Map record details

Map series Geological Survey of England and Wales 1:63,360/1:50,000 geological map series, New Series 
Sheet number 164 
Sheet title Llanidloes. 
Map type Bedrock and Superficial 
Scale 1:50 000 
Publication year 2010 
Author statement Original geological survey at 1:63 360 scale by W.T. Aveline, H.W. Bristow, A.C. Ramsay and A.R. Selwyn. Published as parts of Old Series sheets 56, 57, 59 and 60 in 1848 and 1850. Central Wales Mining Field surveyed at 1:10 560 scale by O.T. Jones (University of Wales) in 1917-18, and part resurveyed by D. Williams in 1940. Small areas along the western and eastern margins of the sheet surveyed at 1:10 560 scale by R. Cave between 1965 and 1972. Southern margin surveyed at 1:10 000 scale by R. Cave, J. R. Davies, C.J.N. Fletcher, A.J Reedman and R.A. Waters between1986 and 1989. Resurveyed at 1:20 000 scale by J.A. Aspden, C.E. Burt, J.R. Davies, M. Hall, N.S. Jones, A.B. Leslie, T.H. Sheppard, P.R. Wilby and D. Wilson in 2006 utilising previously published and unpublished data. Biostratigraphy by S.P. Tunnicliff, A. Snelling, D.E. White and J.A. Zalasiewicz. J.R. Davies, Chief Geologist Wales. 
Published statement Published 2010. Print code: 2000/2007. 
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