Abstract：A radiational bedding was found in the Lower Cretaceous mudstone and sandstone section located at Dongyangshugou village in Luanping County of Hebei Province， where the sandstone is suddenly thickened.In this kind of bedding，the laminas radiate and incline from the thin side toward the thick side of the strata，the angle between the lamina and the interface of the strata is increasing from top to bottom.At the top，the angle between the lamina and the interface of the strata is near 0°. At the bottom，the angle between the lamina and the interface of the strata is about 90°. Interface of the strata is nearly horizontal，that is to say，there is no record in reference about this kind of radiational bedding. In the earlier study result in this area，the incline angle of the lamina at the bottom is 90°，which can not be formed by normal fluid flow. This kind of bedding was considered was cross bedding，and the locally thicken sandstone with this kind of bedding was thought as river channel，so the distribution of the thick sand was considered as perpendicular to the lake shore.By careful observation and study，this kind of radiational bedding is a kind of syngenetic bedding controlled by the growth normal fault.The sandstone with this kind of bedding is not river channel sand，the phenomenon of locally sudden change in thickness is caused by growth fault.The sedimentary environment of the sandstone is lobe of delta front，according to this model，the distribution of the thick sand is considered as parallel to the growth fault and the lake shore.
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