“…The Bernal Formation is named for exposures of fine-to medium-grained brownish-red sandstone, siltstone and red to purple shale that crop out in the southern Sangre de Cristo Mountains near the village of Bernal (Bachman, 1953;Baltz, 1965). It is correlative with the Artesia Group of southeastern New Mexico (Tait et al, 1962). In the subsurface of the Las Vegas Basin, the Bernal consists of fine-to medium-grained, moderately sorted, light-to medium-gray sandstone and interbedded dark-red to maroon silty shales.…”