The main US Geological Survey (USGS) quadrangle maps covering the ranch and surrounds have been made available in kmz format and can be viewed as a 3D overlay in Google Earth. Assuming that you have Google Earth installed (and that it is the application associated with kmz files), click on the link and select open. After downloading, GE should open and you will see the USGS link in your Temporary Places folder. Right click on the included “Map” folder and adjust the Transparency unit you can make out the underlying satellite and road network.
- Geologic map of the Mount Wrightson Quadrangle, southeast of Tucson, Santa Cruz, and Pima counties, Arizona, by Harald Drewes (1971), USGS Miscellaneous Geologic Investigations Map I-614 (link downloads a kmz file)
- Geologic map and sections of the Nogales and Lochiel quadrangles, Santa Cruz County, Arizona, by F. S. Simons (1974), USGS Miscellaneous Investigations Series Map I-762 (link downloads a kmz file).
Pending your webmaster finding a good way to share the legend for the color-coding on these maps, you’ll have to go to the source:
For the general stratigraphic definitions covering the area (which the above publications may or may not be consistent with), go to New and Revised Stratigraphic Names in the Santa Rita Mountains of Southeastern Arizona by Harald Drewes (1968), USGS Bulletin 1274-C.