1. School of Geology and Geophysics, University of Oklahoma, 100 E. Boyd Street, SEC 710,
Norman, Oklahoma 73019, United States
2. Department of Earth Sciences, VU University Amsterdam, De Boelelaan 1085, NL-1081
HV Amsterdam, The Netherlands
3. GSI Environmental Inc., 2211 Norfolk Street, Suite 1000, Houston, Texas
77098, United States