Jökull - 01.12.1966, Page 5

than the central ones, in other words, that
there was a kind of wave advancing towards
the centre, following the shrinking ice margin.
Such a process is likely for a very large area;
we shall inquire whether it took place in the
Scandinavian region.
Fig. 3 shows ancient shorelines and the pre-
sent velocity of rise in Scandinavia,based on
Sveriges geologi (p. 525, 528, 529, and 537).
All sections are taken along the line Gedynia—
Moskenesöy (southern Lofoten) which goes
through the centre of uplift for the Littorina
level. Line 1 is the level of the Yoldia sea
(about 9500 B.P.), line 2 is the Ancylus lake
(about 8500 B.P.), line 3 is the Littorina sea
(about 7000 B.P.), and line 4 shows the velocity
of present uplift, the scale being chosen so as
to facilitate comparison with the Littorina level.
At the time of the Yoldia level here used,
absolute sea-level was about 20 m below the
present stage, according to curve Si in Fig. 2,
and for the following comparison we lift the
Yoldia level by 20 m to get line l'. At the
time of the Ancylus level the sea was 10—20 m
Fig. 2. Decrease of the
Scandinavian ice shield at
the end of the Ice Age;
Ga: by area; Gv.: by
volume. Bi, Bg and B4 are
different alternatives of
isostatic depression of the
general ocean floor. Si
rise of sea-level relative
to unglaciated areas after
Fairbridge; S2 same after
Godwin et al. Vi, V3, A
are calculated curves for
the rise of sea-level. Time
scale at the bottom of
figure.
2. mynd. Dvínun jökla í
Skandinavíu í lok isaldar:
°S G,r Hugsanlegt sig
sjávarbotns: Blt og 2I4.
Mœlt ris sjávar utan
jöklasvæda: Si og So, og
reiknað: Vi, V<i o<r A.
Neðst: Timi i þúsundum
ára fyrir nútimann.
JÖKULL 159