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Map series Index to colours used on geological maps 
Sheet title Index to the colours and signs employed in the maps and sections of the Geological Survey of Great Britain for Wales, the Midlands and southern & western counties of England. Jan 1856. [First of the Murchison series, incorporating a newly revised colour scheme together with the introduction of an alphabetic letter for each geological System] [BGS Archive Reference GSM/DC/S/3.] 
Publication year 1856 
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This map is made available under the Open Government Licence, subject to the following acknowledgement accompanying any reproduced BGS materials: "Contains British Geological Survey materials © NERC [year]".

Hutton field: well correlation diagram.
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