VAN ROY, Peter, Department of Geology and Geophysics, Yale University, PO Box 208109, New Haven, CT 06520-8109, peter.vanroy@yale.edu

KNECHT, Brian¹, HEGNA, Thomas¹, and GARWOOD, Russell², (1) Geology Department, Western Illinois University, 1 University Circle, 113 Tillman Hall, Macomb, IL 61455, bj-knecht@wiu.edu, (2) School Of Materials / School of Earth, Atmospheric, and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, United Kingdom

HEGNA, Thomas, Geology Department, Western Illinois University, 1 University Circle, 113 Tillman Hall, Macomb, IL 61455, ta-hegna@wiu.edu, VEGA, Francisco J., Instituto de Geologia, UNAM, Ciudad Universitaria, Coyoacan, México, DF, 04510, Mexico, and GONZALEZ-RODRIGUEZ, Katia Adriana, Instituto de Ciencias Básica e Ingeniería. Museo de Paleontología, Universidad Autónoma del Estado de Hidalgo, Centro de Investigaciones Biológicas, Ciudad Universitaria, Carretera Pachuca-Tulancingo km 4.5, Pachuca, 42184, Mexico