Ausable Chasm is a sandstone

Sandstone

Sandstone is a sedimentary rock composed mainly of sand-sized minerals or rock grains.Most sandstone is composed of quartz and/or feldspar because these are the most common minerals in the Earth's crust. Like sand, sandstone may be any colour, but the most common colours are tan, brown, yellow,...

 gorge tourist attraction located near Keeseville, New York

New York

New York is a state in the Northeastern region of the United States. It is the nation's third most populous state. New York is bordered by New Jersey and Pennsylvania to the south, and by Connecticut, Massachusetts and Vermont to the east...

. The Ausable River runs through it, which then empties into Lake Champlain

Lake Champlain

Lake Champlain is a natural, freshwater lake in North America, located mainly within the borders of the United States but partially situated across the Canada—United States border in the Canadian province of Quebec.The New York portion of the Champlain Valley includes the eastern portions of...

.

The gorge is about two miles long, and is a minor tourist attraction in the Adirondacks region of Upstate New York

Upstate New York

Upstate New York is the region of the U.S. state of New York that is located north of the core of the New York metropolitan area.-Definition:There is no clear or official boundary between Upstate New York and Downstate New York...

. It is called by some, the "Grand Canyon of the East", and is fed by the Rainbow Falls, at its southern extreme.

The chasm has a continuous exposure of a section of the Potsdam Sandstone

Potsdam Sandstone

The Potsdam Sandstone is a geologic formation of late Cambrian to early Ordovician age found in upstate New York and northern Vermont. A well-cemented sandstone of nearly pure quartz, in the 19th century it was widely used in construction and in refractory linings for iron furnaces.-Name and type...

more than 160 metres (524.9 ft) thick.

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