. Water resources of the Rio Grande Valley in New Mexico and their development . w the surface of the older gravels; one formed partlyby erosion and partly by deposition in Albuquerque Valley; and onemainly of deposition in the Jornada and La Mesa. Throughout theRio Grande region this surface, represented now by the terracedbluifs, is about 300 feet above the river, except where it has been cutdo\VTL by later erosion. THIRD VOLCANIC ERUPTION. Near the close of the second period of sedimentation extensive vol-canic disturbances occurred throughout the Rio Grande region, result-ing again in the
. Water resources of the Rio Grande Valley in New Mexico and their development . w the surface of the older gravels; one formed partlyby erosion and partly by deposition in Albuquerque Valley; and onemainly of deposition in the Jornada and La Mesa. Throughout theRio Grande region this surface, represented now by the terracedbluifs, is about 300 feet above the river, except where it has been cutdo\VTL by later erosion. THIRD VOLCANIC ERUPTION. Near the close of the second period of sedimentation extensive vol-canic disturbances occurred throughout the Rio Grande region, result-ing again in the outpouring of great sheets of basalt. The most con-spicuous of these are near San Marcial (PI. IV, A) and on La Mesa westof Mesilla Valley. The San Marcial flow, covering about 160 squaremiles, was outpoured on the Jornada del Muerto, then occupied by theRio Grande, and probably created a dam that formed a temporarylake in which were accumulated the great quantities of sand found onthe Jornada north of the lava sheet. U. S. GEOLOGICAL SURVEY WATER-SUPPLY PAPER NO. IBS PL. Vll.
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