Observations on the Quaternary geology of an area between the 2nd Salpausselkä and the ice-marginal formation of central Finland

Repo, R.; Tynni, R.

doi:10.17741/bgsf/43.2.005

Cited by 11 publications

(2 citation statements)

References 2 publications

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“…This point is very clear from all the maps showing both fluviogla-cia1 and active-ice-sculptured landforms (or striae and lodgement till fabric) for any area of moderate size in Finland (e.g. maps of Rosberg 1892Rosberg , 1899Brander 1934;Miilder 1948;Saksela 1949;Virkkala 1951, I-;Repo 1957Repo , 1960Repo & Tynni 1971;Gluckert 1971Gluckert , 1973Gluckert , 1974aGluckert . b, c, 1976Fogelberg & Seppda 1979) and Sweden (e.g.…”

Section: Radiul Patterns Of Landformsmentioning

confidence: 85%

Ice‐lobe formation and function during the deglaciation in Finland and adjacent Soviet Karelia

Kurimo

1982

Boreas

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The mode and nature of ice‐flow mechanism leading to ice‐lobe formation during deglaciation is described. These mechanisms are deduced primarily from their geomorphological and stratigraphical effects: the arc‐like formations fringing the ice lobes, certain patterns of landform elements, and in some cases the stratigraphical signs indicating ice‐marginal readvance or lack of it. Several ice‐lobe creation mechanisms are presented along with the associated landform patterns they produce. The theory encompassing the fan‐like ice flows, the ice‐lobe formation, and the arc formations fringing them is applied to the deglaciation in Soviet Karelia and adjacent Finland. Deglaciation proceeded here from the southeast to the northwest, and complex arc formations derived from the major ice lobes. The Finnish Lake District lobe, the North Karelian lobe, the Kuusamo lobe, and the other lobes in northeastern Finland were in general metachronously formed.

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Section: Radiul Patterns Of Landformsmentioning

confidence: 85%

Ice‐lobe formation and function during the deglaciation in Finland and adjacent Soviet Karelia

Kurimo

1982

Boreas

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“…The implication was a much earlier deglaciation of southern (and consequently also central) Finland. Also in the Jyvaskyla region an Occurrence of pollen zone 111 was suggested (Repo & Tynni 1971) obviously influenced by radiocarbon dating.…”

Section: Construction Of the Deglaciation Based Mainlymentioning

confidence: 99%

The deglaciation of Finland after 10,000 B. P.

Ignatius

Korpela

Kujansuu

1980

Boreas

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Various concepts of the deglaciation of Finland are presented in the form of a historical review. The suggestions of an early (12,000–10,000 B.P) deglaciation of eastern and northern Finland are considered to be erroneous. A map depicting the ice recession as successive ice‐marginal lines is presented. According to radiocarbon dates the Finnish territory was entirely deglaciated slightly after 9000 B. P.

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Associations of flutings, drumlins, hummocks and transverse ridges

Aario

1977

GeoJournal

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Associations of flutings, drumlins, hummocks and transverse ridges were created in the inner marginal zone of the ice sheet, where, nearer the ice margin, the ice was already thinner and the former higher flow velocity had slowed down due to the decreased volume of transported ice. However, as the ice flow mechanics tend to favour certain higher flow velocities, which can, to some extent, even be self-supporting, the speed of the ice did not slow down hornogenously throughout the ice mass. Certain parts of the ice continued to move at the higher speed but an increasing number of units appeared, where the velocity had dropped down to a considerably lower level. In the resulting flow pattern, wiith fast and slow units of ice flowing side by side, a drag effect contributed to a spiral secondary flow between the flow units of differential velocity.Both depositional and erosional processes were involved and, depending on the balance between them, the resulting bed configuration could be formed by either one or by a combined effect of both of these processes. However, faster flow regime more often favoured erosion and in areas of lower regime deposition more often prevailed. Consequently troughs were formed in the areas of higher velocity, while ridges and other positive landforms were created in the areas of lower velocity. The spiral flow frequently transferred drift from the trough area to the area of lower flow regime, and therefore the flute-ridges and drumlins were often formed depositionally by the combined effect of the slow parallel flow and the spiral flow component. Rogen ridges indicate an undulating flow. This could also exist simultaneously with the other kinds of flow and many landforms owe their characteristics to their combined effect. * Prof. Dr. Risto AARIO, Department of Geology, University of Oulu, Finland blages. They appear in the shape of individual Ilandforms and as an arrangement of flute-ridges, drumlins and hummocks aligned in straight rows.

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Observations on the Quaternary geology of an area between the 2nd Salpausselkä and the ice-marginal formation of central Finland

Cited by 11 publications

References 2 publications

Ice‐lobe formation and function during the deglaciation in Finland and adjacent Soviet Karelia

Ice‐lobe formation and function during the deglaciation in Finland and adjacent Soviet Karelia

The deglaciation of Finland after 10,000 B. P.

Associations of flutings, drumlins, hummocks and transverse ridges

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