Abstract
Late Proterozoic(?) to Silurian clastic and carbonate sequences overlying crystalline basement in southern Wulff Land are described. Strata older than early Middle Ordovician compare best with the sequence to the east, in Peary Land, while late Middle Ordovician to Upper Silurian sediments show greater similarity to outcrops in western North Greenland.
Highlights
Late Proterozoic(?) to Silurian clastic and carbonate sequences overlying crystalline basement in southern Wulff Land are described
No systematic description of the geology of southern Wulff Land has been published scattered observations have been made by Koch (1920)
Wulff Land occupies a key position in North Greenland geology with its relatively complete Lower Pa!aeozoic sequence providing a link between comparatively well known sections in Inglefield Land, Washington Land and Hall Land, to the west (Troelsen, 1950; Dawes 1976a; Henriksen & Peel, 1976) and equivalent, but somewhat dissimilar, sections in Peary Land, to the east (Jepsen, 1971; Christie & Peel, 1977)
Summary
Together provisionally and referred to as a single unit (Brønlund Fjord Group - Wandel Valley Formation) arter Iithostratigraphical names employed in Peary Land, but probably include strata of Early, Middle and Late Cambrian, and Early and Middle Ordovician ages. The shelf carbonates pass abruptly northward into a thick clastic sequence of shales, silts and turbidites, which appears to range in age from at least Late L1andovery (Telychian) to Ludlow. At this contact, but topographically below the platform sediments, a third carbonate buildup horizon occurs. The highest exposed beds cansist af 5 - IO m ol" do\omilic breccia in which roor1y sorted, angular to subrounded cJasts (coarse grains to J In boulders) af quartz, granitic bascment, various dolomites (including oolites) and sand stones are supported by a bufT coJoured matrix of dolomitie sand Blocks of similar sandstone have been observed in the calcareous breccia overlying the metamorphic basement at locality 4. On the basis of available evidence, a tentative correlation of the un-named dolomite formation with the upper part ofthe Portfjeld Formation of Peary Land is considered the most appropriate
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