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  • ...crust collide; a modern example is the western part of the Pacific Ocean. Volcanic material was erupted onto the sea bed or on land, perhaps forming extrusive [[Image:P601562.jpg|thumb|left|200px|Andesitic volcanic breccia in the Charnian Supergroup. [http://geoscenic.bgs.ac.uk/asset-bank/
    8 KB (1,180 words) - 17:00, 28 July 2015
  • ...e, and these accumulated marine Devonian and Carboniferous sedimentary and volcanic rocks. Progressive convergence, beginning in mid-Devonian times, inverted t ...Upper Carboniferous sequence, the Precambrian Johnston Complex and Benton Volcanic Group have been thrust northwards on the Johnston Thrust for some 4  k
    12 KB (1,783 words) - 10:53, 5 May 2016