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
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