1. Geologic Map of the Jefferson Quadrangle, Park and Summit Counties, Colorado:;Barker;U.S. Geological Survey Geologic Quadrangle GQ 1345,1976
2. Barkmann, P.E. Sebol, L. Fitzgerald, F.S. Curtiss, W. , 2015, Geology and Groundwater Resources of Park County, Colorado: Colorado Geological Survey Open File Report 15-11, http://coloradogeologicalsurvey.org/water/groundwater/park-county-ground-water-study/.