Dear Dr. Lee It is so great to learn "Symposium on Geochronology in Clays, Zeolites, and Oxides" will be hold in June 6-10, 1998. I am very interesting this symposium since I am working on geochronology in clays. My research projects are focused on ash fall events, its geochronology and environmental change from Early to Later Paleozoic in South China. The early bantonite layers were found near "Cambrian Exploding" and Cambrian/Precambrian (A, B, C et al. point). The later bantonite layers bounded Permian-Triassic. Please send me detail information about the Symposium if it is convenient for you. Wei WANG out***************************************************** * Wei WANG Ph.D * * Nanjing Institute of Geology and Paleontology * * Chinese Academy of Sciences * * Chi-Ming-Ssu, Nanjing, 210008 * * China * * Phone:86-25-7714443 (O) 86-25-5400086(H) * * Fax:86-25-3357026(O) * * E-Mail:[log in to unmask] * *****************************************************