Recent stratigraphical, morphological, and radiocarbon data indicate that most of eastern Finland north of North Karelia was deglaciated in early Flandrian times between about 9500 and 9000 B.P. The Younger Dryas ice margin, represented by the Salpausselka ridges in southern Finland, continued through the North Karelian end‐moraines across the eastern border of the country. In Soviet Karelia it is possibly represented by the so‐called East Karelian end‐moraines known from earlier studies.
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Hannu Hyvärinen (1973) studied this question.