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Just one further thought... (well two actually) Joep wrote: >At the bottom of the shaft some roman-age pottery sherds were found. >On these sherds there is a thick (5 mm) layer of glass. >The area is known to be intensively used in the Roman era and there has >been glass-making industry (Roman aged) in that region. >The stone "Gaize" is very fire-resistant. If the mining was for lime to be burned for agricultural uses, would the temperature be high enough to make a kind of glass as a by-product? Would a glass-covered piece of pottery make a good digging tool? Adrian (North Wales Caving Club) -- Adrian Farrel mailto:[log in to unmask] Data Connection Ltd., Chester, UK http://www.datcon.co.uk/ Tel: +44 (0) 1244 313440 Fax: +44 (0) 1244 312422 > > %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%