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在湖北省建始地区志留纪纱帽组中段发现多层含磷白云岩层。该套白云岩单层厚度薄,含较多黑色磷质砂砾屑,局部地段可构成磷矿层。它位于高水位体系域顶部,以其消失作为Ⅱ型层序界面的识别标志之一。含磷白云岩的发育说明该区或邻区存在局限海湾或泻湖环境,反映特列奇期鄂西地区半干旱型气候的特点。
Multi-layer phosphorus-bearing dolomite layers were found in the middle section of the Silurianmail Cap Group in Jianshi District, Hubei Province. The set of dolomite monolayer thickness is thin, with more black phosphorus grit, local sections can constitute a phosphorite layer. It is located at the top of the high-water system tract and disappears as one of the distinguishing marks of Type II sequence boundaries. The development of phosphorus-bearing dolomites indicates that there is a confined gulf or lagoon environment in this area or its neighboring area, reflecting the characteristics of the semi-arid climate in the western region of Telecchiz.