Horizontal Section No. 31 (1880). From Menai Straits across Y Glyder-fawr, Moel Siabod, Bala Lake, Corndon Hill. Geological Survey of GB. 2nd
Horizontal Section No.31 (1880). From the suspension bridge, Menai Straits across Y Glyder-fawr, Moel Siabod, Bala Lake, Corndon Hill. Geological Survey of GB. 2nd edition. Located on Old Series one-inch maps 74nw & sw, 75ne, and 78se. Hand-coloured engraving 70 x 101cm, 1:10,560 scale (6”= 1mile). Flat. Flat, linen-taped edge, age-toned, library stamp on back. Bright colours (coloured 1923). In very good condition.
About England & Wales Sections
These hand-coloured engraved ‘horizontal’ sections at six inch to one mile scale were published in the mid 19th century by the Geological Survey of England and Wales. The detailed profiles generally follow the geological dip on the one inch Old Series maps numbered in the upper right hand margin and the profile locations are shown on these maps which themselves did not include a section.