LUDVIGSON, G.a., Kansas Geological Survey, University of Kansas, Lawrence, KS 66047, GONZÁLEZ, Luis A., Department of Geology, University of Kansas, Lawrence, KS 66045-7613, SUAREZ, Marina, Dept. of Geological Sciences, U. of Texas, San Antonio, 1 UTSA Circle, San Antonio, TX 78249, JOECKEL, R.M., School of Natural Resources and Department of Earth and Atmospheric Sciences, University of Nebraska Lincoln, Lincoln, NE 68583, KIRKLAND, J.I., Utah Geological Survey, Salt Lake City, UT, YOU, Hailu, Institute of Geology, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing, 100037, China, SUAREZ, Celina, Department of Geosciences, University of Arkansas, 113 Ozark Hall, Fayetteville, AR 72701 and MURPHY, Laura, Kansas Geological Survey, 1930 Constant Ave, Lawrence, KS 66047-3726, gludvigson@kgs.ku.edu, gludvigson@kgs.ku.edu