Geological Survey of Great Britain (England and Wales) Great Britain. Ordnance Survey. Sheet 327 solid. Geological Survey of Great Britain. North Decimal Degree 50.8333. South Decimal Degree 50.6667. East Decimal Degree -2.5000. West Decimal Degree -2.9000. 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 scale by H. W. Bristow, published partly on Sheet 17 Old Series in 1850 and 1855 and partly on Sheet 18 Old Series in 1850 and 1875. Partly resurveyed on the six-inch scale between 1890 and 1901 by A Strahan et al. Resurvey of whole Sheet between 1931 and 1936 by F. B. A Wlech et al.".