Salt Lake City, UT: Utah Geological Society, 1970. Paperback. 156pp. Octavo [23 cm] Yellow and black printed wraps. Very good. The covers are lightly soiled. The corners of the covers are slightly creased. There is a faint erased previous owner's name on the front cover. There is a brief notation in pencil on the title page. With the plate in the rear pocket. The plate is in very good condition. Item #37353
Many illustrations. From the Introduction- "Geologically, the significance of the Canyon has been realized since the courageous journeys of Powell a century ago. Nowhere is there exposed a better view of the earth's crust through the sedimentary veneer into the underlying metamorphic basement complex. Although the grandeur of the geology in the National Park is world famous, the region of the Canyon to the west displays a late Cenozoic history of volcanism and tectonism not widely appreciated. It is the purpose of this guidebook to summarize what is currently known of the western Grand Canyon region."