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HIGH PLAINS WATER- LEVEL MONITORING STUDY Home Physical and Cultural Setting Generalized Geology and Hydrogeology Publications Download Water-Level Data Related Links Contact Us [an error occurred while processing this directive] HPWLMS Intranet ASSOCIATED USGS OFFICES AND PROGRAM Colorado Kansas Nebraska New Mexico Oklahoma South Dakota Texas Wyoming Ground-Water Resources Program

High Plains Aquifer Water-Level Monitoring Study Geologic units of the High Plains aquifer Geologic units of the High Plains aquifer *   Location where geologic unit is a substantial part of the High Plains aquifer Geologic unit comprising the aquifer System (series) and High Plains aquifer comprising millions of years before present Composition CO KS NE NM OK SD TX WY Valley-fill and alluvial deposit Quaternary (Holocene and Pleistocene), 1.8 to present A   X X X         Dune sand Quaternary (Holocene), 0.008 to 0.0015 B   X X           Ogallala Formation Tertiary (Miocene), 19 to 5 C X X X X X X X X Arikaree Group Tertiary (Miocene and Oligocene), 29 to 19 D     X     X   X Brule Formation Tertiary (Oligocene), 31 to 29 E X   X         X Composition: A = Clay, silt, sand, and gravel, unconsolidated B = Sand, very fine to medium-grained, windblown C = Clay, silt, sand, and gravel, generally unconsolidated; where cemented by calcium carbonate, mortar beds formed D = Sandstone, very fine to fine-grained, with beds of volcanic ash, silty sand, and sandy clay E = Siltstone, massive, with beds of sandstone, volcanic ash, and clay * Table modified from Dugan and others, 1994

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