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).
Figures & Tables
Rocky Mountain Section of the Geological Society of America
One of six volumes generated by each GSA section for the Decade of North American Geology (DNAG) project, this Centennial Field Guide contains descriptions of 100 sites or site clusters representing outstanding geologic locations in northern Arizona, Colorado, Idaho, Montana, North Dakota, New Mexico, South Dakota, Utah, Wyoming, and Alberta.