Forster, Michael, (1831). ‘the Effects of a Basaltic Dyke of Butterknowle Colliery, two Miles NW of Cockfield [Northumberland]’, extract from Trans Nat Hist Soc of Northumberland, Durham and Newcastle. v1,

Forster, Michael, (1831). ‘Notice on the Effects of a Basaltic Dyke of Butterknowle Colliery, two Miles NW of Cockfield [Northumberland]’, extract from Transactions of the Natural History Society of Northumberland, Durham and Newcastle upon Tyne, 1831. v1, pp 44-49 + plate, a hand-coloured engraving ‘Sections the Effects of a Basaltic Dyke of Butterknowle Colliery, 28 x43cm, 1:672 scale.  Text and plate age-toned and clean. In good condition.