Jökull - 01.12.1964, Síða 10

Fig. 2. The 1890-moraine short W of Kringilsá.
The scar to the left goes down to the ice core,
showing that the ice-free moraine cover is only
about 1.5 m thick in this place.
Photo: S. Thorarinsson, Sept. 5, 1962.
of Jökulkvísl, which existed before the 1890-
advance, and in all probability they date back
to the 1810-advance, which thus has brought
the ice margin a little farther than the 1890-
advance in that area.
Todtmann describes a large terminal mo-
raine in Kringilsárrani about 1.5 km south of
the “hraukar”, ancl regards this moraine to be
the 1810-moraine, which had been overridden
by the ice during the 1890-advance. (Todtmann
1955, p. 261). This may be true, although it
does not quite agree with Kjerulf’s report of
the 1890-advance. Todtmann mentions that the
Askja tephra of 1875 is founcl in the foldings
of the uppermost layers of these moraines. Ac-
cording to my investigations in 1962 the south-
ern limit of the 1875-tephra sector is definitely
north of the “hraukar” (cf. the isopach map,
fig. iv in Thorarinsson 1963). However, wind
drifted 1875-tephra may be found south of the
“hraukar”, because, at 13 cm depth and some
cm upwards the soil in section Cf 16a (fig. 6)
is lighter in colour than the underlying soil,
and there is no doubt that the light colour
is caused by wind drifted dust from the 1875
tephra layer. I am, however, a little doubt-
ful as to the possibility of recognizing it as far
south as the “1810” moraine. I would think it
more likely that the tephra mentioned by
Todtmann as the 1875 one is the Öræfajökull
tephra of 1362.
SOIL SECTIONS JUST NORTH
OF HRAUKAR
Sept. 4th, 1962, I measured a soil section
about 10 m north of Hraukar on the E part
Fig. 3. Position of section Cf 16a (indicated
by an arrow to the farthest left) north of Hrauk-
ar on Kringilsárrani. View towards E.
Photo: S. Thorarinsson, Sept. 4, 1962.
Fig. 4. The same area as on fig. 3 (cf. the
arrow) but viewed towards W. Relative height
of the “hraukar” to the left is 18 m. During
the first summers after the 1890-advance melt-
water from the ice margin has eroded a lateral
bed through the loessial soil cover down to the
ground moraine.
Photo: S. Thorarinsson, Sept. 4, 1962.
JÖKULL 1964
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