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From about 60 to 50 million years ago there were important igneous extrusions and intrusions in northwestern Britain. In Northern Ireland and northwestern Scotland, basaltic lava flows (e.g., in the Giant’s Causeway and the northern part of the isle of Skye) are associated with northwest–southeast-trending basaltic dikes and many plutonic (igneous rock formed deep within the crust) complexes, which are probably the roots of volcanoes. The dikes extend southeastward across northern England and continue under the North Sea. Related lavas occur in the Faroe Islands. Those igneous rocks formed in the faulted and thinned continental margin of northwestern Europe contemporaneously ...(100 of 20355 words)