Stratigraphy and megaflora of a K-T boundary section in the eastern Denver Basin, ColoradoDOI: info:10.2113/gsrocky.38.1.45v. 38No. 145–71
Barclay, Richard S., Johnson, Kirk R., Betterton, William J., and Dilcher, David L. 2003. "Stratigraphy and megaflora of a K-T boundary section in the eastern Denver Basin, Colorado." Rocky Mountain Geology, 38, (1) 45–71. https://doi.org/10.2113/gsrocky.38.1.45.