. Water resources of the Rio Grande Valley in New Mexico and their development . TERTIARY STRATA IN ARROYO SALADO AT THE BASE OF SIERRA B. CANYON IN TERTIARY SEDIMENTS WEST OF SAN ACACIA, N. MEX. TOPOGRAPHIC DEVELOPMENT. IV) abruptly on the west by great faults which are plainly exposed andtraceable for longd istances. (See PL VII.) Cerro Robledo furnishesa characteristic type of structure. (See PL III.) East of the riverCarboniferous limestone, dipping westward, passes beneath the RioGrande Valley. The same limestone occurs in the hills to the west2,000 feet above the river, the diff
. Water resources of the Rio Grande Valley in New Mexico and their development . TERTIARY STRATA IN ARROYO SALADO AT THE BASE OF SIERRA B. CANYON IN TERTIARY SEDIMENTS WEST OF SAN ACACIA, N. MEX. TOPOGRAPHIC DEVELOPMENT. IV) abruptly on the west by great faults which are plainly exposed andtraceable for longd istances. (See PL VII.) Cerro Robledo furnishesa characteristic type of structure. (See PL III.) East of the riverCarboniferous limestone, dipping westward, passes beneath the RioGrande Valley. The same limestone occurs in the hills to the west2,000 feet above the river, the difference in altitude being due tofaulting and the tilting of the Cerro Robledo block. Displacements by faults much greater than that at Cerro Robledoare evident at a number of places. The western face of the CaballosMountains(seePL VI, 5) and the Fra Cristobal Mountains (PL VII)are fault scarps, and Cerro Cuchillo is an excellent example of a tiltedblock. With the exception of the Jornada del Muerto, the Rio Granderegion may be properly said to consist of a series of block mountainswith troughlike depressions intervening betw^een them. TOPO
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