摘要:

Amplification is made to some of Butzer's comments on various Pleistocene ‘periglacial’ phenomena in southern Africa. In particular, the ‘nivation’ cirques occurring above 2,000 m in the Drakensberg‐Lesotho upland are now thought to have been formed by a combination of frost‐shattering and solifluction wasting. Because of a gradational sequence from purely frost‐shattered forms in central Lesotho to pronounced cirques in the Drankensberg, a lateral palaeoclimatic variation is suggested with a somewhat higher precipitation in the latter area. This contention is supported by palae

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1973.tb00249.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

An attempt is made to show that the change of angular momentum of the earth, caused by glaciations, may compensate the slowing down effect from tidal friction forces and even reverse the polarity in the terrestrial magnetic field.

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1973.tb00250.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

There exposures in an outer end moraine ridge at Autre Okstindbredal, north Norway, are described and interpreted. The presence of perennially frozen ground is attributed to the present or very recent climate of the area and suggest the occurence of true sporadic permafrost. Several buried soil horizons including podzols are recognised within the moraine ridge sections. These are considered to be derived. It is thought that their occurance as imbricate stress is best explained by a basal freeze‐in mechanism associated with marginal thrusting when the local glacier possessed a sub‐polar thermal régime. This freeze‐in phase is of late Neoglacial age but not necessarily associated with the widespread eighteenth century advance in Scandinavia. The soils in part date from the postglacial climatic o

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1973.tb00251.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY

摘要:

To understand how the present sea impresses a record of its level on the coast is a prerequisite for reading the records of past sea levels. A first approximation for mean rates of coastal retrogradation since the Flandrian Transgression on the microtidal, open ocean, Meditrerranean‐ climate coast of Western victoria is: (1) Penultimate Glacial basalt 0 cm/yr (no change in gross geometry in spite of quarrying and channel formation). (2)Last Interglacial aeolianite 4 cm/yr. (3) Lower Cretaceous arkose 0.9 cm/yr (4) Lower Cretaceous siltstone 1.75 cm/yr. The rates are so divergent that the record of sea level changes is impressed quite differently on these respective lithologie

ISSN:0300-9483    

DOI:10.1111/j.1502-3885.1973.tb00252.x

出版商:Blackwell Publishing Ltd    

年代:1973

数据来源: WILEY