Name: Altitude (ft) of the Base of the Cloud Chief Formation (Rush Springs)

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Description: The base of the Cloud Chief formation was interpreted by OWRB Staff for their study of the Rush Springs aquifer released in 2018. This study revealed that the potentiometric surface extended above the Rush Springs Formation and into the overlying Cloud Chief Formation. The elevation of the base of the Cloud Chief ranges from 1350-2045 feet above mean sea level (MSL) with a mean elevation of 1700 feet above MSL. Depths to the base of the Cloud Chief formation were obtained from groundwater well completion reports across the study area and submitted to the OWRB by licensed well drillers. Control points with zero depth were added along the base of the formation as shown on surficial geologic maps published by the Oklahoma Geologic Survey (OGS). These depths were converted to elevations by subtracting them from the surface digital elevation model (DEM) raster using the 'minus' tool. Negative values were made to equal zero using the 'reclassify' tool. The resulting elevation dataset was used to interpolate the base of the formation using the inverse distance weighted (IDW) tool in ArcMap. The raster cell size is 152.4 square meters.

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Copyright Text: Oklahoma Water Resources Board – Planning & Management Division, Technical Studies Section Stanley, T.M., 2002, Geologic map of the Woodward 30’ x 60’ quadrangle, Ellis, Dewey, Roger Mills, and Woodward Counties, Oklahoma: Oklahoma Geological Quadrangle 40, scale 1:100,000. Stanley, T.M and Miller, T.M., 2004, Geologic map of the Anadarko 30’ X 60’ quadrangle, Caddo, Canadian, Custer, Grady, Kiowa, and Washita Counties, Oklahoma: Oklahoma Geological Quadrangle 58, scale 1:100,000. Stanley, T.M. and Miller, G.W, 2005, Geologic map of the Lawton 30’ X 60’ quadrangle, Caddo, Comanche, Cotton, Grady, Kiowa, Stephens, and Tillman Counties, Oklahoma: Oklahoma Geological Quadrangle 63, scale 1:100,000. Stanley, T.M., Miller, T.M., and Suneson, N.H., 2002, Geologic map of the Fairview 30’ x 60’ quadrangle, Alfalfa, Blaine, Dewey, Garfield, Kingfisher, Major, Woods, and Woodward Counties, Oklahoma: Oklahoma Geological Quadrangle 41, scale 1:100,000. Suneson, N.H. and Johnson, K.S., 1996, Geology of Red Rock Canyon State Park: Oklahoma Geology Notes, v. 56, p. 88-105.

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