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- W2075869246 abstract "Abstract Even though the study of sediments associated with the Kenya Rift Valleys is far from complete, sufficient is known about them to reveal general patterns of sediment distribution and depositional histories. Many of the recognised geomorphological processes such as weathering, erosion, transportation and deposition which occur in the Kenyan rifts have been influenced or interrupted by tectonic and volcanic activity. Voluminous eruptions of lava not only alter the landscape, for example, but they also preserve the pre-existing surfaces by burying them rapidly, thereby “freezing” into the stratigraphic records numerous examples of the geomorphological processes and their products that occur in the rifts. The combination of tectonic, volcanic and sedimentary activity has led to the accumulation of the most comprehensive Cainozoic continental sedimentary and fossil record known in Africa. Special factors relating to the distribution of fossils are the geochemical composition of the parent rocks from which the sediments were derived and the distribution of centres of sediment accumulation in basins as well as in upland areas affected by volcaniclastic deposition. There are several special effects related to sedimentation in rift settings. These include somewhat abnormal relationships between the sizes of basins and that of their watersheds, and the existence of rainshadow over much of the rift trough. In the vicinity of low silica alkaline volcanoes, the normally leisurely pace of calcrete pedogenesis has on occasions been greatly accelerated. The geographic distribution of major sedimentary bodies through time shows that certain areas were more prone to undergo repeated episodes of sedimentation than were others. For example, the Tugen Hills/Baringo area has been a centre of intermittent sediment accumulation for more than 17 Ma, while Tiati to the north and Tenges to the south have remained remarkably sediment free for a comparable period of time on account of their positive relief which has persisted since at least the middle Miocene." @default.
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- W2075869246 title "Patterns of sedimentation and fossil distribution in the Kenya Rift Valleys" @default.
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- W2075869246 doi "https://doi.org/10.1016/0899-5362(94)90053-1" @default.
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