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Bernard Please go back and read your books again and you will find that by the time iron is recovered from marine sites it is no longer iron but iron oxide. The sea is a very poor environment for the survival of iron, and artefacts are usually only present as psudomorphs within a ferrous oxide concretion. They will show on xrays but if the rust is cleaned off there will be very little if anything remaining. Having spent the last four years studying archaeology i do come to this discussion with some knowledge. Martin Roe (currently studying at the Department of Archaeological Science, University of Bradford) Lead Mining in the Yorkshire Dales Web site @http://www.mroe.freeserve.co.uk _____________________________________________________________________________________ Get more from the Web. FREE MSN Explorer download : http://explorer.msn.com