Horizontal Section No. 39 (1855). From Areneg-fawr to the Coal Measures near Wrexham. Geological Survey of GB. 2ndHorizontal Section No. 39 (1855). From Areneg fawr to the Coal Measures near Wrexham. Geological Survey of GB. 2nd edition. Located on Old Series one inch maps 75se, and 74nw, ne, & ssw. Hand coloured engraving 69 x 101cm, 1: 10,560 scale (6= 1mile). Flat, linen taped edge, age toned, library stamp on back. Bright colours (coloured 1919). Right margin soiled, otherwise clean. Publication details, including the year, were omitted on some of the