Jökull - 01.11.1998, Blaðsíða 24

It was not possible to date the outermost moraine
in front of the Ögmundarjökull outlet glacier due to a
lack of lichens on the moraine. Only 10 samples of
the lichen Rhizocarpon geographicum were found on
the proximal side of the moraine. The results indicate
that the glacier began to retreat from its maximum
LIA glaciation in 1923±2 AD (Table I; Figure 6).
Temporal comparison of aerial photographs between
1946 to 1987 indicates that the glacier retreated 400m
from its maximum LIA advance and 1946. From
1946 to 1979 the glacier retreated another lOOm. The
glacier stayed at the same position in 1979 and in
Fig. 4. An aerial photograph showing the surface of the Klofajökull deposit in 1987. The easternmost lobe is probably an ac-
tive rock glacier at present. Evidence indicate deformation of ice within approximately 700 m from the visible ice-debris con-
tact on the surface, marked by the solid black line. The foot of the apron is at 600 m a.s.l.
- Loftljósmynd sem sýnir landslag Klofajökulsurðarinnar árið 1987. Austasta tunga urðarinnar er sennilega virkur grjótjökull
í dag. Ummerki á yfirborði urðarinnar sýna ís á hreyfingu innan við um 700 m geislafrá snertisvœði jökuls og urðar, merkt sem
heildregin svört lína. Rœtur urðarinnar eru í um 600 m y.s.
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JÖKULL, No. 46, 1998