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FENNIA 66, N:o 1
11
westwards. At that time it was not certain, if the parallelism of the
late-glacial shore-lines occurs also south-east of Salpausselkä,
because the relations between the different water planes were not yet
adequately known.
Now, after five years, this lacune has been filled. A great number
of papers dealing with the changes of level has since been published
by L. Aario (1936), E. Aurola (1938), A. L. Backman" (1936, 1937),
Hellaakoski (1934), Sampo Kilpi (1937), K. K. Markow und Poretzky
(1935) Karl Orviku (1934), P. W. Thomson (1935), K. Virkkala,
and also some details and preliminary reports by the author
(Sau-ramo 1936, .1937, 1938 a).
Among these Hyyppä’s beautiful study concerning the
postglacial changes of shore-level in Southern Finland is of the greatest
importance as regards the aforesaid problem. He brought to its
solution the question concerning the complicated history of the Litt orin a
sea in the periphery of the area of land-upheaval. Hyyppä established
also the position of the highest limit of the Ancylus Lake in the
Helsinki area. The preceding well-marked shore-line, formerly assumed
to represent the initial stage of the Ancylus Lake, was found to be
of marine origin. It is to be correlated with the Rhabdonema stage
north-west of Salpausselkä, which consequently has now been traced
throughout the whole of south-eastern Finland. By Hyyppä this
shore-level is designated Lg VIII and Lg. IX, i.e., the eighth and
ninth late-glacial beach.
In conformity with these new results we can expect to find the
counterparts also of the earlier late-glacial shore-lines of Western
Finland south-west of the Salpausselkä moraines. As mentioned above,
some of them have been determined by means of the glacifluvial deltas
connected with the Salpausselkä moraines. Now, in the summers of
1937 and 1938, the author traced the wave-cut benches of the Yoldia
and Rhabdonema Seas from the Salpausselkä zone southwards along
the northern coast of Lake Ladoga, in the north-west of Viipuri, and
on Suursaari (Högland) Island, where all old shore-lines of the Baltic
basin are visible in one place. Here, and in the whole zone
investigated, the initial stage of the Littorina Sea lies at 22’—23 metres, and
the first Yoldia shore-line (YI, by Hyyppä designated Lg V) at 60—63
metres, as seen in the map Fig. 5.
Thus, the first Yoldia and consequently also the other
Late-Quaternary beaches here above the Yoldia have an elevation of 20 metres
more than was assumed by the author earlier; otherwise their places
in Western and Central Finland have remained unchanged. Therefore
they are not rectilinear, like the post-glacial shore-lines, but, as seen
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