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长江中、上游地区,在栖霞组与茅口组之间普遍发育有一套黑色钙质炭质页岩为主夹似层状(或称“眼球状”)灰岩,以富含Cryptospirifer腕足动物群为特征的地层。黄汲清、曾鼎乾(1948)在研究四川华蓥山二叠系之分层时,将其命名为“五十三梯系”,时代定为早二叠世,以Cryptospirifer的出现作为茅口组的伊始。盛金章(1962)沿用了这一划分意见,将我国南方广大地区下二叠统以碳酸盐岩相沉积为主的地层,划分为栖霞组(其下有煤系
In the middle and upper reaches of the Yangtze River, a set of black calcareous carbonaceous shale is widely distributed between the Qixia Formation and the Maokou Formation as the main clathrated (or “eyeball”) limestone. The Cryptospirifer brachiopods For the characteristics of the formation. Huang Jiqing, Zeng Dingqian (1948) In the study of the stratigraphic division of the Permian in the Huaying Mountains in Sichuan Province, he named it “Fifty-three Ladders,” the Age as Early Permian, and the emergence of Cryptospirifer as the Maokou Formation The beginning. Sheng Jinzhang (1962) follows this division of opinion and divides the formations of the Lower Permian mainly carbonate sediments in the vast areas of southern China into Qixia Formation (under which coal measures