川东北二叠纪吴家坪期牙形石（刺）序列及其世界对比

对四川省宣汉县渡口和南江县桥亭吴家坪期地层的系统采集和研究结果表明，吴家坪期至少包括７个牙形石带，自下而上为Ｃｌａｒｋｉｎａｄｕｋｏｕｅｎｓｉｓ带，Ｃ．ａｓｙｍｍｅｔｒｉｃａ带，Ｃ．ｌｅｖｅｎｉ带，Ｃ．ｇｕａｎｙｕａｎｅｎｓｉｓ带，Ｃ．ｔｒａｎｓｃａｕｃａｓｉｃａ带，Ｃ．ｏｒｉｅｎｔａｌｉｓ和Ｃ．ｉｎｆｌｅｃｔａ带。其中，前３个带的层位低于一直作为吴家坪期早期的Ｃ．ｌｉａｎｇｓｈａｎｅｎｓｉｓ带。吴家坪阶的顶界以置于Ｃ．ｉｎｆｌｅｃｔａ带与Ｃ．ｓｕｂｃａｒｉｎａｔａ带之间较妥。同时，建立了Ｃｌａｒｋｉｎａｄｕｋｏｕｅｎｓｉｓ，Ｃ．ａｓｙｍｍｅｔｒｉｃａ，Ｃ．ｂｉｚａｒｒｅｎｓｉｓ，Ｃ．ｄａｘｉａｎｅｎｓｉｓ，Ｃ．ｄｅｍｉｃｏｒｎｉｓ，Ｃ．ｉｎｆｌｅｃｔａ，Ｃ．ｌｏｎｇｉｃｕｓｐｉｄａｔａ等７个新种。

SUCCESSION OF WUCHIAPINGIAN CONODONTS FROM NORTHEASTERN SICHUAN AND ITS WORLDWIDE CORRELATION

An investigation on the conodonts from the Wuchiaping Formation in the Dukou Section of Xuanhan County and the Nanjiang Section of Nanjiang County, Sichuan Province on a saniple bysample basis shows that the Wuchiapingian succession includes at least seven conodont zones. They are, in ascending order, the Clarkina dukouensis,C. asymmetrica ,C. leveni,C. guanyuanensis,C. transcaucasica,C. orientalis and C. inflecta Zones. Among them, the former three zones are stratigraphically lower than the C. liangshanensis Zone that used to be regarded as the Earlist Wuchiapingian in age. The upper boundary of Wuchiapingian Stage is suggested to be drawn between the C. inflecta Zone and the C. subcarinata Zone. Seven new species, namely, Clarkina dukouensis, C. asymmetrica, C. bizarrensis, C. daxianensis, C.demicornis, C. inflecta and C. longicuspidata are described.