The Davis Mountains are located south of the junction of 1-10 and 1-20 and northwest of Alpine, predominantly in Jeff Davis County, southwestern Texas. The 14 field localities described here are keyed to the schematic cross sections of Figure 1. The field localities vary from roadcut exposures to hillside exposures to scenic panoramas; all were chosen to elucidate important features of Davis Mountains geology. A brief description of the location, the rock units involved, and chief references are given for each locality. K-Ar ages on Figure 1 were recalculated from Parker and McDowell (1979), using new standard decay constants (Steiger and Jager, 1977).