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• 08:43, 13 April 2022 Scotfot talk contribs uploaded File:GA Image 0497.jpg (Figure 63 Section along the new line from Pinner to Rickmansworth.. The level of the line is approximately (from Aneroid measurements) 190 feet above ordnance datum at Pinner, 230 feet at the highest point near Grove Green, and 200 feet at Moor Farm. a. Alluvium. b. Brick Earth. c. London Clay. d. Reading Beds. e. Chalk. {{Template:GA excursions1860-1890}} == Licencing == {{GA}})