This guidebook was prepared for a field trip following the Ninth International Congress of Carboniferous Stratigraphy and Geology held at Urbana, Illinois, May 21-26, 1979. The field trip involved seven days and concentrated on the stratigraphy and paleontology of the upper Paleozoic, mainly Carboniferous strata in the Grand Canyon and Mogollon Rim of northern Arizona and the Spring Mountains and Aaron Canyon Ranges of southern Nevada.
The Carboniferous sections in Grand Canyon and southern Nevada are among the best known and most sedimentary environments reflecting a transition from the continental shelf to the Cordilleran geosyncline of the late Paleozoic. Numerous recent studies of Carboniferous lithostratigraphy and biostratigraphy in this region have added considerable detail and refinement to our understanding of the paleogeography of this region. This guidebook provides a summary of the present state of knowledge and, we hope, will suggest areas for further research.
We express appreciation to the researchers who have contributed papers to this guidebook and have assisted in the preparation of the road logs. Special thanks are extended to Edwin D. McKee, Ray C. Douglass, and Ivo Lucchitta of the U.S. Geological Survey and John J. Matthews of Union Oil Company, for consultation regarding many geologic details of the field trip. Financial aid in photographic documentation of the Nevada road logs was provided by the University of Illinois Graduate Research Board.