Map record details

Map series Index to colours used on geological maps 
Sheet title Colours & signs employed in the Ordnance Geological maps of Cornwall, Devon and west Somerset. 2nd index 1839. Copy made 22.6.07, by H.E.G. Initialed 'H.W.G.W.' (original with maps 20–27, 2nd ed.) [BGS Archive Reference GSM/DC/S/3.] 
Publication year 1839 
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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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