Great Britain. Geological Survey of England and Wales. Great Britain. Ordnance Survey of England. Sheet 351/358 solid and drift. North Decimal Degree 50.2667. South Decimal Degree 50.0000. East Decimal Degree -5.3333. West Decimal Degree -5.7333. Relief shown by contour interval and spot heights.Transverse Mercator projection. National grid system. Depth is shown by contour interval. Inset: Wolk Rock Lighthouse. "Original Geological Survey on the one-inch scale, by Sir H.T. De la Beche, C. B. F.R.S. Published on Sheet 33, Old Series. Geological Survey on the six-inch scale by Clement Reid, et al.".