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The source of the granite in the Cheviot pluton need properly referencing if it is to be included. The article currently asserts an origin in the 'mantle crust' which is not a recognisable geological term. Was it the crust or was it the mantle, or perhaps both; lithosphere was descending here as Iapetus closed. Secondly a date of +298Ma is given for Carboniferous erosion. Not sure what the '+' means but 298Ma is in the earliest Permian rather than the Carboniferous. thanks Geopersona (talk) 10:31, 16 January 2022 (UTC)[reply]
Per recent edit and revert, is the Cheviot an 'intrusive granite mass' or 'extinct volcano'? Well, both really - it comes down to definitions and nuance. The rock that makes up the uppermost part of the massif (and so includes Cheviot summit area) is granite (igneous, yes but not a volcanic rock) which was intruded into the pre-existing volcano. In this connection it concerns me that many British hills which are composed, at least in some part, of volcanic materials are labelled as extinct volcanoes which may lead the unwary to imagine that the present day landform bears some similarity to the original volcano when in fact in almost all cases, they are wholly dissimilar and the one-time eruptive centre of the volcano may lie at some distance from today's hill or mountain.Geopersona (talk) 19:26, 20 October 2022 (UTC)[reply]
