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Ground water in the San Juan Basin, New Mexico and Colorado

Water-Resources Investigations Report 79-73

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Abstract

Principal aquifers in the San Juan Basin of New Mexico and Colorado are the Entrada Sandstone, Westwater Canyon Member of the Morrison Formation, Gallup Sandstone of the Mesaverde Group, several sandstones in the Mesaverde Group above the Gallup (Dalton Sandstone Member of the Crevasse Canyon Formation, Point Lookout Sandstone, Menefee Formation, Cliff House Sandstone), and sandstones of Tertiary age. Most ground water flows from topographically high outcrop areas toward the San Juan River and Rio Grande valley. Much of the water may move through confining layers to other aquifers or to the land surface rather than discharging directly to the streams. Transmissivities of the sandstones range from 50 to 300 square feet per day. Lowest dissolved-solids concentrations occur in or near outcrops of the sandstones and increase in the direction of groundwater flow. Concentrations range from less than 500 milligrams per liter to more than 30,000 milligrams per liter. (Kosco-USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Ground water in the San Juan Basin, New Mexico and Colorado
Series title:
Water-Resources Investigations Report
Series number:
79-73
Edition:
-
Year Published:
1979
Language:
ENGLISH
Publisher:
U.S. Geological Survey, Water Resources Division,
Description:
iv, 22 p. :ill., maps ;27 cm.