A large amount of data of the latest regional geoglogy and the latest correlation data of layers and rock formation have been quoted , and a description of distribution of crystalline basement , formation , evolution as well as the distribution characteristic of the fracture belt of ordos basin have been made in this paper , and the paper also pointed out that the g - layer which lies between the base of the basin and tg reflector , is the extension of basinward of guandaokou of jixian system . the layer of changcheng system and jixian system , which had been divided before , can be correlated with the exposed huangqikou group and wangquankou group in helan mountain , and divided into qingbaikou system . so , the paper denied the viewpoint of the existence of aulacogen in hutuo period and middle proterozoic in this basin
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