Prehistoric Trackways National Monument, Paleontological national monument in Doña Ana County, United States.

Prehistoric Trackways National Monument covers 5,255 acres of the Robledo Mountains northwest of Las Cruces, New Mexico. Its red rock, the Robledo Mountains Member of the Hueco Formation, holds fossilized footprints of land animals, sea creatures and insects, along with petrified wood and marine invertebrate fossils. The monument is largely undeveloped, with few facilities and informal trails across the desert.

The monument preserves traces from creatures that lived roughly 280 million years ago during the Permian period when tropical conditions covered the region. The landscape formed as part of the supercontinent Pangea before becoming the desert terrain visible today.

The trace fossils include at least 13 named types, such as Selenichnites, a moon-shaped mark, and Dimetropus, the footprint of Dimetrodon. Guided hikes are periodically offered by BLM interpretive staff, and many excavated slabs are held in the Jerry MacDonald Paleozoic Trackways Collection at the New Mexico Museum of Natural History and Science.

The site offers trails and routes for hikers, horseback riders, and vehicles exploring different sections of the monument. Visitors should prepare for desert weather conditions that vary with the season, as temperatures can fluctuate significantly.

Scattered footprints had been found in the Robledo Mountains for nearly fifty years before Jerry Paul MacDonald located the first in-situ Paleozoic tracks on June 6, 1987. He relied on the recollections of local hikers, quarrymen and fossil hunters to narrow his search, and the spot became known as the Discovery Site.