to be found in the escarpment, routinely had stalagmites of ice in the springtime.〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Helderberg Escarpment」の詳細全文を読む スポンサード リンク
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