1. Department of Earth and Environmental Sciences, University of Kentucky, 101 Slone Research Building, Lexington, Kentucky 40506‐0053 U.S.A., woolery@uky.eduazal222@g.uky.edu
2. Schnabel Engineering, 11 A Oak Branch Drive, Greensboro, North Carolina 27407 U.S.A., jwhitt@schnabel-eng.com
3. Also at Department of Earth and Environmental Sciences, University of Kentucky, Lexington, Kentucky 40506 U.S.A.
4. Department of Earth Sciences, University of Memphis, 109 Johnson Hall, Memphis, Tennessee 38152 U.S.A., rvanrsdl@memphis.edu
5. Also at Department of Geology, University of Basra, Basra 61004, Iraq.