1University of Kansas, Department of Geology, Lawrence, Kansas 66049, U.S.A.; present address: Indiana University, Department of Geology, 1001 East 10th Street, Bloomington, Indiana 47405, U.S.A.;
2University of Kansas, Department of Geology, Lawrence, Kansas 66049, U.S.A.
3115 W. Kane Creek Boulevard, # 29, Moab, Utah 84532, U.S.A.