Hi All, I remeber a while back some discussion pertaining to the effects of hydrothermal activity or such like and the elemental gains and loses from rock. There was some talk of ways of handling such info and its display. I carefully saved these messages and then carelessly reformatted my entire system and lost everything. Is there anyone out there who recalls this......? Cheers, Malc. -- Dr MP Roberts Phone: [+27](0)46 603 8313 (work) Dept of Geology [+27] (0)46 6361197 (home) Rhodes University Fax: [+27](0)46 622 9715 6140 Grahamstown Cell: 083 4060 262 SOUTH AFRICA e-mail: [log in to unmask]