. Water resources of the Rio Grande Valley in New Mexico and their development . Central area (pp. 9-16),where it is shown that the face of the Fra Cristobal and Caballosmountain ranges (see PL VII) are due to faulting and that the detri-tal valleys are due to the filling of the troughs thus formed with rockdebris. The structure is illustrated in detail in the Elephant Buttearea, a map and cross section of which are given in PL VIII. Thefault at the western base of the mountains passes through this region,separating the unconsolidated detrital beds to the west from the rockformations to the ea
. Water resources of the Rio Grande Valley in New Mexico and their development . Central area (pp. 9-16),where it is shown that the face of the Fra Cristobal and Caballosmountain ranges (see PL VII) are due to faulting and that the detri-tal valleys are due to the filling of the troughs thus formed with rockdebris. The structure is illustrated in detail in the Elephant Buttearea, a map and cross section of which are given in PL VIII. Thefault at the western base of the mountains passes through this region,separating the unconsolidated detrital beds to the west from the rockformations to the east. The rocks, consisting mainly of UpperCretaceous sandstones and shales, are more or less fractured nearthe fault and incline in a general easterly direction, the dip varyingfrom about 10° to 90°. The high lava-covered surface, shown at the right in the sectionPL VIII and in the distance in PL IX, is the western edge of the Jornadadel Muerto. About 300 feet below this level and 150 feet above theriver a broad terrace is cut in the sandstones east of the fault line and in.
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