Ausable Chasm is a sandstone gorge and tourist attraction located near the hamlet of Keeseville, New York, United States. It is directly due west of Port Kent. The Ausable River runs through it and then empties into Lake Champlain. The gorge is about two miles (3.2 km) 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. Geologically simple, the Ausable Gorge was carved out of 500 million-year-old Potsdam Sandstone from the Cambrian Period. Since the end of the Pleistocene Epoch ice age 10,000 years ago, the movement and subsequent melting of glaciers created a series of caves and tunnels, which the Ausable River linked up and exploited on its one mile (1.6 km) journey to Lake Champlain. During this time, the headward erosion of ancestral Rainbow Falls led to its location today, where the visitor's center was built. More information...
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