Smith JJ, Platt BF, Ludvigson GA, Sawin RS, Marshall CP, Olcott-Marshall A. Enigmatic Red Beds Exposed at Point of Rocks, Cimarron National Grassland, Morton County, Kansas: Chronostratigraphic Constraints from Uranium-Lead Dating of Detrital Zircons. kgsbulletin. 2015;(261):1-17. doi:10.17161/kgsbulletin.no.261.20364