摘要:

The rich vertebrate fauna of the Upper Freshwater Bed of West Runton, Norfolk. England (pollen assemblage zone Cr II) is described and related to vegetational conditions based on analysis of fossil pollen and macroscopic plant remains. The general picture is of fishes associated with aquatic plants in a slow‐flowing river, amphibious vertebrates living in water‐side habitats, and a terrestrial fauna generally reflecting a regional mixed oak forest cover, but also including grassland voles associated with local herb‐dominated communities on the river floodplain. The fossil assemblage appears to have accumulated largely from the remains of terrestrial vertebrates washed in as the river eroded its banks. A reassessment of the fossil voles indicates that only five species occur, although ten were previously described. The sparse fauna from the overlying marine gravel (zone Cr III) is also discussed. On the basis of vertebrate faunas and other evidence, sites in England and Germany arc correlated with the type Crom

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1975.tb00680.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

Isopollen maps ofBetula, Pinus, Alnus, Corylus, andUlmusfor 4000, 6000, and 8000 B.P. and ofPicea, Tilia, andQuercusfor 4000 and 6000 U.P. are presented for Finland. The maps show the major geographical patterns in pollen composition for these three time intervals. Principal components analysis is used as a means of detecting the major gradients in the data. Over 50% of the total variance in the data for each of the three time intervals can he related to major geographical patterns. These patterns emphasize the distinction in pollen composition between southernmost Finland, central Finland, and the extreme north. Changes in the position of the ecotonal boundaries between these areas with time are discussed on the basis of the numerical analyses.

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1975.tb00681.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY

摘要:

A long sequence of open‐coast tidal flat deposits with a restricted, mainly boreal fauna, comprises theTapesandMactraZones. Characteristic species areVenerupis aurea, Spisula arcuata, Arctic islandicaandLentidium complanatum. This stage is provisionally correlated with the Upper Pliocene of the North Sea Basin. During the time of deposition of theSerripesZone the basin apparently deepened and the fauna greatly diversified with immigration of arctic elements. It went back finally to beach‐deposit conditions. The characteristic species —Serripes groenlandicus, Macoma praetenius, andBeta borealis —are also characteristic of the Early Pleistocene of the North Sea Basin with which theSerripesZone is provisionally correlated. The climate is interpreted as having been colder than that of theTapesandMactrazones. A preliminary list of the Mollusca i

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1975.tb00682.x

出版商:Blackwell Publishing Ltd    

年代:1975

数据来源: WILEY