Jökull - 01.12.1978, Page 11

Fig. 9. Map showing
fluvioglacial and fluvial
sediments as well as
ablation moraines. Ex-
planations: 1. Vindheima-
melar, raised delta, 2.
Fluvioglacial sediments
with kame and kettle
topography, 3. Fluvio-
glacial sediments cov-
ered with bog, 4. Abla-
tion moraine, 5. Kettles,
6. Eskers, 7. Recent flu-
vial sediments, 8. Dry
meltwater channels, 9.
Terraces. 10. Bedrock,
11. Direction of glacial
striae (towards ober-
vation point), 12. Ice
wedge casts.
Mynd 9. Kort sem sýnir
jökulárset, árset og leys-
ingarruðning í nágrenni
Vindheimamela og í dal-
verpinu þar fyrir sunnan.
Skýringar: 1. Vindheima-
melar — forn óseyri, 2. jök-
ulárset víðast með ummerkj-
um eftir dauðís, 3. jökulárset
hulið mýri, 4. leysingar-
ruðningur, 5. jökulker, 6.
malarásar, 7. ungt árset, 8.
þurrir farvegir, 9. malar-
hjallar, 10. berggrunnur,
11. stefna jökulráka (að
athugunarstað), 12. malar-
náma meðfornum ísfleygum.
run in a northeasterly direction along the top of
the delta. To the west of the remaining delta
deposit the present river, Svartá, has eroded a
600 m wide channel. Outcrops in the distal
slope of the delta show foreset layers dipping
20—30° towards north. These layers are
overlain by crossbedded topset layers mostly
consisting of sand. The sandgrains are
frequently veneered by fines. The topset layers
are in some places overlain by clean sand and
gravel washed by sea abrasion.
To the southwest of the Vindheimamelar
delta deposits of ice contact fluvioglacial
sediments and ablation till represent the ice
front at the time of formation of the delta. No
end moraine ridges have been observed, but
the marginal origin of these sediments is
certain, as the ice contact fluvioglacial
JÖKULL 28. ÁR 9