Historical Marker
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.
During World War II, New Mexico was the site of several top-secret military installations, including the Los Alamos National Laboratory, where the atomic bomb was developed. The laboratory is still one of the largest employers in the state and conducts research in fields such as nuclear energy and national security.