Fróðskaparrit - 01.01.1977, Page 183
Glacial striae, roches moutonnees and ice movements
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78). Helland (1880) describes the ice movement further east
at the mouth of Vagsfjørður as having been towards the east.
Víkarbyrgi.
In the valley above Víkarbyrgi, Siglidalur, roches mouton-
nees have been observed showing ice movement to the NNE
and NE (sites 83 and 84) and weak striae oriented NNE-SSW
(site 83). North of the stream, weathering is very noticeable,
and only one site has been found with obvious roches mouton-
nees, which showed ice movement to the ENE (site 85).
Blaing — Sumba.
On the most southerly part of Suðuroy the ice movement
must be assumed to have been easterly on the east coast at
Blæing, but southeasterly at Akraberg on the southern tip of
the island. Since no striae or roches moutonnees have been
observed here this conclusion can be based only on the nature
of the terrain and the landscape morphology. The iceshed
probably lay in the vicinity of the ridge Eggjargarður, which
connects Knúkur with Skálin. This ridge has been formed by
late Glacial landslides (Jørgensen 1972) and is a continuation
to the SE of the previously mentioned NW—SE oriented fault
system.
Conclusion.
Investigations of the striae, roches moutonnees, and ice shed
positions on Suðuroy indicate that this island has had its own
ice cap, at least during the last glaciation, and that the
principal iceshed lay near the present west coast.
The observations made indicate that the principal iceshed
followed the island’s long axis in an undulating NW—SE
course. It has been shown that in all the E—W oriented valleys
the iceshed lay a little to the east of the present watershed.
Where the principal iceshed has been observed directly and
localized by roches moutonnees, it is shown on the map as a
heavy red line with arrows in two opposing directions. Between