Geological Survey of Great Britain (England and Wales) Great Britain. Ordnance Survey. Sheet 326/340 drift. North Decimal Degree 50.8333. South Decimal Degree 50.6667. East Decimal Degree -2.9167. West Decimal Degree -3.3167. Relief shown by contour interval and spot heights.Transverse Mercator projection. National grid system. Depth shown by contour intervals. "Original Geological Survey on the one-inch maps 21 and 22, by Sir H. T. De al Beche C.B., F.R.S. Resurveyed on the one-inch odl series maps by H. B. Woodward et al, 1873-6, and the geology transferred to the new series mpas, with additions by A. J. Jukes-Browne, 1894-5.".