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The Raton-Clayton Volcanic Field is located on the High Plains of northeastern New Mexico. The field extends for more than 85 mi (137 km) from near Trinidad, Colorado, southeastward through Raton, New Mexico, to Clayton, New Mexico. U.S. 64/87 runs along the axis of the field, and most of the important features can easily be seen from this highway. This is one of the best routes from Texas and Oklahoma to Denver and other cities in Colorado. Capulin Mountain and a few other points can easily be visited while traveling this route without significantly extending the trip. All of the locations described here are on paved highways, accessible with almost any type of vehicle. Most of the land in this area is private or leased state land so that permission must be obtained for collecting and travel off the highways.

Capulin Mountain, a large cinder cone with associated lava flows, is near the center of the volcanic field. The Capulin Mountain National Monument encompasses the cone and 775 surrounding acres (314 ha). The entrance is on New Mexico 325, 3mi (4.8 km) north of the town of Capulin which is on U.S. 64/87, 54 mi (87 km) west of Clayton and 30 mi (48 km) east of Raton. The monument is open all year from 8:00 a.m. to 4:30 p.m. (later during the summer). There is a road spiraling up the cone to the rim of the crater about 1, 000 ft (300 m) above the base. The trail around

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