Map record details

Map series Geological Survey of England and Wales 1:63,360/1:50,000 geological map series, New Series 
Sheet number 179 
Sheet title Rhayader. 
Map type Solid 
Scale 1:50 000 
Publication year 1993 
Author statement Original geological survey on the one-inch scale, published on Old Series Sheets 56 NW and SW in 1850 and 57 NE and SE in 1848. Surveyed on the 1:10 000 scale as part of the Central Wales Rapid MappingProgramme by J.R. Davies. C.J.N. Fletcher. R.A. Waters. D. Wilson. J.A. Zalasiewicz, R. Cave. A.J. Reedman and D.G. Woodhall. 1986-89.Biostratigraphy by H.F. Barron. A.W.A. Rushton. S.P. Tunnicliff and D.E. White. Geophysics by R.M. Carruthers and R.B. Evans. Crystallinity indices by R.J. Merriman and B. Roberts (Birkbeck College, University of London). R.A.B. Bazley. Regional Geologist. 
Published statement Published 1993. Print code: 93/1800. 
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