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Yang Weimin(Dept.of Resources and Environment of Huainan Mining INstitute)Yang Yougeng(Regional Geological Survey of Anhui)  
The Mesozoic group occurs as a whole in Beihuaiyang area of Henan and Anbui provinces.For a longtime geologists have considered that the red bed of the area in Anhui all overlapped the Mesozoic volcanics so that the geo-logical maps for the same area can not match from of the provinces.Regional geological survey of 1:200,000and1:50,000 scale mapping combined with many years of research work dicclosed the Sanjinapu and Fenghuangtai Forma-tions underlying Mesozoic volcanics and determined the Mesozoic stratigraphic order.The established order provedesa reliable basis for description of the sedimentary evolution and tectonic alternation.
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