. Water resources of the Rio Grande Valley in New Mexico and their development . A. LAVA-CAPPED MESA AT SAN MARCIAL. The sheet of basalt resting upon the sand and gravel is the edge of the great flow covering the northend of the Jornada del B. SIDE GORGE AT THE ENTRANCE TO WHITE ROCK CANYON, NEAR ESPANOLA DAM colunnnar basalt in the foreground, and the rhyolite west of the river in the background. GEOLOGY, IGNEOUS ROOKS. 17 The detritus has a great, though unknown thickness. A well at SantaFe penetrates it nearly 1,000 feet; another at Sandia, N. Mex., 893 feet;one at Lan
. Water resources of the Rio Grande Valley in New Mexico and their development . A. LAVA-CAPPED MESA AT SAN MARCIAL. The sheet of basalt resting upon the sand and gravel is the edge of the great flow covering the northend of the Jornada del B. SIDE GORGE AT THE ENTRANCE TO WHITE ROCK CANYON, NEAR ESPANOLA DAM colunnnar basalt in the foreground, and the rhyolite west of the river in the background. GEOLOGY, IGNEOUS ROOKS. 17 The detritus has a great, though unknown thickness. A well at SantaFe penetrates it nearly 1,000 feet; another at Sandia, N. Mex., 893 feet;one at Lanark, west of Mesilla Valley, 945 feet; and one in a neighbor-ing basin,^ near El Paso, 2,285 feet, but in none of these wells has bedrock been reached. Where the older and partly cemented beds havebeen upturned and exposed to view in Arroyo Salado, they have anobserved thickness of several thousand feet. Their character is indi-cated in PI. V, A, B. The younger or unceniented sands and gravelsare well exposed in the terraces on either side of the river. IGNEOUS ROCKS. The igneous formations that are important in a discussion of thewater supply are principally of Tertiary and Quaternary age, andoccur in the form of massive flows, beds of tuff
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