1. Cretaceous stratigraphy in a northeast-trending transect, northern Utah to south-central South Dakota Author/Creator: Geological Survey (U.S.) Publication/Creation: Denver, CO : For sale by USGS Information Services Resource Type: Map Access & Availability: Loading
2. Biostratigraphic data from Upper Cretaceous formations--eastern Wyoming, central Colorado, and northeastern New Mexico Author/Creator: Merewether, E. A. 1930- (Edward Allen) Publication/Creation: [Reston, VA] : U.S. Dept. of the Interior, U.S. Geological Survey, 2011 Resource Type: Map Access & Availability: Loading