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Afrique ; Diatomée ; Formation d'Olorgosailie ; Géographie de l'Afrique ; Kenya ; Limnologie ; Paléo-environnement ; Paléobiogéographie ; Paléohydrologie ; Pléistocène moyen ; Quaternaire zone chaude ; Rift africain ; Sédiment fluviatile ; Sédiment
A detailed account is presented of the sediments and diatoms of the Middle Pleistocene Olorgesailie Formation. Facies distributions suggest a lake that was centred on the Koora Graben and which periodically expanded over an area to the north of Mt
Olorgesailie. The mineralogy and provenance of the sediments are discussed. The stratigraphic distribution of diatom associations suggest many lake level fluctuations. Alkalinities varied between about 5 and 85 meq/l. Based on alkalinity changes, three main

chaude ; Sédimentation pollinique ; Zone intertropicale
Etude de la pluie et de la sédimentation polliniques actuelles dans le bassin du lac Turkana à partir d'échantillons de surface et de sédiments actuels du lac. Etude palynologique de 17 échantillons plio-quaternaires. Conclusions paléoclimatiques

Late Quaternary sediments and climatic change in Swaziland in Palaeoecology of Africa and the surrounding islands. Volume 15. Southern African Society for Quaternary research. Proceedings.

Bosumtwi, lac ; Ghana ; Géographie de l'Afrique ; Holocène ; Paléo-environnement ; Paléobiogéographie ; Paléoflore ; Pléistocène supérieur ; Quaternaire supérieur ; Quaternaire zone chaude ; Sédiment lacustre ; Végétation ; Zone intertropicale
A further 12 species of tree brave been identified from leaf fossils preserved in terminal Pleistocene-early Holocene lacustrine sediments exposed above the present shore of Lake Bosumtwi. Our earlier finding has been confirmed that forest

Spatial variations in linear dune morphology and sediments in the Namib sand sea in Palaeoecology of Africa and the surrounding islands. Volume 15. Southern African Society for Quaternary research. Proceedings.

Etude palynologique des sédiments quaternaires du lac Abiyata (Ethiopie) in Palaeoecology of Africa and the surrounding islands. Volume 14.

Lithostratigraphy of Cenozoic sediments between Cape Town and Eland's Bay in Palaeoecology of Africa and the surrounding islands. Volume 15. Southern African Society for Quaternary research. Proceedings.
This paper presents the essence of recent lithostratigraphical studies on a suite of over 250 boreholes drilled in largely unconsolidated Cenozoic sediments between Cape Town and Eland's Bay. Early Pliocene cold-water transgression laid down

Aspects of a suite of Quaternary conglomeratic sediments in the Kuiseb valley, Namibia in Palaeoecology of Africa and the surrounding islands. Volume 15. Southern African Society for Quaternary research. Proceedings.
A Quaternary terrace sequence records the initial aggradation within the Kuiseb River and its major tributaries, subsequent to canyon incision. Palaeo-dunes are interbedded with fluvial sediments in the distal reach which implies the presence

The Malawi Rift is one of the youngest sections of the African Rift Valley System. The initial rift fill comprises fossiliferous Pliocene sediments. Early sediments in the extreme north were conformably overlain by pyroclastics erupted from
nearer to the modern lake. A large pyroclastic flow swept into northern Malawi from the Rungwe area just over 11 000 300 yr BP. An ash layer in the sediments flooring Lake Tanganyika, dated at 11 690 300 yr BP, may be the air-fall equivalent of the same

Les moraines du stade IV ont été formées par un glacier dont le retrait a débuté avant 5 425 ou 6 277 BP (suivant que l'on admet un taux de sédimentation constant ou variable).

Accumulation littorale ; Ancien rivage ; Estuaire ; Gabon ; Géographie de l'Afrique ; Holocène ; Littoral ; Madréporaire ; Mollusque ; Niveau marin ; Paléobiogéographie ; Quaternaire marin ; Quaternaire zone chaude ; Sédiment marin ; Thanatocénose

qui ont connu leur plus grande extension entre 25 000 et 22 000 BP et par l'étude des sédiments marins qui ont enregistré les fluctuations à long terme du débit du Niger et du Nil.

humid conditions in the desert during Isotopic Stage 3. The carbonate cementing of the fluvial pebble conglomerate forming the 40 m terrace against the S bank took place at the same time. The sequence of aggradation and removal of sediments in the canyon

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