摘要:

In 1984 the centenary of Gerard De Geer's invention of the clay‐varve dating method was celebrated with a Nordic conference in Stockholm. This paper presents the history of the method as an introduction to the following pages summarizing some of the papers presented at that meetin

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1985.tb00894.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Book reviewed in this article:Current Research. Vol. 1. pp. i‐vii. 1–112. A Peopling of the Americas Publication. Center for the Study of Early Man. University of Maine at Orono. Ma

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1985.tb00895.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

A survey of the revised lateglacial varve chronology is given. Almost all revisions are based on new, independent measurements not yet finished. Compared with the old time scale, the preliminary datings (calendar years ± a margin of error) of the ice margin retreat are ‘older’, mainly due to the fact that the postglacial varve chronology has been extended by 365 years. This implies that the so‐called zero year (sensuDe Geer 1940: limit of late glacial and beginning of postglacial varve sedimentation). earlier estimated at 6,923 B.C. (Nilsson 1964), is now dated 7,288 B.C. According to the new time scale, deglaciation from Stockholm to the area of zero‐year formation in Indalsälven's valley lasted about 1,190 ± 40 years, compared with 1,073 years in De Geer's (1940) time scale or 1,092 in Jarnefors' (1963). Preliminary varve graph correlations, which are still very weak concerning the Fennoscandian moraine zone, indicate that the ice receded from Högsby, northwest of Kalmar at approximately 10,700+200−300B.C. At localities just to the north of the Fennoscandian moraines, deglaciation started about 8,750+50−150years B.C. according to the new varve measurements, and the ice front receded in southern Stockholm 8,470+40−140B.C. Varve dating now gives older ages (calendar years) than14C‐dating; about 200–400 years older regarding some ice margin posi

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1985.tb00896.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Book reviewed in this article:Bowen. D. O. (ed.) 1954:Quaternary Science Reviews

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1985.tb00897.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Varve series of fine‐grained glacial sediments have been studied in an area of the Baltic Ice Lake near the border between the provinces of Blckinge and Smalånd, southeastern Sweden. The main purpose of the investigation was to establish a more reliable connection than earlier between the varve chronologies of the Karlskrona area (Ringberg 1971 and 1979) and the Kalmar area (Rudmark 1975). The varve series have been linked to the local chronology of Antevs (1915) as the most recent revision of the Swedish time scale has not yet been completed. The investigation has led to two alternative connections. There are no differences between the alternatives in the southern part of the study area. In the middle of the area there is a difference of 17 years and in the northern part of the area there is a difference of 85 years between the two alternatives. Continued investigations will show which is the most reliable alternative. At present, the uncertainty of the ice recession chronology is at most 85 years in the investigation ar

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1985.tb00898.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Several new varve measurements have been made at Skövde and Tibro in the middle Swedish end moraine belt to the east of Mount Billingen, Västergötland. Some varve sequences are very long, containing 400–700 varves, but correlations are still difficult to make. This is probably due to stagnation and advances of the inland ice margin, indicated by disturbed varves and by sand or till on the clay. SE of Skövde a series of more than 560 varves is covered by a glaciofluvial delta. This delta must have been formed not far from the ice margin. After a slow ice recession at Tibro ‐ 17 km in 400–600 years ‐ advances are indicated by the stratigraphy in the northern parts

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1985.tb00899.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Book reviewed in this article:Brenchley, P. J. (ed.) 1984:Fossils and Climate.

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1985.tb00900.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

In the Ångermanälven river valley in northern Sweden the Swedish geochronological time scale has been connected with the present (1978) by means of varved clayey‐silty sediments. A 75‐year‐old problem has thereby been solved. Ragnar Lidén's previously calculated gap of 980 years between his youngest varve 7,522, found at Prästmon, and the historical year 1900 A.D. should be extended by 365 years. This implies that the zero year in Döviken (Indalsälven river valley), reviewed by Borell and Offerberg and commonly used in the Swedish time scale to mark the boundary between the finiglacial and postglacial epochs is Sweden, should be dated to 7,288 B.C. (9,238 B.P.) instead of the old date 6,923 B.C. given by Nils

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1985.tb00901.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

A revised calculation of the age of the zero in the Swedish time scale by the aid of published varve diagrams (Eiden 1913; Borell&Offerberg 1955) confirms the earlier calculation by E. Nilsson (1960, 1968). The age of the zero, including 365 additional years for the extension of the time scale to present time (Cato 1985), should be historical – 7,288 (9,238 B.P.

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1985.tb00902.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY

摘要:

Book reviewed in this article:Mörner, N‐A.&Karlén, W. (eds.) 1984:Climatic Changes on a Yearly to Millennial Ba

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1985.tb00903.x

出版商:Blackwell Publishing Ltd    

年代:1985

数据来源: WILEY