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Two major divisions of Precambrian plutonic rocks are present in West Greenland south of 62°30′ N lat. The oldest (pre-Ketilidian) rocks, giving ages between 2,500 and 2,700 m.y., are in the north. They consist mainly of gneisses, but include amphibolite and mica-schist and contain a belt of locally migmatized supracrustal rocks (the Tartoq Group). The gneisses and the supracrustal rocks are cut by several generations of cratogenic basic dikes.

The pre-Ketilidian rocks are overlain unconformably by Ketilidian metasedimentary and metavolcanic rocks at approximately 61°15′ N lat. Southward the Ketilidian supracrustal rocks and the underlying gneisses and basic dikes are...

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