摘要:

Six cores were selected from 46 collected in the SW part of the Atlantic Ocean to compare the three main methods of constructing Pleistocene paleoclimatic curves by means of planktic Foraminifera. It was found that the method based on a study of the whole fauna yields more details and represents the degree of the relative climatic changes better, whereas the method based on the ratio between theGloborotalia menardiicomplex andG. inflataexagerates the large scale temperature oscillations. However, this exaggeration makes the separation of glacial, interglacial, and interstadial epochs much easier. Paleoclimatic curves based on the sinistral: dextral ratio ofGloborotalia truncatulinoidesdo not coinicde with those prepared utilizing the two previous methods. thus, the coiling direction ofGloborotalia truncatulinoidescannot be utilized as a paleoclimatic criterion.

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1973.tb00973.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

From central East Greenland, C14ages between 19,500>40,000 years B.P. have been obtained for six samples of marine bivalve shells. The ages seem to be consistent with geological observations and form the basis for a tentative chronology for the Weichselian ice age in the region. It appears that the maximum glaciation during Weichselian times was attained more than 40,000 years ago, and that since then ice‐free areas have existed. This assumption agrees with evidence of botanical refugia in the region, and the restricted glacier activity especially during the Upper Pleniglacial (ca. 30,000–15,000 years B.P.) is explained by a reduced supply of moisture. A comparison with evidence from other parts of Greenland indicates that different glacial histories can be expected for different sectors of the Greenland Inland

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1973.tb00974.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

Recent stratigraphical, morphological, and radiocarbon data indicate that most of eastern Finland north of North Karelia was deglaciated in early Flandrian times between about 9500 and 9000 B.P. The Younger Dryas ice margin, represented by the Salpausselka ridges in southern Finland, continued through the North Karelian end‐moraines across the eastern border of the country. In Soviet Karelia it is possibly represented by the so‐called East Karelian end‐moraines known from earlier st

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1973.tb00975.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY