Fróðskaparrit - 01.01.1975, Side 94

102
Glacial Erratics
Fig. 1. The Pecten dredge on board »]. C. Svabo«.
1. mynd. Skeljadreggið umborð á »]. C. Svabo«.
Survey of Denmark (Rasmussen 1973, 1974). According to this
programme the glaciation of the outer shelf is to be studied
by dredging erratics from the sea floor along lines radiating
away from the islands in all directíons, and a special attempt
should be made to define the limit of glaciation from the ratio
between local and foreign erratics.
The research vessel »J. C. Svabo« (138 gross register tons)
was placed at our disposal by the Fishery Research Institute
in Tórshavn. »J. C. Svabo«, which is owned by the Faeroese
Government, is equipped with Decca navigation system, radar
and echo sounder (Simrad scientific sounder EK 12 A).
All dredge hauls except no. 87 were made by a Pecten
dredge (fig. 1) with a front opening of 12 X 120 centimeters
and an effective mesh width of 5 centimeters used by the
Fishery Research Institute for dredging scallops. The length
of the dredge hauls was generally 1 — 3 kilometers. On slopes
the haul was done approximately parallel to the isobaths.