Geological Survey of Great Britain (England and Wales) Great Britain. Ordnance Survey. Sheet 330 drift. North Decimal Degree 50.8333. South Decimal Degree 50.6500. East Decimal Degree -1.2667. West Decimal Degree -1.6833. Relief shown by contour interval and spot heights.Transverse Mercator projection. National grid system. "Original Geological Survey on the one-inch scale by H. W. Bristow, F.R.S. Published, on Sheets 10, 11, 15, 16 Old Series, 1855-1858. Resurveyed on the six-inc scale by Clemeber Reid (Tertiary) and Aubry Strahan (Cretaceous). Publishted with Drift, 1893. Reprtined 1963 with new Horizontal and Vertical Sections by F. H. Edmunds.".