Jökull


Jökull - 01.12.1985, Side 19

Jökull - 01.12.1985, Side 19
The outermost zone A is the least well defined. At most it is about 2 km wide, running from Straumnes southeastwards to a position 4 km northwest of Ritur. It has a semicircular appearance, with its concave side towards Adalvík. The water depths on the banks are 33—40 m, whereas immediately inside the depths are between 42 and 44 m and outside between 42 and 47 m. Some 2—3 km inside zone A there is another zone with shallow banks, zone B. It is narrower than zone A, only 0.5-1.0 km wide, and runs from Látrafjall south- westwards to Ritur. It is also semicircular with the concave side towards Adalvík. The water depths on these banks are between 16 and 22 m. Inside depths are between 25 and 31 m and immediately outside between 24 and 36 m. What these banks are made of is not known, but their semicircular appearance, with the concave side towards land, seems to suggest a glacial origin. It should also be noted that zone A is „anchored“ with its northern flank at Straumnes, whereas zone B is „anchored“ in a similar way with its southern flank on Ritur. Accordingly both zones lie in positions where the lateral confinement of a glacier advancing seawards from Adalvík would dimin- ish drastically. Any further advance beyond each of these positions would need a greatly increased supply of Fig. 8. Logs of the coastal cliff section 1 in Haelavík and a section from within the Stadarvatn terminal moraine zone. 8. mynd. Jarðlagasnið 1 frá Hœlavík og jarðlaga- snið frá jökulgarðinum við Staðarvatn. Fig. 9. Section 1 in Haelavík. The boundaries between the lower till, the marine silt (3 m) and the upper till are shown by arrows. Note the concentration of boulders within the silty matrix in the upper part of the lower till, interpreted as a waterlain part of the till. 9. mynd. Jarðlagaskipan í sniði 1 í Hælavík. Jarðlagamót merkt með örvujn. Takið eftir fjölda hnullunga í efsta hluta neðra jökulruðningsins. ice compared with what was needed for the advance up to these positions. Also, at the zone A position, the glacier in Adalvík may have coalesced with the glacier coming out of ísafjardardjúp. This can be inferred from the way in which the banks constituting zone A end towards the south - without any obvious „anchoring" point. Zone A lies 2-5 km inside the outermost position of the ice front, as it was calculated using plateau surfaces unaffected by glacial erosion as upper limits for ice thickness (Fig. 5). However, as that position is very tentative and based on the very maximum concept, it is JÖKULL 35. ÁR 17
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Jökull

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