Abstract
Palynological studies of outcrop and borehole samples from coal-bearing Karroo (Lower Permian) deposits in the Ketewaka area of southwest Tanzania show a distinct change in the composition of spore/pollen assemblages approximately in the middle of the sequence, the most prominent feature being differences in the representation of monosaccate and disaccate species. This is in line with results of earlier studies in the adjacent Mchuchuma area. The change in spore/pollen content is taken as evidence of a considerable floral change affecting an extensive area and probably climatically controlled. The floral change coincides with a distinct change in sedimentation, from sand with coal to mud or clay with coal, except for a part of the Ketewaka area, where sandy sediments continued to be deposited.
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