Abstract
The Abiquiu quadrangle is located in north-central New Mexico, largely in Rio Ar-riba County. Tertiary volcanic and sedimentary rocks overlie pre-Tertiary rocks with angular unconformity. Oldest of the volcanics is the Chicoma formation, consisting mainly of andesite and latite flows, with a maximum thickness of several thousand feet. Tertiary sedimentaries, heretofore undifferentiated, are divided into three formations: (I) the El Rito formation, grading from talus breccia to conglomerate and sandstone, maximum thickness about 200 feet; (2) the Abiquiu tuff, consisting of more than 1,000 feet of stream-laid tuff and volcanic conglomerate, with a few small interbedded lava flows; and (3) the Santa Fe formation, consisting of a great thickness of alluvial deposits with some interbedded basalt flows. Toward the close of Tertiary time, extensive deformation by normal faulting took place. Tertiary sedimentaries were downfaulted and downwarped against pre-Tertiary rocks on the west, and against Tertiary volcan...
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