Geologic map of the Southern Roskruge Mountains (the San Pedro and the southern half of La Tortuga Butte 7.5' Quadrangles), Pima County, Arizona

The study area includes the southern Roskruge Mountains and a small area of the northernmost Coyote Mountains in Pima County, southeast Arizona (Figure 1). Elevations in the area range between 2500' and 4300'. The area lies within the sonoran desert with large areas of relatively open desert punctuated by thick brushy zones along major washes. Bedrock geology was mapped by Charles Ferguson and Wyatt Gilbert during the winter and spring of 1999-2000, and the Quaternary geology was mapped by Thomas Biggs and Phil Pearthree in the spring and summer of 2000. Some areas within the boundary of the Tohono O'Odham Nation were mapped using remote techniques. Geologic Map of the Southern Roskruge Mountains (the San Pedro and the southern half of La Tortuga Butte 7.5' Quadrangles), Pima County, Arizona Report and two map sheets, map scale 1:24,000.