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The Kangerdlugssuaq intrusion (68′ 20′ N. 32′30″ W., roughly circular and 33 km across) is of Tertiary age, like the nearby Skaergaard intrusion. At the present level of erosion the outer part is of nordmarkite and inwards there are successive rings of transitional pulaskite (without quartz or nepheline), main pulaskite and, in the centre, foyaite. The different rock types are due to gradual changes in the amounts of certain of the minerals and there are no sharp junctions such as would bedoi:10.1180/minmag.1965.034.268.43 fatcat:v4c4vy4p2vh27cyojda6vpg43u