New Brunswick was his Country: The Life of William Francis Ganong. By Ronald Rees. x and 250 pp.; maps,diagrs., ills., bibliog., index. Halifax,Nova Scotia,Canada, 2016. C$24.95 (paper), isbn 9781771084482.          下载免费PDF全文

Alan Nash 《Geographical review》2018,108(4):627-630

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Aeolian environments,sediments and landforms ANDREW S. GOUDIE,IAN LIVINGSTONE and STEPHEN STOKES (eds) Publisher John Wiley & Sons,Chichester 1999 (325 pp) £85.00 ISBN 0‐471‐98573‐2     

David J. Nash 《第四纪科学杂志》2000,15(6):660-661

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Multiple calcrete profiles in the Tabernas Basin,southeast Spain: their origins and geomorphic implications     

David J. Nash  Roger F. Smith 《地球表面变化过程与地形》1998,23(11):1009-1029

The paper describes a sequence of Pliocene(? ) to Quaternary age calcretes developed within alluvial fan and fluvial gravels in the Tabernas Basin, Almería Province, southeast Spain. Calcrete profiles are described from sites adjacent to major tributaries of the Rambla de Tabernas. Six distinct calcrete units are identified within the basin. These have variable distributions but have developed in an identifiable evolutionary sequence. Two pairs of calcrete units are widely present across the basin preserving two former land surfaces. Each of the former land surfaces has been planated and subsequently buried by alluvial fan or fluvial gravels. A massive calcrete unit is present at the base of each gravel sequence, immediately in contact with the underlying bedrock, with a less well developed calcrete unit situated at the top of the gravel sequence. The lowest two calcrete units within the basin are more spatially restricted and are confined to the floors and flanks of incised drainage lines. The geochemistry, macro- and micromorphological properties and geomorphological positions of the calcrete units are outlined and, on the basis of this information, their mode of origin identified. Two main modes of calcrete genesis appear to be present: massive calcretes situated in direct contact with bedrock are suggested to have formed by groundwater processes, whilst calcretes situated at the top of gravel sequences are likely to have developed by pedogenic processes. Calcrete genesis is subsequently considered in the context of the reconstruction of the early phases of landscape development, and is suggested to have been controlled by phases of uplift and stability within the Tabernas Basin. © 1998 John Wiley & Sons, Ltd.  相似文献