Abstract
Sediments associated with Tertiary basalts were suspected to occur at Kap Brewster, Scoresby Sund, since W. Scoresby's expedition brought back pieces of charcoal, and O. Nordenskjold and P. Koch found there numerous fossil tree trunks lying loose in basalt scree (Mathiesen, 1932). The sediments, with a marine fauna partly comparable with those known already from Kap Dalton (Ravn, 1933), were located at Kap Brewster by D. Mackeney and F.W. Sherrell, members of Lauge Koch's expedition in 1951. Hassan (1953) described the fossils colIected by them and gave a fairly detailed description of the geology of the area based on their field report. In ascending order he distinguished: (A) the infra-basalt sediments (age unknown), (B) the plateau basalts (Tertiary, with sediment intercalations), (C) the Kap Dalton 'series' (subdivided into the 'Cyrena beds' - Middle-Upper Eocene, and the 'Coeloma beds' - probably Lower Oligoeene), and (D) the Kap Brewster 'series' ('Chiamys beds' - probably Miocene). The relationships between these units were not determined. This was, therefore, the aim of the present author's visit in 1971 within the mapping programme of the Geological Survey of Greenland. B. Buchardt Larsen assisted the author in the fieid, and his help is acknowledged here with pleasure.
Highlights
The area of Tertiary basalts and sediments adjoining Kap Brewster, i. e
To the north-west of the Muslingehjørnet fauIt, the upthrown Søstrene block consists of anearly horizontal pile of basalt lava flows with a few thin sedimentary intercalations, altogether more than 1100 m thick, The basalts are underlain by shales of probably Mesozoic age
To the south-east of the Muslingehjørnet fault, the downthrown Kastellet block consists of a pile of basalt lava flows with subordinate thin sediment and tuff intercalations, altogether more than 500 m thick
Summary
To the south-east of the Muslingehjørnet fault, the downthrown Kastellet block consists of a pile of basalt lava flows with subordinate thin sediment and tuff intercalations, altogether more than 500 m thick. The area, and are represented by the Kap Dalton and Kap Brewster fonnations These sediments, which are the youngest Tertiary fonnations of East Greenland, occur at Savoia Halvø in a shallow graben delimited in the west by the' Muslingehjørnet fault, and in the north and south by the Kfkiakajik and Bopladsdalen faults respectively; both these last named faults trend southeastwards. The basalt lava flows exposed north-east of the Bopladsdalen fault (at Kastellet and Kap Brewster) dip 5°-20° (on average 10°) towards the south-west, 10cally towards the west. The sediments of the Kap Brewster Fonnation occupy a special position within the downthrown block, which will be discussed later
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