Paleoenvironments of the Koobi Fora Formation, Turkana Basin, northern Kenya. Ph.D. thesis

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Abstract

The deposits of the Koobi Fora Formation preserve a record of changing paleoenvironments in the Turkana Basin for the period c4-0.6 Ma. The sedimentary sequence consists of 560 m of fluvial, lacustrine and deltaic deposits. Volcaniclastic sediments interbedded in the sequence allow for correlation on a local, basinal and regional scale, and provide a means of obtaining isotopic ages. Initiation of deposition occurred with ponding of a large lake in the region about 4.2 Ma. The local climate was relativley arid, and seasonal flooding of the river dmonated pedogenesis. At c3.6 Ma a second lake developed in the basin, filling with bioclastic and deltaic sediments within a period of 100 000 years. Tectonic uplift in the region to the northeast beginning about 2.5 Ma disrupted sedimentation in the basin, and resulted in a major unconformity at Koobi Fora. This was followed by development of a third large stable lake in the basin. Subsequent sedimentation in the period 1.9-1.4 Ma was controlled by periodic transgressions of the western remnant lake, and progradation of thin clastic wedges. These sequences preserve a profuse record of fishes, aquatic invertebrates and cryptalgal biolithites. Mammalian fossils are found throughout the sequence, and they record a habitat suitable to a diverse herbivore assemblage and associated carnivores. -from Author

Original languageEnglish (US)
Journal[No source information available]
StatePublished - Jan 1 1988
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Environmental Science(all)
  • Earth and Planetary Sciences(all)

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