Jökull - 01.12.1982, Page 6

Fig. 1. Depth conditions around Grímsey. Depth
contoursvvith 100 m interval.
Mynd 1. Dýþtarkort við Grímsey. Dýþtarlínur eru á 100
m bili.
ings, where well preserved, were formed during the
last glaciation, and more specifically, during a rath-
er late stage of that glaciation. ITtis assumption is
based on several decades of personal investigations
in Scandinavia.
The presentation of facts begins with a short
summary of previously published results from
Grímsey (Hopþe 1968).
GRÍMSEY
Grímsey, a 5 km long island, up to 105 m in
elevation and 40 km north of the mainland, is situat-
ed on a submarine platform of less than 100 m
depth. To the west the sea bottom first slopes quite
gently but then comes Eyjafjardaráll, a continua-
tion of Eyjafjördur, with a depth of 400 to 500 m
some 35 km west of Grímsey. To the east Skjálf-
andadjúp comes much closer to Grímsey, and a
depth of 424 m is recorded only 15 km from the
island (Fig. 1).
As demonstrated in detail in my 1968 paper there
are numerous traces ofglaciation on Grímsey: roch-
Fig. 2. Glacial featuresofGrímsey.
Mynd 2. Jökulmenjar í Grímsey.
es moutonnées, glacial striae, till, and marginal
drainage channels. Furthermore, the island gives a
general impression of having been drumlinized
(Fig. 2).
Normally the striae give a rather simple picture of
ice flowing from south to north. There is an interest-
ing exception, however, to this main pattern of
movement. On the southernmost tip of the island
4 JÖKULL 32. ÁR