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LITERATURE CITED 105
<br /> from the alluvium. The bedrock deposits, except the Ogallala
<br /> formation, generally yield water of poor quality for irrigation or
<br /> other uses.
<br /> It is anticipated that there will be future hydrologic problems
<br /> in the project area because the number of irrigation wells drain-
<br /> ing water from a limited aquifer is steadily increasing, the water
<br /> table in parts of the area is declining at an accelerating rate, and
<br /> the mineralization of ground water in irrigated areas is increas-
<br /> ing. Therefore, hydrologic studies should be continued in the lower
<br /> South Platte River valley. The periodic measurement of water
<br /> levels in observation wells should be continued, the annual pumpage
<br /> of ground water for irrigation should be estimated, and the chem-
<br /> ical quality of water in selected wells should be determined at
<br /> intervals. Additional pumping tests should be made to obtain more
<br /> information regarding the hydrologic properties of the water--
<br /> bearing materials.
<br /> LITERATURE CITED
<br /> American Public Health Association, 1946, Standard methods for the examination of water
<br /> and sewage: 9th ed., New York, N. Y.
<br /> Blair, R. W., 1951, Subsurface geologic cross section of Mesozoic rocks in northeastern
<br /> Colorado: U. S.Geol. Survey Oil and Gas Inv. OC 42.
<br /> Brown,,R. F., 1950, Ground water in the vicinity of Brush, Colo: Colo. Water Conserv.
<br /> Board Circ. 2.
<br /> Bryan,Kirk, and Ray,L. L., 1940, Geologic antiquity of theLindenmeier site in Colorado:
<br /> Smithsonian Inst.Misc. Coll., v. 99, no. 2.
<br /> Butler, G.M., 1914, Clays of eastern Colorado: Colo. Geol. Survey Bull. 8.
<br /> Code, W. E., 1943, Use of ground water for irrigation in the South Platte River valley of
<br /> Colorado: Colo.'Agr. Expt. Sta. Bull. 483.
<br /> 1945, Ground-water supply of Prospect Valley, Colo.: Colo. Agr. Expt. Sta. Tech.
<br /> Bull. 34.
<br /> Collins, W. D., 1928, Notes on practical water analysis: U. S. Geol Survey Water-Supply
<br /> Paper 596-H.
<br /> Condra, G. E., and Reed, E. C., 1943, The geological section of Nebraska: Nebr. Geol.
<br /> Survey Bull. 14.
<br /> Condra, G. E., Reed, E. C., and Gordon, E. D., 1947, Correlation of the Pleistocene de-
<br /> posits of Nebraska: Nebr. Geol. Survey Bull. 15.
<br /> Condra, G. E., Reed, E. C., and Scherer, 0. J., 1940, Correlation of the formations of
<br /> the Laramie Range, Hartville Uplift, Black Hills, and western Nebraska: Nebr. Geol.
<br /> Survey Bull. 13.
<br /> Dane, C. H., and Pierce, W. G., 1936, Dawson and Laramie formations in the southwest-
<br /> ern part of the Denver Basin: Am. Assoc. Petroleum Geologists Bull., v. 20, p. 1308-
<br /> 1328.
<br /> Darton, N. H., 1905, Preliminary report on the geology and underground water resources
<br /> of the central Great Plains: U. S. Geol Survey Prof. Paper 32.
<br /> Dobbin, C. E., and Reeside, J. B., Jr., 1929, The contact of the Fox Hills and Lance
<br /> formations: U. S. Geol. Survey Prof. Paper 158-B.
<br /> Eldridge, G. H., 1889, On some stratigraphical and structural features of the country
<br /> about Denver, Colo.: Colo.Sci. Soc. Proc., v. 3,pt. 1,p. 86-118.
<br /> Elias,M. K., 1931, Geology of Wallace County, Kans: Kans. State Geol. Survey Bull. 18.
<br /> Hague, Arnold, and Emmons, S. F., 1877, Descriptive geology: U. S. Geol. Explor. 40th
<br /> Par. Rept., v. 2.
<br /> Henderson, Junius,-1920a, Cretaceous formations of the northeastern Colorado Plains:
<br /> Colo. Geol. Survey Bull. 19, p. 7-57.
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