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59. Barmouth, Machynlleth, NE Quad. | Ordnance Survey of Great Britain. Geological Survey of Great Britain. Old Series, One-Inch Map with National Grid, England and Wales. | This geological map series of England and Wales was published beginning in 1834 and is shown on the Ordnance Survey Old Series of One Inch to the Mile base maps (see our 6916.000). A total of 262 sheets were published through 1898: 52 full sheets, 2 half sheets, and 208 quarter sheets. Our current set has 215 sheets; we have put online the missing 47 sheets with images from the collection of the British Geological Survey, although we will be replacing those over time as we acquire the missing sheets. The geological coloring of these maps was done by hand painting well into the 20th century - at a time when most geological maps were produced by color lithography. The resulting color is rich and produces images of great scientific and artistic clarity. Additional information on the history of the publication of the geological survey and map series is available at http://www.charlesclosesociety.org. Map catalog dates shown in our Date field are generally based on the most recent year shown on the map, with exceptions described in the Notes field. Our Pub Date (average date of the whole set of 262) is the date of the newest map in this set of the series. Geological maps show the 'solid' (bedrock) geology and the 'drift' deposits (such as peat and glacial deposits) with equal emphasis, if both are shown. See marginalia to determine if the map shows drift geology (surficial) geology, or updates for levels (elevations), railways, and other natural and cultural features. Additional individual map sheet and series information, such as history and legend, is available at the British Geological Survey at http://www.bgs.ac.uk/data/historicalmaps/home.html
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