Abstract
Sediments from the Paleozoic glaciation of Gondwana and overlying Lower Permian (Asselian) sediments from the Ruhuhu Basin (Ngaka Sub-basin, Sw Tanzania) are described and interpreted. All results were obtained from surface and subsurface (42 boreholes) observations and analysed by sedimentological criteria. Different facies development of tillites and varved shales with drop stones are compared, structural maps, i.e. palaeomorphology of the pre-Karoo basement, isopach configuration of the glacial sequence and depositional surface of the coal forming sequence are presented and discussed. Textural and sedimentological inventary evidence a tensional stress field of a slowly subsiding and extending basin. A conclusive plaeogeographic and depositional basin model is introduced with isolated glaciated mountainous areas surrounded by a peri-glacial lake which later was superseded by braided to meandering river type sedimentation and the formation of prolific coal swamp development.
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