Synopsis of the stratigraphy and paleontology of the uppermost Cretaceous and lower Tertiary strata in the Denver Basin, ColoradoDOI: info:10.2113/gsrocky.38.1.171v. 38No. 1171–181
Raynolds, Robert G. and Johnson, Kirk R. 2003. "Synopsis of the stratigraphy and paleontology of the uppermost Cretaceous and lower Tertiary strata in the Denver Basin, Colorado." Rocky Mountain Geology, 38, (1) 171–181. https://doi.org/10.2113/gsrocky.38.1.171.