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FENNIA 66, N:o 1
23
time they show a tendency to be in harmony with some local structure
of the earth’s crust.
The discontinuous uplift appears in the diagram, Plate I, the
shore-lines being divided into three groups according to their degree
of tilting. The first and most tilted group consists of BI only. The
second group is formed by the succeeding and, in the central area,
parallel late-glacial shore-lines (Bill—Rha I), whereas all post-glacial
water planes counted from All belong to the third group. The groups
are separated from each other by some intermediate shore-lines of
short duration, as for instance BII between the first and second group,
and, Rhabdonema II, Rhabdonema III and also the first Ancylus
between the second and third group. The whole system shows clearly
that the degree of tilting of a shore-line is no measure of its age.
Instead the intermissions of the relative land uplift have followed a
regular time-table, the longer pauses during the late-glacial time, G,
YI, YIV, and Rha, having a periodicity of about four or three
centuries.
In the third group there is seen an unusually wide angle between
the second and third Littorina shore-line. In this case Liden’s (1938)
admirable curve showing the rate of the regression in
Ångermanland is not suggestive, because its form between the stages LII (4 500
B. C.) and LIII (3 300 B. C.) happens to be based upon interpolation.
Future researches will show whether the regression during this time
was gradually diminishing or implies retardations and accelerations
corresponding chronologically to that part of the post-glacial epoch,
when the peripheral zone of the isostatically uplifted area was
temporarily resubmerged by the eustatic rise of the sea-level.
BIBLIOGRAPHY.
Aario, Leo (1932), Pflanzentopographische und paläogeographische
Mooruntersuchungen in N-Satakunta, Fennia 55, N:o 1.
—»— (1936), Entwicklung des südlichen Vor-Päijännesees, Fennia 62.
Ahlmann, H. W:son (1938), Über das Entstehen von Toteis. Geol. Fören.
i Stockholm Förhandl. Bd. 60.
Auer, Väinö (1924), Eräitä vastaisia tehtäviä suotutkimuksen alalla Suomessa,
Über einige künftige Aufgaben der Moorforschungen in Finnland.
Com-municationes ex instituto Questionum Forestalium Finlandiae editae 8.
Aurola, Erkki (1938), Die postglaziale Entwicklung des Südwestlichen
Finnlands, Bull. Comm. géol. Finl. N:o 121.
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