Correlation of the Upper Cretaceous strata of Wyoming

This is a geochronologic correlation chart for Upper Cretaceous strata of Wyoming, subdivided by basin. Strata are correlated to radiometric age, U.S. Western Interior ammonite biozones, U.S. Western Interior inoceramid biozones, and North American land vertebrate ages and U.S. Western Interior palynostratigraphic biozones when appropriate.