Jökull - 01.12.1978, Blaðsíða 47

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Fig. 3. Nature of sea-bed as determined from sonographs. Shading as follows: 1) Rock
(unit 1), 2) Gravel (units 2 and 4), 3) Rippled gravel (of unit 2), 4) Sand (unit 3), 5)
Landscape, or structural trends in rock floor, 6) Indistinct, or gradational, sand/gravel
boundary.
Mynd 3. Kort afbotngerð svœðisins, byggt á botnsjármœlingum. 1) Harður botn, 2) möl, 3) gáruð möl,
4) sandur, 5) línuleg landslagseinkenni í hörðum botni, 6) ógreinileg mörk sands og malar (punktaröð).
gravels there occurs a strip of fine sediment,
appearing as a very light tone on the sono-
graphs. This type of floor is mapped as “sand”
on Fig. 3. The sonographs indicate that this
bottom-type is generally flat and featureless.
In the south the sand/gravel boundary is gra-
dational and its position on the map is
somewhat arbitrary. Farther to the east it be-
comes sharp and takes up an intricate, often
crescentic form, with the convex side of the
JÖKULL 28. ÁR 45