University of Oulu

Lunkka, J. P. (2023). The morphostratigraphic imprint of the Baltic Ice Lake drainage event in southern Finland. Bulletin of the Geological Society of Finland, 95(1), 47–58.

The morphostratigraphic imprint of the Baltic Ice Lake drainage event in southern Finland

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Author: Juha Pekka Lunkka, Juha Pekka1
Organizations: 1Geology Research Group, Oulu Mining School, University of Oulu, P.O. Box 3000, FI-90014 University of Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.2 MB)
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Language: English
Published: The Geological Society of Finland, 2023
Publish Date: 2023-10-10


Digital elevation models, based on laser scanning imageries (LiDAR-DEM) and aided by ground penetrating radar (GPR) data, were used to study glaciofluvial Gilbert-type ice-contact deltas in the Younger Dryas Salpausselkä end-moraine zone in southern Finland. The geomorphological data analysed were used to reconstruct the water-level drop of the late glacial Baltic Ice Lake to the early Holocene Yoldia Sea and tie these changes to a wider stratigraphic context. The results indicate that the sudden drainage event at around 11 650 cal. yrs BP left its imprint not only on the varved sediments but also on ice-contact glaciofluvial deltas in the Second Salpausselkä zone throughout southern Finland. This morphostratigraphic boundary can be placed at locations where the ice-contact deltas occur at two different levels; the higher-level deltas formed during the Baltic Ice Lake B III water-level stage and the lower-level deltas during the Yoldia Sea Y I water-level stage. This morphostratigraphically defined boundary in southern Finland marks the Pleistocene/Holocene chronostratigraphic boundary in southern Finland and shows the corresponding positions of the Scandinavian Ice Sheet’s Finnish Lake District Ice Lobe and the Baltic Sea Ice Lobe.

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Series: Bulletin of the Geological Society of Finland
ISSN: 0367-5211
ISSN-E: 1799-4632
ISSN-L: 0367-5211
Volume: 95
Issue: 1
Pages: 47 - 58
DOI: 10.17741/bgsf/95.1.004
Type of Publication: A1 Journal article – refereed
Field of Science: 218 Environmental engineering
Copyright information: © 2023 Geological Society of Finland. All published content of BGSF is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.