Physical Sciences and Mathematics Commons^™

Geology And Ground-Water Resources Of Northern Lea County, New Mexico, Sidney R. Ash

Earth and Planetary Sciences ETDs

The economy of northern Lea County is dependent upon groundwater; the only other source of water is the runoff from precipitation that is caught and retained in the man-made or natural reservoirs, where is it used for water stock. Irrigation utilizes most of the groundwater pumped; much smaller amounts are used for stock watering and industrial, public, rural and domestic supplies. In 1958, about 107,000 acre-feet of groundwater was pumped for irrigation and 19,000 acre-feet was pumped for all other uses. On the basis of present production of potable water, the economically usable supply will be depleted in certain areas …

Petrology Of The Precambrian Rocks Of Part Of The Monte Largo Area, Nm, Paul Wayne Lambert

Earth and Planetary Sciences ETDs

Approximately 7 to 8 square miles of Precambrian rocks are exposed in the vicinity of the Monte Largo Hills in north-central New Mexico. The Precambrian rocks are bounded mainly by Pennsylvanian sedimentary rocks in both fault and noncomformable contact.

The area is made up largely of quartz-feldspar gneiss, hornblende gneiss, and quartzite. Quartz-feldspar gneiss is the most abundant rock type. Mica schist and sillimanite hornfels occur in minor amounts. Other Precambrian rocks include medium-grained granite, splite and pegmatite dikes, and quartz veins. A minor amount of migmatite is present as a result of the intimate association of quartz-feldspar gneiss and …