Harshbarger, J.W., C.A. Repennings, and J.H. Irwin; Stratigraphy of the Uppermost Triassic and Jurassic Rocks of the Navajo Country. USGS Prof. Paper 291, Washington DC, 1957. Quarto, pp. 74, 3 folded maps in rear pocket, 38 text photos, figures, tables.
The work is complete and in the original dark brown cloth with gilt spine titles. The binding is tight a very clean, text, plates are clean and bright, USGS stamp on paste down and lower margin of title page. In near fine condition.
The authors provide a comprehensive review of the stratigraphy of the Glen Canyon Group and its fossils, the San Rafael Group, the Cow Springs formation and the Morrison formation and its members. They finish with a review of the Jurassic-Cretaceous boundary and stratigraphic sections.