摘要:

A 140.2 m deep boring (BH 81/29) from the central North Sea (British sector) has been investigated for its foraminiferal content. Fourteen assemblage zones are identified, and these are correlated with other records from the North Sea region. The stratigraphical interpretation of BH 81/29 is supported by palaeomagnetic data and by amino acid dates and thermoluminescence dates from the same boring. Foraminiferal zones 14 to 8, from the bottom of the core, have been referred to the Early Pleistocene. Zones 7 to 4, which occur above the Bruhnes/Matuyama boundary, seem to belonged in the Middle Pleistocene, and zones 3 to 1 are referred to the Late Pleistocene. A characteristic feature of the present sequence is that a major part of the Quaternary record seems to be missing. As is also known from other areas of the North Sea, interglacial deposits are especially badly represented.

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1988.tb00957.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1988.tb00958.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

A 12km long terrace along the estuary of the Grande Rivière de la Baleine, northern Québec (55d̀17'N, 77d̀47'W), has been locally modified by seven large landslides during the last 3,20014C years. The oldest undated landslide occurred between 3,200 B.P(formation of the upper terrace) and 2,200B.P., i.e. the radio carbon age of the second oldest landslide. The third one occurred around 900B.P. sometime before peat started to accumulate on the flowbowl floor. The more recent landslides were dendrochronologically dated. They were formed in less than 30 years, i.e. in 1818 (2 synchronous landslides), 1839 and 1846 A.D. These 19th‐century landslides were dated through a comparative analysis of growth curves derived from buried trees found in the flowing sediments or from tilted and cut trees, with the regional master chronologies and the northern Québec light‐ring chronology, using more specifically the 1816 and 1817 light‐ring years. The 1818 landslides occurred during the growing season (July), whereas the 1839 and 1846 landslides were formed during spring. The occurrence of numerous landslides during this short period seems to be related to sustained cool and humid climatic conditions that may have enhanced the subsoil wat

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1988.tb00959.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

Book reviewed in this article:Van der Veen, C. J.&Oerlemans, J. (eds.) 1986: Dynamics of the West Antarctic Ice Sheet.

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1988.tb00960.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

In an area in southwesternmost Värmland, western Sweden, ice‐marginal deposits have been mapped and studied. They can be correlated with the Norwegian Younger Dryas to Preboreal Ås, Ski and Aker ice‐marginal ridges, and with lines of ice recession earlier constructed in Dalsland. Together they give valuable information about the mode of deglaciation in southern Scandinavia. They indicate a pattern of deglaciation with intense upbreaking by calving of the ice eastwards from the Oslo Fjord and northwards in the Vänern basin. This process caused a downdraw of ice around the highland between those areas. Ice streams and, later, valley glaciers were formed in the large Årjäng‐Koppom and Glafsfjorden‐Byälven valleys. Between them a lobe‐shaped, stagnant ice cap was isolated from further supply from the main ice sheet in the north. This ice cap, here called the Dal lobe, wasted down with a complicated pattern from the west,

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1988.tb00961.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

A map has been reconstructed representing the large‐scale glacial and glaciofluvial morphology of Northern Karelia and the adjacent area of Soviet Karelia. Observations have been made on the directions of glacial striae and on the distribution of sub‐aquatic and supra‐aquatic terrain in order to obtain a consistent picture of the course of deglaciation in the area and the factors affecting it. The map indicates that the behaviour of the glacier during the deglaciation was largely governed by the distribution of sub‐aquatic and supra‐aquatic areas. The marginal zone of the ice sheet was divided into two large lobes in this area. The Finnish Lake District Lobe terminated mostly in water, giving rise to massive glaciofluvial accumulations, while the North Karelian Lobe flowed on the land above the highest shore levels, pushing up several more or less discontinuous narrow end‐moraine ridges. Relatively large glaciofluvial deposits were also formed in the supra‐aquatic area in places where the ice margin terminated in a local ice‐dammed lake. It is evident that the Salpausselkä I and II end‐moraines extend as continuous formations only to the zone where the former ice margin rose onto dry land during the deglaciation phase. The spatial and temporal differences in the glacial dynamics and differing depositional environments gave rise to the complex glacial morphology o

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1988.tb00962.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

Book reviewed in this article:Janossy, D. 1986: Pleistocene Vertebrate Faunas in Hungary.

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1988.tb00963.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

Since 1980 the authors have been using a mechanized Gik corer for coring in marshlands and peat bogs. Final modifications to the equipment are described and shown in photographs and drawings.

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1988.tb00964.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1988.tb00965.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY

摘要:

Moraine‐like ridges in the Skäralid canyon at the Söderåsen horst, Southern Sweden, are interpreted not as features formed during the deglaciation of the Weichsel ice sheet, but as forms related to lateglacial tundra conditions. This is suggested by their location and morphology and is supported by TL‐dates of the sandy matrix in two of the ridges, yielding ages between 10,400 and 10,800 B.P. The environmental significance of the ridges is further discussed on the basis of their sedimentology. As severe wind action in lateglacial time in this part of Sweden is implied by numerous wind‐polished rocks, the ridges may have formed as protalus ramparts or end moraines in front of snowfields or small glaciers, nourished by strong snowdrifting. Alternatively, small openwork ridges may be incipient fossil rock

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1988.tb00966.x

出版商:Blackwell Publishing Ltd    

年代:1988

数据来源: WILEY