This map was produced in ArcGIS using a scan of Roy Bailey's beautiful geologic map of Long Valley caldera, California (Bailey, R. A., 1989, Geologic map of the Long Valley caldera, Mono-Inyo Craters volcanic chain, and vicinity, eastern California: U. S. Geological Survey Map I-1933, scale 1:62,500). Thanks to Dave Soller and the USGS for the scan.
