Overview of the Late Cretaceous, early Paleocene, and early Eocene megafloras of the Denver Basin, ColoradoDOI: info:10.2113/gsrocky.38.1.101v. 38No. 1101–120
Johnson, Kirk R., Reynolds, Michele L., Werth, Kevin W., and Thomasson, Joseph R. 2003. "Overview of the Late Cretaceous, early Paleocene, and early Eocene megafloras of the Denver Basin, Colorado." Rocky Mountain Geology, 38, (1) 101–120. https://doi.org/10.2113/gsrocky.38.1.101.