摘要:

A review on the position of the Pliocene‐Pleistocene boundary is presented. Uncertainties about the Calabrian stratotype and mammal faunas ill relation to absolute datings are discussed. In the North Sea basin and elsewhere a marked cold stage, the Praetiglian, began about 2.5 million years ago. It caused a partial extinction of the flora, which in Italy too is distinctly represented in fresh‐water as well as marine deposits. In the latter deposits, the extinction level coincides with the base of the Calabrian. The same type of extinction occurs at the base of the Villafranchian faunal sequence dated between about 2.5 and 3.1 million year‐s ago. The Calabrian base is therefore most probably at about 2.5 m.y., not at 1.8 m.y. as previously thought. The 1948 Recommendation on the position of the Plio‐Pleistocene boundary is still considere

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1974.tb00666.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

The stratigraphy of the Upper Quaternary in the Bay of Biscay based on planktie Fotaminifera is compared to that deduced by palynological study in the same matine core. An identical paleoclimatic interpretation is observed. However, the study of the palynological association has permitted the observation of several climatic variations in the terminal Würmian stages and in the Holocene. On the basis of the analysis, a correlation has been established in the Flolocene between the Boreal‐Atlantic limit and the two previous phases recognized by the planktie Foraminife

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1974.tb00667.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

Investigation of two Late‐Wisconsin and two sub‐recent core samples from the Greenland Ice Cap has shown the presence ol determinable pollen, wood fragments and other plant remains in the

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1974.tb00668.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

摘要:

Principles and terminology for classification of the Quaternary are discussed, including lithostratigraphy, biostratigraphy. morphostratigraphy, climatostratigraphy and chronostratigraphy. The main conclusion is a proposal for a common chronostratigraphical classification of the Quaternary in Norden (and partly continental NW Europe). The Quaternary is subdivided into the Pleistocene and the Holocene Series. The Pleistocene is further subdivided into several provisional stages (Weichselian, Eemian, etc.), based on the sequence of glacials/interglacials. but with the boundaries preferably defined by stratotypes. The Late Weichselian and the Flandrian (Holocene) are subdivided into chronozoncs (Bolling, Older Dryas, Allerød, Younger Dryas, Preboreal, Boreal, Atlantic, Subboreal, Subatlantic) with the boundaries dcfined in conventional radiocarbon years

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1974.tb00669.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1974.tb00670.x

出版商:Blackwell Publishing Ltd    

年代:1974

数据来源: WILEY