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The High Plains Aquifer is made up of five geologic units: <br />Geologic <br />System (series) and time of <br />Location where geologic unit is <br />formation <br />deposition in millions of years <br />Composition <br />a substantial part of the High Plains Aquifer <br />of aquifer <br />before present <br />CO <br />KS <br />NE <br />NM <br />OK <br />SD <br />TX <br />WY <br />Valley -fill and <br />deposit <br />Quaternary (Holocene and Pleistocene), <br />1.8 <br />^ <br />A <br />v <br />x <br />x v <br />x <br />alluvial <br />million years to present <br />Dune sand <br />Quaternary (Holocene), <br />0.008 <br />p <br />B <br />v <br />x <br />x v <br />to 0.0015 million years <br />Ogallala <br />Formation <br />Tertiary (Miocene), <br />19 to 5 million years <br />C <br />v <br />/� <br />v <br />/� <br />v <br />/� <br />v <br />/� <br />v <br />/� <br />v <br />/� <br />Ix <br />v <br />/� <br />Arikaree Group <br />Tertiary (Mioceneand Oligocene), <br />29 to 19 <br />D <br />v <br />v <br />Ix <br />million years <br />/� <br />Brule I <br />Formation <br />Tertiary (Oligocene), <br />31 to 29 <br />r <br />C <br />" <br />J� <br />Jx <br />million ears <br />Composition: <br />A = Clay, silt, sand, and gravel, unconsolidated. <br />B = Sand, very fine to medium grained, windblown. <br />C = Clay, silt, sand, and gravel, generally unconsolidated; where cemented by calcium carbonate, mortar beds formed. <br />D = Sandstone, very fine to fine grained, with beds of volcanic ash, silty sand, and sandy clay. <br />E = Siltstone, massive, with beds of sandstone, volcanic ash, and clay. Source: USGS, URL 1 <br />High Plains Aquifer conceptual geologic cross sections: <br />Vedan <br />errata are Lraeenrenl <br />rocks , <br />NO HORIZONTAL OR VERTICAL SCALE <br />High Plains Aquifer Conceptual N -S Cross-section <br />/ ApproArimle laird estate I <br />Olele Various ' <br />C Famalion strata arMU Daee�ingrt <br />rocks ©l <br />Varian nine" deposits, <br />dune sands. , and <br />uncor"Maw skmal NO HORIZONTAL OR VERnCAL SCALE <br />COLORADO <br />TEXAS <br />Source: Gutentag, et. Al., 1984 <br />2.18 High Plains States Groundwater Demonstration Program <br />