An extinct andesite-shield volcano, Sierra Grande sits over 2,200 feet above the rest of the terrain. It has an elevation of 8,720 feet. The volcano erupted between 2.41 to 2.88 million years ago. It is part of the Raton-Clayton Volcanic Field, and it is the tallest volcano in the range.
The volcano is 10 miles southeast of Capulin Volcano, and it is surrounded by lava flows.
Historical Marker Inscriptions
Over Left Shoulder
Sierra Grande
Largest extinct volcano in northeastern New Mexico, Sierra Grande rises to an elevation of 8,720 feet, one of many volcanos, cinder cones, and flows that cover more than 1,000 square miles of area in northeastern New Mexico and southeastern Colorado eastward to the Oklahoma state line.
Location
36° 41’ 3.732” N, 103° 47’ 10.740” W
3831 US-87 W, Des Moines, NM 88418, United States
Historical Markers of the World 