Assemblage changes of foraminifera and palynomorphs across eocene - oligocene boundary in Southern Tanzania

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University of Dar es Salaam
A quantitative micropaleontological analysis was performed on outcrop and core samples split across a shallow boreholes (TDP 11) drilled by the Tanzania Drilling Project (TDP) Team in Southern Coastal Basins of Tanzania, yielding a recovery of 158 and 57 foraminifera species for the core and outcrop samples respectively and more than 30 species of palynomorphs were recognized. TDP 11 (UTM 37L; 560250/ 8983211) was drilled on Pande Formation and outcrop samples were collected from Mandawa basin in Pande Formation and Namandigura River (UTM 37L; 577270/ 8904844). The sediment successions cover the late Eocene to early Oligocene, with olive to greenish grey claystone principal lithology. Foraminifera recovery range from <38 to 261 specimens per gram while palynomorphs recovery range from < 5 to < 40 for a single analysed slide. Two planktonic foraminifera Biozone were recognised such as Hantkenina alabamensis and Pseudohastigerina naguewhiensis Biozones. The late Eocene-early Oligocene transional boundary (34 Ma) is placed by the last appearance (LA) of Hantkenina alabamensis. The palynomorphs and foraminifera assemblages recovered and planktonic/benthic (P:B) ratio shows a good succesion of data which was used in interpreting the paleoenvironment settings of Pande Formation during the late Eocene to early Oligocene period. The P:B ratio, benthic foraminifera assemblages and palynomorphs assemblages indicate the deposition environmrent as ranging from inner to middle shelf (shallow marine) environment.
Available in print form, East Africana Collection, Dr. Wilbert Chagula Library, Class mark (THS EAF QL368.F6T34E52)
Foraminifera, Palynomorphs
Emanuel, S. (2017) Assemblage changes of foraminifera and palynomorphs across eocene - oligocene boundary in Southern Tanzania, Master dissertation, Master dissertation,University of Dar es Salaam, Dar es Salaam.