Magnetostratigraphy of Upper Cretaceous (Maastrichtian) to lower Eocene strata of the Denver Basin, ColoradoDOI: info:10.2113/gsrocky.38.1.1v. 38No. 11–27
Hicks, Jason F., Johnson, Kirk R., Obradovich, John D., Miggins, Daniel P., and Tauxe, Lisa. 2003. "Magnetostratigraphy of Upper Cretaceous (Maastrichtian) to lower Eocene strata of the Denver Basin, Colorado." Rocky Mountain Geology, 38, (1) 1–27. https://doi.org/10.2113/gsrocky.38.1.1.