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SP Mountain is a prominent cinder cone in the northern partof the San Francisco volcanic field near the southern margin of the Colorado Plateau. It is easily visible from U.S. 89 among a cluster of older cinder cones. The area is most readily reached by driving north from Flagstaff about 34 mi (55 km) or south from Cameron 16 mi (26 km) to a graded ranch road that leads westward 5.2 mi (8.4 km). The turnoff is 2.1 mi (3.4 km) north of the entrance to Wupatki National Monument and is marked only by a stop sign. The site is accessible to all vehicles, Ownership of most of the land is divided between the CO Bar Livestock Company and the state of Arizona in a checkerboard pattern of one-mile sections; permission to visit and collect samplesis not required (1984). The northern tip of the SP lava flowextends into the Navajo Indian Reservation (Fig. 1).

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