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Table 2 <br /> Sedimentary rocks of the La Plata Mountains and the corresponding hydrogeologic units <br /> of the San Juan Basin. Units associated with the Mayday and Idaho Mines are shaded. <br /> May Day Idaho Mine Complex <br /> La Plata County,Colorado <br /> Age Formation San Juan Basin Hydrologic Characteristics <br /> H dro eolo is Unit <br /> Upper Cretaceous Mancos Shale Confining Layer Well yields as much as 10 gpm <br /> Dakota Dakota Aquifer Well yields as much as 10 gpm <br /> Sandstone <br /> Upper Jurassic Morrison Morrison Aquifer Well yields as much as 25 gpm <br /> Formation <br /> Junction Creek <br /> Sandstone <br /> Wanakah <br /> Formation <br /> Entrada Not significant in Colorado <br /> Sandstone <br /> Jurassic and Upper Dolores Not considered significant in Colorado <br /> Triassic Formation <br /> Permian Cutler Formation Base of San Juan Basin <br /> Rico Formation <br /> Pennsylvanian Hermosa <br /> Formation <br /> (Sources: Eckel, 1949; Topper et. al.,2003) <br /> Wildcat Mining Corporation <br /> M-1981-185 <br />