Abstract
Abstract The paper is a reply to one of S. Gavelin (Geol. For. Forh. 80, 1958) in which he discusses Archean stratigraphy in Vasterbotten and Norrbotten. Since publication both Gavelin and myself have carried out additional investigations. New material is here presented in support of my previously published view (SGU Ser. C, 543, 1957) that the Revsund granite is younger than the Vargfors conglomerate. In addition, the conglomerates with granite pebbles at Duobblon and Ledfat are discussed on which A. Hogbom (1937) and S. Gavelin (1955, 1958) based their earlier view that the Revsund granite was older than the Vargfors conglomerate. S. Gavelin's microscopic examination of granite pebbles from Ledfat has shown that the petrography of these does not show any similarity with the Revsund granite. The coarse-grained granite of the conglomerate pebbles contains plagioclase but no microcline, while the coarse-grained Revsunds type is clearly a microcline granite. S. Gavelin describes his results on p. 742 in the...
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