Browsing by Author "Umer, Mohammed"

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  • Foerster, Verena; Juninger, Annett; Langkamp, Oliver; Gebru, Tsige; Asrat, Asfawossen; Umer, Mohammed; Lamb, Henry F.; Wennrich, Volker; Rethemeyer, Janet; Nowaczyk, Norbert; Trauth, Martin H.; Schaebitz, Frank (2012-10-01)
    East African paleoenvironments are highly variable, marked by extreme fluctuations in moisture availability, which has far-reaching implications for the origin, evolution and dispersal of Homo sapiens in and beyond the ...
  • Marshall, Michael H.; Lamb, Henry F.; Huws, Dei; Davies, Sarah J.; Bates, Richard; Bloemendal, Jan; Boyle, John; Leng, Melanie J.; Umer, Mohammed; Bryant, Charlotte (2011-08)
    Magnetic and geochemical core data spanning the last 17,000 years are correlated with new seismic stratigraphy from Lake Tana, Ethiopia, to infer past lake-level change and hence effective precipitation. The data confirm ...
  • Lamb, Henry F.; Bates, C. Richard; Coombes, Paul V.; Marshall, Michael H.; Umer, Mohammed; Davies, Sarah J.; Dejen, Eshete (2007-02-01)
    High-resolution seismic data from Lake Tana, the source of the Blue Nile in northern Ethiopia, reveal a deep sedimentary sequence divided by four strong reflectors. Data from nearshore cores show that the uppermost strong ...
  • Gil-Romera, Graciela; Lamb, Henry F.; Turton, David; Sevilla-Callejo, Miguel; Umer, Mohammed (2010-10)
    Bush encroachment is a significant phenomenon in savanna environments as it affects wildlife and local livelihoods by preventing new pasture generation. In this article we present a 2000-year record of vegetation change ...