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2. Ash, S. R., ed., 1974, Guidebook to the Devonian, Permian, and Triassic plant localities of east-central Arizona: Paleobotany Section of the Botanical Society of Americe, 63 p.
3. Petrified Forest; The story behind the scenery Petrified Forest National Park;Ash;Arizona, Petrified Forest Museum Association,1986
4. Mesozoic Paleogeography of west-central United States, Rocky Mountain Paleogeography Symposium 2 Rocky Mountain Section;Blakey,1983
5. Investigations in the Triassic Chinle Formation;Breed;Museum of Northern Arizona Bulletin 47,1972