Geological Survey of Great Britain (England and Wales) Great Britain. Ordnance Survey. Sheet 348 drift. North Decimal Degree 50.4833. South Decimal Degree 50.3167. East Decimal Degree -4.1333. West Decimal Degree -4.5333. Relief shown by contour interval and spot heights.Transverse Mercator projection. National grid system. Depth is shown by contour interval. "Original Geological Survey on the one-inch scale, by Sir H.T. De la Beche, C. B. F.R.S. Published on Sheets 24 and 25 Old Series. Resurveyed, on the six-inch scale by W. A. E. Ussher et al. Boundaries revised to December 1898. Railways inserted to March 1906.".