Palisades Sill

These spectacular cliffs are cut by the Cimarron River through igneous rock known as a sill and composed of the rock type monzonite which was emplaced some 40 million years ago as these Southern Rocky Mountains were being uplifted. Elevation 8,000 feet.

Text of marker from: New Mexico Historic Preservation Division, Public Relations, Official Scenic Historic Markers

Marker is on U.S. 64 at milepost 293.9, 2.8 miles west of Hummingbird Lane, on the left when traveling east.