The Nihewan Basin, which covers an area of some 150¡«200 km2, is situated in the transition zone between the North China Plain and the Inner Mongolian Plateau. The basin is dissected along a southwest-northeast track by the Sanggan River and provides extensive sedimentary exposures consisting of well-developed Late Cenozoic lacustrine-fluvial deposits rich in mammalian fossils known as the Nihewan Fauna. The Nihewan Group lacustrine-fluvial sediments, named from the type locality at the village of Nihewan, Yangyuan county, Hebei province, China, contain several important Paleolithic sites, such as Xiaochangliang(XCL), Donggutuo(DGT), Xujiayao(XJY) etc.
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