Geologic Map of the Western Eagletail Mountains, La Paz County, Arizona

The area described in this study includes the western Eagletail Mountains, Yuma county, Arizona and includes much of the Eagletail Mountains Wilderness Area (Figure 1). Bedrock in this area consists largely of Miocene silicic volcanic rocks and subordinate mafic and intermediate volcanic units (Plate 1). Sources of data are shown in Figure 2, rock-unit correlations and relative ages are shown in Figure 3, and map symbols are shown in Table 1. The area was mapped in part with funds provided to the Arizona Geological Survey by the U.S. Geological Survey COGEOMAP program, contract #1434-92-A-1061. Field work was carried out by the authors in the winter of 1993. The views and conclusions contained in this document are those of the authors and should not be interpreted as necessarily representing the official policies, either expressed or implied, of the U. S. Government.