Several north-trending structures in the Canadian Arctic islands are interpreted as Caledonian in origin, in the sense that they probably represent intraplate tectonism triggered by the closing of the Iapetus Ocean along the Greenland-Scandinavia-Svalbard Caledonian suture. These structures include the Boothia uplift, Rens Fiord uplift, Inglefield uplift (redefined unit, replacing Bache Peninsula arch), and possibly several other structures, such as the Cornwall arch, which are now expressed mainly in Mesozoic-Cenozoic strata but may represent rejuvenated Caledonian lineaments.

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