摘要:

On the basis of opinions held by leading Soviet geologists the author, in a paper of 1957, concluded that the immigration started from an ice‐dammed lake in the valley of R. Onega, emptying into the White Sea, from which the animals had been sluiced up in front of the advancing ice‐sheet. Recent geological work suggests that the Würm ice‐cap of northern Europe (and adjacent Arctic regions) extended in northern Russia as far eastwards as the Urals, creating a continuous network of ice‐dammed waters along the ice‐front. Consequently, the relicts may have come from considerably more eastern regions than the Onega Ice Lake. The presence of relicts in lakes of the Kola Peninsula is also discussed. It is shown that these once enigmatic relict localities can be explained in the light of recent geological research, which suggests that the White Sea basin experienced a freshwater phase during the Würm deglaciation, thus allowing the relicts, which do not tolerate higher salinities, to reach even the Kol

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1976.tb00327.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

A pollen diagram from Säynäjälampi, a small lake in Kuusamo, NE Finland, provides the basis for a description of the protocratic vegetation following the deglaciation of the area. Special attention is paid to the occurrence ofHippophaë rhamnoides.Fossil pollen of this species, which, though decidedly heliophilous in character, shows a broad ecological range in its present‐day habitats, may serve to indicate an open pioneer vegetation. A comparison of pollen diagrams published for Finland in whichHippophaë rhamnoideshas been identified reveals evidence of metachronism in the pioneer vegetation, related to the history of the deglaciation, shore‐line displacement, and forestal

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1976.tb00328.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY

摘要:

Detailed mapping of well‐preserved moraine systems fronting 17 small alpine glaciers in Sarek National Park in Swedish Lapland reveals two Holocene intervals of prolonged glacier expansion, each involving a complex of minor fluctuations. The younger interval, which corresponds to the Little Ice Age, experienced advances that culminated about A.D. 1916–1920, 1880–1890, 1850–1860, 1800–1810, 1780, 1700–1720, 1680, 1650, and 1590–1620. The older expansion interval, which probably centered around 250014C yr B.P., experienced several minor fluctuations spread through about 600 years.Lichen data collected on moraine systems in Sarek are internally consistent from glacier to glacier. Lichen measurements on surfaces of known age in Sarek and nearby Kebnekaise match closely, allowing moraine correlations between these areas. Several older expansion intervals are recorded in the Kebnekaise Mountains. Taken together, the two sequences suggest that a series of prolonged expansion intervals, each similar to the Little Ice Age, has characterized the Holocene in Lapland. Fluctuations of the Scandinavian Ice Sheet in Sweden suggest that this series of Little‐Ice‐Age events extends back into the late Weichsel in the form of the Younger Dryas and Olde

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1976.tb00329.x

出版商:Blackwell Publishing Ltd    

年代:1976

数据来源: WILEY