Río Grande Rift (1)

Historical marker location:

US 64, Tres Piedras vicinity, New Mexico

( north of Tres Piedras)

A tremendous split in the earth’s crust has resulted in the Río Grande rift basin filled with thousands of feet of alluvium from bordering mountains and lava flows from deep within the earth. About 650 feet of this basin-fill is exposed in the Río Grande Gorge at the bridge crossing.