Abstract
The alluvial terraces of the Lower Vaal River, South Africa, are well known for their unique strati-graphic record of the Pleistocene period and as the focus of an apparent Acheulian sequence. Recent field examination indicates that this terrace suite is both more complex and more systematic than previously understood, extending downstream from the classical study area at Windsorton and Barkly West to the Orange-Vaal confluence. An expanded stratigraphic framework for the late Pliocene to early Pleistocene Older Gravels is described, while major subdivisions for the Younger Gravels (with Middle Pleistocene fauna and Acheulian occurrences) are proposed. A new late Pleistocene to Holocene lithostratigraphic entity, the Riverton Formation (with five members), is defined. Finally, problems of paleoenvironmental interpretation are discussed.
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