Jökull - 01.12.1985, Page 18

m higher than today. This represents the marine limit
here. The beach sediments were deposited on top of the
till and later also onto the face of the cliff.
The valley inside Hlöduvík is about 4 km long and 2
km wide. Its lower parts are characterized by hum-
mocky deposits similar to those inside Haelavík (Fig. 7).
Six well developed cirques face this valley, compared to
only one well developed cirque inside Haelavík (Fann-
arlág). On the eastern side there are two cirques (see
Fig. 7) with their floors around 150 m and 200 m above
sea level, respectively. They are fronted by small mor-
aines. The moraines are weathered and surrounded by a
mature vegetation cover, indicating that these cirques
have not been glaciated for a long time. The higher
situated cirques at the head of the valley (with floors at
300-350 m) have much less vegetation. The moraines
and other surfaces within them look much fresher, and
they contained glaciers during the Little Ice Age (Fig.
13).
Fig. 7. Air-photo of Haelavík. Sec-
tions 1, 2 and 3 are indicated along
the coast. The Littla Ice Age morains
(numbered 0—9) are seen in the Fan-
narlág cirque at the head of the val-
ley. The uppermost lateral deposits
laid down by a Weichselian outlet
glacier, around the present 150 m
level, are indicated by black arrow-
heads, the lower lateral terrace
around 55 m by small arrows. Note
also the late glacial hummocky terrain
in the lower part of the valley, the
very premature cirques around the
200 m level on Haelavíkurbjarg east
of the valley and the much better
developed cirques in the lower part of
the photograph — facing southwest
towards Hlöduvík and with the floor
of the lowest/westernmost one
between 100 and 150 m. Photo pub-
lished with permission of the Geode-
tic Survey of Iceland. 7. mynd. Loft-
mynd af Hœlavík. Lega sniða 1, 2, og
3 sýnd með ströndinni. Jökulgarður
frá Litlu Isöldinni eru merktir eins og
á 14. mynd. Jaðarmyndanir jökuls
síðasta jökulskeiðs í um 150 m yfir sjó
eru merktar með svörtum oddum, og
jaðarhjallar frá síðjökultíma í um 55 m
yfir sjó með litlum svörtum örvum.
Takið einnig eftir jökulruðningi frá
síðjökultíma í neðri hluta Hælavíkur
og hinum ýmsu stigum hvilfta í lands-
laginu.
Evidence from Hlöduvík shows that the outlet glacier
there, fed by six cirque glaciers, advanced beyond the
present coastline and deposited the till. When it with-
drew the sea stood about 10-15 m higher than today.
This means that the Hlöduvík glacier must have retain-
ed its advanced position somewhat longer than the
Haelavík glacier 2 km to the east, which retreated inside
the present coastline when sea level stood about 26—27
m higher than today. This discrepancy could be due to
the much larger accumulation area feeding the Hlödu-
vík glacier, making it react slower to climatic improve-
ment than the Haelavík glacier.
Submarine Adalvík: According to the Icelandic Hy-
drographic Survey (1977), two concentric zones of shall-
ow banks exist at the entrance to Adalvík (Fig. 6).
16 JÖKULL 35. ÁR