Water resources of Antelope County, Nebraska

Interpretation of hydrogeologic data to support groundwater management, Bazile Groundwater Management Area, northeast Nebraska, 2019—A case demonstration of the Nebraska Geocloud

“…The Ogallala Formation is the principal geologic unit in the High Plains aquifer system and is thickest in Antelope County (Souders and Shaffer, 1969). The Ogallala Formation consists of a poorly sorted mixture of sand, silt, clay, and gravel (Condra and Reed, 1943) and is generally unconsolidated or weakly consolidated but can contain layers of sandstone cemented by calcium carbonate or limestone.…”

“…The Ogallala Formation was deposited by aggrading streams that filled paleovalleys, which were eroded into pre-Ogallala Formation rocks (Swinehart and others, 1985). The base of the Ogallala Formation is (Souders and Shaffer, 1969) and pinches out in northeast Antelope County, northwest Pierce County, and southeast Knox County. The Ogallala Formation has been eroded away along Verdigre Creek in Knox County (Burchett and others, 1988;Cannia and others, 2017b;Diffendal and others, 2008).…”

“…Many geologic and groundwater studies have included all or parts of the BGMA, including Condra and Reed (1943), Souders and Shaffer (1969), Stanley and Wayne (1972), Gutentag and others (1984), Helgesen and others (1993), Miller and Appel (1997), McGuire and Peterson (2008), Hobza and others (2012), Houston and others (2013), Korus andothers (2013), andStanton (2013). Geologic bedrock maps covering the BGMA have been published by Burchett and others (1988) and Diffendal and others (2008) at the 1:250,000 scale.…”