Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

If You Use a Screen Reader

This content is available through Read Online (Free) program, which relies on page scans. Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.

Geomorphological Evidence and Pleistocene Refugia in Africa

Janet E. Nichol
The Geographical Journal
Vol. 165, No. 1 (Mar., 1999), pp. 79-89
Published by: geographicalj
DOI: 10.2307/3060512
Stable URL: http://www.jstor.org/stable/3060512
Page Count: 11
  • Read Online (Free)
  • Download ($10.00)
  • Subscribe ($19.50)
  • Cite this Item
Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Geomorphological Evidence and Pleistocene Refugia in Africa
Preview not available

Abstract

New geomorphological evidence from satellite images is interpreted in the light of recent work on Quaternary desert advance in West and Central Africa to suggest that regions currently supporting tropical lowland rain forest were during the Quaternary period, covered by windblown sand in the form of linear desert dunes. The evidence suggests that the last glacial advance at approximately 18kyr BP was not the most extensive and that the Sahara, like the Kalahari, extended to within one or two degrees of the Equator during the Quaternary period. Thus the southern limit of fossil dunes at the West African coast is not a climatic limit. Since desert dunes indicate the minimum former extent of desert conditions, the findings have implications for Pleistocene refugia in Africa and may explain both the relative paucity and high degree of endemism observed among African biota.

Page Thumbnails

  • Thumbnail: Page 
[79]
    [79]
  • Thumbnail: Page 
80
    80
  • Thumbnail: Page 
81
    81
  • Thumbnail: Page 
82
    82
  • Thumbnail: Page 
83
    83
  • Thumbnail: Page 
84
    84
  • Thumbnail: Page 
85
    85
  • Thumbnail: Page 
86
    86
  • Thumbnail: Page 
87
    87
  • Thumbnail: Page 
88
    88
  • Thumbnail: Page 
89
    89