Author Affiliations +
GEORGE A. SANDERSON,1 GEORGE J. VERVILLE,2 JOHN R. GROVES,3 GREGORY P. WAHLMAN4
12643 E. 26th Street, Tulsa, Oklahoma 74114
28887 S. Lewis, Apt. 801, Tulsa, Oklahoma 74137
3Department of Earth Science, University of Northern Iowa, Cedar Falls 50614, < > john.groves@uni.edu
4BP Amoco, P.O. Box 3092, Houston, Texas 77253, < > wahlmagp@bp.com