In view of the context, would that be "dhustone" from Clee Hill, used for the quays at Swansea? Mike Dr M Worsfold, Principal Scientist, Charles Salt Research Centre -----Original Message----- From: graham owens [mailto:[log in to unmask]] Sent: 05 January 2005 12:06 To: [log in to unmask] Subject: Re: Culver Quoting "Reynolds P.R." <[log in to unmask]>: > > Can anyone provide other instances of 'culver' being used in a coal-mining > context? > According to the US Bureau Of Mines - A dictionery of mining and related terms (1968):- CULVER - Somerset. A blue stone used for steps. Arkell (Arkell, W.J., and S.I. Tomkeiff. English Rock Terms Chiefly As Used by Miners and Quarrymen. Oxford University Press, 1953 Hope of some relevence! Graham