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In the British Isles, 11 major Caledonian (pre-Variscan) terranes can be identified. The northern (Laurentian) miogeocline is composed of two terranes that were probably originally basement to the Cambro-Ordovician passive margin. These were deformed, uplifted, and amalgamated by across-strike shortening in the Grampian Orogeny (ca. 500 Ma) and later between 460 and 410 Ma. The southern miogeocline (Midland platform) is composed of Gondwanaland continental crust and shelf sediments, and appears to contain at least two terranes that were amalgamated prior to the Early Cambrian. Between these two miogeoclines lie a number of terranes that were finally docked in the site...

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