field trip leader, Gary S. Rasmussen ; field trip committee, David B. Ebersold, Gary S. Rasmussen, Christopher J. Sexton ; guidebook compiled and edited by David B. Ebersold
by Tom Simkin ... [and others] ; cartography and graphic design by Will R. Stettner, with contributions by Antonio VillaseƱor, and edited by Katharine S. Schindler ; U.S. Department of the Interior, U.S. Geological Survey ; prepared in cooperation with the Smithsonian Institution and the U.S. Naval Research Laboratory