DEGLACIATION IN EASTERN AND CENTRAL ... - arkisto.gsf.fi

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Efforts to unravel unravel the his history tory of of the Salpausselkäs constitute an important chapter
in the the his history tory of ofresearch research into Quaternary geology geology in Finland. Finland. Therefore, Therefore, the course
taken taken by by Quaternary geological research, research, studies of the Salpausselkäs Salpausselkeis and the use
of of the the Salpausselkä concept are treated treated at some length length in in what what follows. follows.
Concepts an and d nomenclature
Salpausselkä I, as as an entity entity of of that that name, is here here considered to to terminate at a
marginal plain at the the village village of Patsola, Patsola, Värtsilä. Värtsilä. Salpausselkä Salpausselkä 11 II terminates
immediately south south of the village village of Kiihtelysvaara. Kiihtelysvaara. Its Its northernmost northernmost plains plains on the
basic maps (4241 04 Viesimo Viesimo and 4241 424L 05 Kiihtelysvaara) Kühtelysvaara) are Puustellinkangas,
Metsälänsalo and Kirkkokangas. South ofKiihtelysvaara, of Kiihtelysvaara, Salpausselkä 11 II continues
in the east up up to Sykönvaara Sykönvaara and and Kannusvaara, Kannusvaara, as agreed unanimously by
researchers.
The large interlobate zone zone of of Tervasuo Tervasuo (Rainio, 1990) l-990) and and the large large esker of
YhdyshaIju Yhdysharju (Connection esker) esker) (Frosterus & Wilkman, 1915) 1915) continue from
Salpausselkä 11 II towards Jaamankangas Jaemankangas (Fig. 2). 2). These These interlobate formations fomations were
once included in in Salpausselkä 11 II (e.g. Repo, 1957). 1957).
Because Because general agreement is is stilllacking still lacking as to the relation of the North Karelian
end end moraines to to the Salpausselkäs, individual individual names nrmes have been proposed for each
apparently synchronous marginal deposit (Rainio, 1985b). 1985b). In North Karelia the icemarginal
systems corresponding to to the Salpausselkäs constitute three prominent prominent
rows (Rainio et al., al., 1995, Fig. 6 6 [VI)): IVIJ): the Tuupovaara, Koitere and Pielisjärvi end
moraines (Rainio, 1985b). These "continuations" of the Salpausselkäs are not,
however, parallel parallelover over their entire length, length, and so so the corresponding positions ofthe
ice ice front are not indisputable.
The above names are are used here, as are the names first first used by by researchers when
possible. possible. Otherwise the names are those given on basic map sheets.
It is not always easy to distinguish between between an ice-marginal formation and its its
proximal part. pa..--t. Here, then, the ice-marginal formation is considered to include those
components that have counterparts over a fairly long distance throughout the
ice-marginal formation entity; it it does not include parts that were clearly formed
later than the main chain, even though they may appear to join the latter. Such
parts are the Tervasuo complex and the complex of ice-marginal and and interlobate interlobate
deposits between Kiihtelysvaara and Pyhäselkä.
The Heinola deglaciation and the the Salpausselkä readvance refer refer to the deglaciation
and readvance stage of the continental ice sheet before the deposition of
Salpausselkä I as defined by Okko (1962, p. 150) (see Rainio, 1985a [II], 1991, 1993).
Salpausselkä I as defi.ned by Okko ( 1962, p. 150) (see Rainio, 1985a [II], 1991, 1993).