Geological Survey of Great Britain. Great Britain. Geological Survey of England and Wales. Sheet 320 drift. Great Britain. Ordnance Survey of England. North Decimal Degree 50.9667. South Decimal Degree 50.7833. East Decimal Degree 0.7833. West Decimal Degree 0.3833. In upper left margin: Ordnance Survey of Great Britain. 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, published on Sheets 4 and 5, Old Series, in 1864. Second Edition in 1893. Transferred to the New Series Map and published in 1928.".