Great Britain. Ordnance Survey of England. Great Britain. Geological Survey of England and Wales. Sheet 228 solid. Geological Survey of Great Britain. North Decimal Degree 51.866700. South Decimal Degree 51.7000. East Decimal Degree -4.5833. West Decimal Degree -5.0000. In upper left corner: Ordnance Survey of England and Wales (Third Edition). Relief shown by contour interval and spot heights.Transverse Mercator projection. National grid system. Depth is shown by contour intervals. "Original geological survey on the Old Series One Inch Map Sheet 38 and 40 and published 1845. Some revision in 1857. Resurveyed on the six-inch scale by A. Strahan et al. Published with Drift 1920.