Geological Survey of Great Britain (England and Wales) Great Britain. Ordnance Survey. Sheet 324 solid and drift. North Decimal Degree 50.8333. South Decimal Degree 50.6667. East Decimal Degree -3.7333. West Decimal Degree -4.1333. Relief shown by contour interval and spot heights.Transverse Mercator projection. National grid system. "Original geological survey on the one inch scale by Sir Henry De la Beche on Old Series Sheets 25 and 26; published 1835, revised 1839, some additions to Sheet 25 in 1866. Resurveyed on the six-inch scale in 1962-3 by E.A. Edmonds et al. Petrological investigations by J. R. Hawkes.".