Author Affiliations +
Sally E. Walker,1 Kathy M. Nichols,2 David Rohr3
1Department of Geology, University of Georgia, Athens, Georgia 30602, USA ⟨ ⟩ swalker@gly.uga.edu
2Consulting Geologist, 1235 Estes Street, Lakewood, Colorado 80215, USA ⟨ ⟩ slbring@comcast.net
3Department of Earth & Physical Sciences, Sul Ross State University, Alpine, Texas 79832, USA ⟨ ⟩ drohr@sulross.edu