Kremp, G.O.W., 1971, The Petrified Forest National Park - Field guidebook, 4th Annual Meeting of the American Association of Stratigraphic Paleontologists, Tucson, Arizona, October 13-16, 1971: Tucson, University of Arizona, Department of Geosciences, Contribution no. 9, 41 p.
Tucson, University of Arizona, Department of Geosciences, Contribution no. 9, 41 p.
Guidebook, Road Log, History, Areal, Stratigraphy, Fossil Plant, Petrified Forest Mbr - Chinle Fm - Triassic, [Newspaper sandstone bed][Newspaper Rock sandstone], Sonsela Sandstone Bed,