Geography
On a clear day, Sierra Grande can be seen from as far away as Texline, Texas, as well as from the summits of the Culebra Range in southern Colorado and northern New Mexico. The eastern slopes of Sierra Grande are the easternmost point in the United States with an elevation of more than above sea level, and the peak is the highest in the United States east of 104th meridian west, 104 degrees west. U.S. Highway 64, U.S. Highway 87 and the Colorado and Southern Railway run along the north and east of the volcano. The town of Des Moines, New Mexico, Des Moines is just to the northeast. To the northwest is Capulin Volcano National Monument featuring Capulin Volcano, an extinct cinder cone also in the Raton-Clayton volcanic field. Numerous watercourses form on and around the flanks of the volcano, including Pinabete Creek (which feeds into the Dry Cimarron River to the northeast), North Branch Corrumpa Creek and South Branch Corrumpa Creek (which join and become Corrumpa Creek to the east at Weatherly Lake), Seneca Creek (New Mexico/Oklahoma), Seneca Creek, and Carrizo Creek (New Mexico/Texas), Carrizo Creek.Geology
Sierra Grande is the largest volcano in the Raton-Clayton volcanic field. Its flows range in age from 3.8 to 2.6 million years. The volcano is largely composed of two-pyroxene andesite, a rock type found almost nowhere else in the Raton-Clayton volcanic field.References
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{{Authority control Volcanoes of New Mexico Extinct volcanoes of the United States Shield volcanoes of the United States Landforms of Union County, New Mexico Mountains of New Mexico Mountains of Union County, New Mexico Volcanoes of the United States