Dear Colleagues: I am interested in general references on the recent advances in radiometric dating of various minerals in shear zone fabrics. Does anyone know of any such references? I would greatly appreciate any ideas that you might have. Best regards, Eldridge -- Distinguished Professor of Emeritus of Geology Vice President, International Union of Geological Sciences Department of Geology, University of California One Shields Avenue Davis, CA 95616 Tel: 530-752-0352 Fax: 530-752-0951 "Civilization exists by geologic consent, subject to change without notice" "Civilization is an interval between ice ages" (Will Durant)