Geological Survey of Great Britain. Great Britain. Geological Survey of England and Wales. Sheet 318 drift. Great Britain. Ordnance Survey of England. North Decimal Degree 50.9833. South Decimal Degree 50.8000. East Decimal Degree -0.0333. West Decimal Degree -0.4333. 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 in 1864. First edition, New Series, published 1924. The greater part of the Lower Greensand re-surveyed on the six-inch scale by J. F. Kirkaldy, and parts of the Gault, Upper Greensand and Calk by C.T.A Gaster and A. J. Bull, 1933-1936. Additions by F. H. Edmunds, S. C. A. Holmes and B. Smith Sc.D., F.R.S. (Director), 1936.".