C. A. Cooper, Desert Research Insti

C. A. Cooper, Desert Research Institute, 2215 Raggio Parkway,
Reno, NV 89512-1095, USA. (clay@dri.edu)
R. J. Glass, Flow Visualization and Processes Laboratory, Sandia
National Laboratories, P.O. Box 5800, Albuquerque, NM 87185-0735,
USA.
S. W. Tyler, Department of Geological Sciences, University of Nevada,
Reno, Reno, NV 89557-0180, USA. (styler@unr.edu)
(Received July 14, 2000; revised March 28, 2001;
accepted April 24, 2001.)