Rit (Vísindafélag Íslendinga) - 01.07.1962, Side 70

Rit (Vísindafélag Íslendinga) - 01.07.1962, Side 70
70 Considering the double glaciation of the slopes of Hvalfell on one hand, and the normal polarization on the other it is most likely that Hvalfell was formed in the Mindel-Riss inter- glacial, not later. On this basis the steep-sided river channel in the old valley would have formed before Mindel. This is in harmony with the results in Eyjafjörður (Einarsson 1959b) that the corresponding channel must be of rather early Pleisto- cene age. Súlur, Gagnheiði, Ármannsfell. The uppermost magnetic group of the Plateau Basalts at the head of Hvalf jörður is of normal polarity and was term- ed N2 in the publications of Einarsson and Sigurgeirsson (1956, 1957). On this group rest reverse lavas on Kjölur and at the hase of Kvígindisfell, termed R,. N2 is the last but one normal group in a local sense. But as the group belongs to the dipping plateau and is older than planation and valley erosion in the plateau there is no doubt that in a universal sense it is a much earlier magnetic group. It is one of the aims of the present study to fill up the gap between this youngest plateau group and the upper Pleistocene normal group. The Súlur massif is a heap of tuff-breccias of normal pola- rization which rests directly on the plateau group N2. The contact is at 550 m in the west, falling to 450 m in the east. On the west and north sides this contact runs along the steep mountain slope and it seems difficult to escape the conclusion that the Súlur rocks are older than this slope, i.e. older than the topography at the head of Hvalfjörður. But in this topography are represented the same erosional stages as we have recognized in the Plateau Basalt area of Middle Northern Iceland. The Súlur seem thus to be older than at least valley erosion, and hence much older than Hval- fell. This is also borne out by the advanced dissection of Súlur, This massif is cut by deep and broad valleys and an
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Rit (Vísindafélag Íslendinga)

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