Ellenville Fault Ice Caves - Ellenville, New York - U.S. National Natural Landmarks on Waymarking.com

395 acres containing the largest known exposed fault system in the United States, along with a series of ice caves formed from fault debris.

This is part of the Shawangunk Ridge. The distinctive white rock that caps the Ridge is made up of quartz sand and pebbles. The space between these sediments was filled with quartz "cement" and slowly converted to rock called "conglomerate." These hard layers were folded and fractured 350 million years ago. The cliff-edged ridges were then partly worn away by weathering and water erosion, and finally polished by glacial action.

NNL Site

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