Franczyk K.J. Sedimentology, mineralogy, palynology, and depositional history of some uppermost Cretaceous and lowermost Tertiary rocks along the Utah Book and Roan Cliffs east of the Green River / K. J. Franczyk, J. K. Pitman, D. J. Nichols, 1991. - 30 p. - Текст : непосредственный.
Nichols D.J. Palynostratigraphy in relation to sequence stratigraphy,Straight Cliffs Formation(Upper Cretaceous),Kaiparowits Plateau,Utah / D.J.Nichols, 1995. - 21 p. - Текст : непосредственный.
Bulletin / US.Geol.survey. 1917-F : Palynostratigraphy of the Tullock Member(Iower Paleocene)of the Fort Union Formation in the Powder River Basin,Montana and Wyoming / D.J.Nichols,J.L.Brown, 1992. - IV,35 p. - Текст : непосредственный.