Map record details

Map series Geological Survey of England and Wales 1:63,360/1:50,000 geological map series, New Series 
Sheet number 214 
Sheet title Talgarth. 
Map type Solid and Drift 
Scale 1:50 000 
Publication year 2003 
Author statement Original survey at one inch scale (Old Series Sheet 42) by W.T. Aveline, H.T. de la Beche, T.E. James, W.E. Logan, J. Rees and D.H. Williams. Published 1845-1857. Compiled by P.R. Wilby, W.J. Barclay and D. Wilson, incorporating data from the sources indicated below. Linework derived mainly from air photograph interpretation by P.R. Wilby with limited field reconnaissance. Digital photogrammetry by D.G. Tragheim and E.A. O'Connor. Local details supplied by D. Hawley, University of Wales, Swansea and R.B. Williams. P.J. Strange, Regional Geologist. 
Published statement Released 2003. 
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