Thanks, Bill, that does clear things, and does fit with what I could make out. But, please make something else up...I just love it when you do that! <g> Tara -- ______________________________________________________ Tara Deen School of Earth Sciences Division of Geology and Geophysics Building FO5 University of Sydney NSW 2006 Phone: 61-2-9351 4271 Fax: 61-2-9351 0184 email: tara@es.usyd.edu.au ______________________________________________________