Leith, C. K., Richard J. Lund, and Andrew Leith; Pre-Cambrian Rocks of the Lake Superior Region. A review of newly discovered geologic features with a revised geologic map. USGS Prof. Paper 184, Washington DC, 1935. Quarto, pp. 34, folded geologic map in pocket, folded diagram in text.
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 title page. In near fine condition.
The authors provide a detailed review of the Cretaceous, Ordovician and Cambrian rocks, the Keweenawan series, Huronian series, and basement complex and their correlation, then provide a new correlation of parts of the Huronian, and describe three periods of granitic intrusion. They finish with a description of the iron formation and its oxidation.