Glacial stratigraphy of Koillismaa and North Kainuu, Finland
Till stratigraphy and areal associations of landscape elements were studied in order to decipher the varying environmental characteristics within the ice sheet during each of the glacial phases recognized in the area. Drumlins and related glaciodynamic bedforms were found to date back to the cessat...
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Geographical Society of Finland
1979
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fttsvojs:oai:journal.fi:article/9164 2023-05-15T16:41:08+02:00 Glacial stratigraphy of Koillismaa and North Kainuu, Finland Aario, Risto Forsström, Lars 1979-02-01 https://fennia.journal.fi/article/view/9164 en eng Geographical Society of Finland https://fennia.journal.fi/article/view/9164 Copyright (c) 2014 Fennia Fennia; Vol 157 Nro 2 (1979); 1-49 Fennia - International Journal of Geography; Vol 157 No 2 (1979); 1-49 1798-5617 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 1979 fttsvojs 2020-09-30T22:46:13Z Till stratigraphy and areal associations of landscape elements were studied in order to decipher the varying environmental characteristics within the ice sheet during each of the glacial phases recognized in the area. Drumlins and related glaciodynamic bedforms were found to date back to the cessation phases of ice flow during deglaciation. The formation of large scale crescentic troughs was found to have commenced prior to that of the drumlins. Boundaries of major ice‑flow units are often well‑marked by interlobate and terminal complexes of various kinds and of various magnitude. More detailed ice‑flow patterns within the lobes were reconstructed on the basis of striae, directional landforms and till studies. The oldest tills found in the area predate the Peräpohjola Interstadial. Their respective landscape elements could not be traced. During the oldest deglacial flow phase the whole area was covered from the west by a single ice lobe, in the marginal zones of which a grey sandy till was deposited. Another facies, a dark grey, plastic till was deposited in the central parts of the ice lobe. The ice discharge pattern then changed and the flow split more or less simultaneously into three different lobes, which gave rise to three different tills respectively. This lobate arrange ment with three major flow units probably existed at the same time as the Second Salpausselkä phase. Article in Journal/Newspaper Ice Sheet Federation of Finnish Learned Societies: Scientific Journals Online Kainuu ENVELOPE(28.000,28.000,66.000,66.000) Koillismaa ENVELOPE(29.047,29.047,65.843,65.843) Peräpohjola ENVELOPE(25.967,25.967,66.667,66.667) |
institution |
Open Polar |
collection |
Federation of Finnish Learned Societies: Scientific Journals Online |
op_collection_id |
fttsvojs |
language |
English |
description |
Till stratigraphy and areal associations of landscape elements were studied in order to decipher the varying environmental characteristics within the ice sheet during each of the glacial phases recognized in the area. Drumlins and related glaciodynamic bedforms were found to date back to the cessation phases of ice flow during deglaciation. The formation of large scale crescentic troughs was found to have commenced prior to that of the drumlins. Boundaries of major ice‑flow units are often well‑marked by interlobate and terminal complexes of various kinds and of various magnitude. More detailed ice‑flow patterns within the lobes were reconstructed on the basis of striae, directional landforms and till studies. The oldest tills found in the area predate the Peräpohjola Interstadial. Their respective landscape elements could not be traced. During the oldest deglacial flow phase the whole area was covered from the west by a single ice lobe, in the marginal zones of which a grey sandy till was deposited. Another facies, a dark grey, plastic till was deposited in the central parts of the ice lobe. The ice discharge pattern then changed and the flow split more or less simultaneously into three different lobes, which gave rise to three different tills respectively. This lobate arrange ment with three major flow units probably existed at the same time as the Second Salpausselkä phase. |
format |
Article in Journal/Newspaper |
author |
Aario, Risto Forsström, Lars |
spellingShingle |
Aario, Risto Forsström, Lars Glacial stratigraphy of Koillismaa and North Kainuu, Finland |
author_facet |
Aario, Risto Forsström, Lars |
author_sort |
Aario, Risto |
title |
Glacial stratigraphy of Koillismaa and North Kainuu, Finland |
title_short |
Glacial stratigraphy of Koillismaa and North Kainuu, Finland |
title_full |
Glacial stratigraphy of Koillismaa and North Kainuu, Finland |
title_fullStr |
Glacial stratigraphy of Koillismaa and North Kainuu, Finland |
title_full_unstemmed |
Glacial stratigraphy of Koillismaa and North Kainuu, Finland |
title_sort |
glacial stratigraphy of koillismaa and north kainuu, finland |
publisher |
Geographical Society of Finland |
publishDate |
1979 |
url |
https://fennia.journal.fi/article/view/9164 |
long_lat |
ENVELOPE(28.000,28.000,66.000,66.000) ENVELOPE(29.047,29.047,65.843,65.843) ENVELOPE(25.967,25.967,66.667,66.667) |
geographic |
Kainuu Koillismaa Peräpohjola |
geographic_facet |
Kainuu Koillismaa Peräpohjola |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_source |
Fennia; Vol 157 Nro 2 (1979); 1-49 Fennia - International Journal of Geography; Vol 157 No 2 (1979); 1-49 1798-5617 |
op_relation |
https://fennia.journal.fi/article/view/9164 |
op_rights |
Copyright (c) 2014 Fennia |
_version_ |
1766031573483782144 |