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8
Matti Sauramo, The mode of the land upheaval in Fennoscandia.
ice-margin was withdrawing to the north-west, and during these
times other beaches were formed, such as the glaci-lacustrine BVI,
B VII, B VIII, the marine Yoldia I, Yoldia II, Yoldia III, Yoldia IV
( = Rhoicosphoenia, Sauramo 1934), and, at the end of the Ice Age
the Rhabdonema, the best developed shore-line of the Baltic (Fig. 3.).
Altogether fifteen late-glacial raised beaches are known in Finland;
their number thus being the same as that of the post-glacial
shorelines (see Fig. 4.). Their chronology is based upon the author’s studies
concerning the varved sediments of Finland. In this time-scale the
last year of the Second Salpausselkä stage has been taken as zero
(Sauramo 1918, 1923).
Fig. 5. Map showing Southern Finland at the end of the first Yoldia Sea stage.
White = sea; striated area = dry land; black = Salpausselkä end-moraines
and Selkäkangas in NW of Joensuu. Ice margin indicated by a toothed line.
The isobases show the Yoldia water plane in its present deformed state. On the
dry land in Eastern Finland the isobases are drawn in accordance with the
shore-line of the first Baltic Ice-lake. J — Joensuu, L = Lahti, V = Viipuri.
Fig. 5 is a palaeogeographic map showing the conditions in
Southern Finland in the year 370 after the Second Salpausselkä, or about
7 780 B. C. It shows the distribution of sea, land, and ice-sheet and
also the plane of the shore-line of the First Yoldia sea (YI) in its
recent deformed position. By the differential uplift of the earth-crust
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