Detailed conodont analysis on the Yangjuan-Chupiwa section, Xinmin, Panxian County, Guizhou Province, revealed a conodont sequence including four Anisian conodont zones, viz. Nicoraella germanica Zone, Nc. kockeli Zon...Detailed conodont analysis on the Yangjuan-Chupiwa section, Xinmin, Panxian County, Guizhou Province, revealed a conodont sequence including four Anisian conodont zones, viz. Nicoraella germanica Zone, Nc. kockeli Zone, Paragondolella bifurcata Zone and Neogondolella constricta Zone. These zones indicate that the upper Guanling Formation consists of strata from the Bithynian to the lllyrian of the Anisian. Appearance of Neogondolella constricta suggests that the Anisian/Ladinian boundary might be in the overlying Yangliujing Formation. The Panxian Fauna with well-preserved marine reptile and fish fossils is proved to belong to the lower part of the conodont Nc. kockeli Zone in the studied area. Thus, the age of the Panxian Fauna could be the early Pelsonian of the Anisian.展开更多
This paper systematically investigated the conodonts from the uppermost Permian to the Lower Triassic at the Dongpan Section, Southern Guangxi, South China, and obtained abundant Late Permian conodonts from the syndep...This paper systematically investigated the conodonts from the uppermost Permian to the Lower Triassic at the Dongpan Section, Southern Guangxi, South China, and obtained abundant Late Permian conodonts from the syndepositional limestone lenses of beds 3 and 5-2 at this section. One genus and eight species of conodont P1 element including one new species, Neogondolella dongpanensis sp. nov., have been identified. The feature of conodont fauna indicates that conodonts collected from beds 3 and 5 at the Dongpan Section belong to the Neogondolella yini conodont zone, and correspond to bed 24 at the Meishan Section. Based on these conodont data, we suggest that the Neoalbaillella optima radiolarian zone at the Dongpan Section at least extended to the upper part of the N. yini conodont zone.展开更多
The Angjie Formation and Xiala Formation,present in the Shiquanhe area of Gar County in the western part of Gangdise,Tibet,belong to the Gangdise stratigraphic subregion. Conodonts have been found in the Angjie Format...The Angjie Formation and Xiala Formation,present in the Shiquanhe area of Gar County in the western part of Gangdise,Tibet,belong to the Gangdise stratigraphic subregion. Conodonts have been found in the Angjie Formation,and they permit an age determination of Early to Middle Permian for that formation. The age of the Xiala Formation could be late Middle Permian. Whether the Late Permian marine deposits are present in this area still needs to be determined,but it is possible that the lower part of the Xiala Formation overlaps partly the upper part of the Angjie Formation. More importantly,the study has brought about a finding of typical peri-Gondwana cool water facies conodonts,namely,Vjalovognathus sp. nov. x. This is the first report and brief description of a conodont fauna from peri-Gondowana cool water facies in China. It indicates that the Gangdise stratigraphic subregion can be subdivided;the western part belongs to peri-Gondwana cool water facies,and the eastern part belongs to Tethys.展开更多
本文描述了采自贵州省六枝县郎岱剖面“法郎组”的一些牙形石。该牙形石群主要由Paragondolella polygnathiformis, P. maantangensis, P. tadpole, P. navicula navicula, P. foliata foliata, P. foliatainclinata, P. jiangyouensis,...本文描述了采自贵州省六枝县郎岱剖面“法郎组”的一些牙形石。该牙形石群主要由Paragondolella polygnathiformis, P. maantangensis, P. tadpole, P. navicula navicula, P. foliata foliata, P. foliatainclinata, P. jiangyouensis, P. langdaiensis Yang sp. nov.等组成,自下而上可识别出3个牙形石带:竹杆坡组Paragondolella polygnathiformis-Paragondolella maantangensis组合带、Paragondolella polygnathiformis-Paragondolella tad pole组合带、瓦窑组Paragondolella polygnathiformis带。因此,该剖面“法郎组”的时代,不仅上部(当前的瓦窑组),而且下部(当前的竹杆坡组),都是晚三叠世卡尼期的。展开更多
基金This study was financially supported by grants from the"985"project of Peking University,National Natural Science Foundation of China(grant 40272005)the Major Basic Research Projects of China(grant G2000077700).
文摘Detailed conodont analysis on the Yangjuan-Chupiwa section, Xinmin, Panxian County, Guizhou Province, revealed a conodont sequence including four Anisian conodont zones, viz. Nicoraella germanica Zone, Nc. kockeli Zone, Paragondolella bifurcata Zone and Neogondolella constricta Zone. These zones indicate that the upper Guanling Formation consists of strata from the Bithynian to the lllyrian of the Anisian. Appearance of Neogondolella constricta suggests that the Anisian/Ladinian boundary might be in the overlying Yangliujing Formation. The Panxian Fauna with well-preserved marine reptile and fish fossils is proved to belong to the lower part of the conodont Nc. kockeli Zone in the studied area. Thus, the age of the Panxian Fauna could be the early Pelsonian of the Anisian.
基金National Natural Science Foundation of China (Grant Nos. 40621002 and 40232025)the MOE Innovative Research Team Program (Grant No. IRT0546)+1 种基金the "111" Project (Grant No. B08030)the China Petroleum and Chemical Corporation (Grant No. G0800-06-ZS-319)
文摘This paper systematically investigated the conodonts from the uppermost Permian to the Lower Triassic at the Dongpan Section, Southern Guangxi, South China, and obtained abundant Late Permian conodonts from the syndepositional limestone lenses of beds 3 and 5-2 at this section. One genus and eight species of conodont P1 element including one new species, Neogondolella dongpanensis sp. nov., have been identified. The feature of conodont fauna indicates that conodonts collected from beds 3 and 5 at the Dongpan Section belong to the Neogondolella yini conodont zone, and correspond to bed 24 at the Meishan Section. Based on these conodont data, we suggest that the Neoalbaillella optima radiolarian zone at the Dongpan Section at least extended to the upper part of the N. yini conodont zone.
基金Supported by the Chinese National Key Project for Basic Research (Grant No. 2002CB412610)the National Natural Science Foundation of China (Grant Nos. 40542008 and 40672012) Chinese Geological Survey Project (Grant No. 200213000009)
文摘The Angjie Formation and Xiala Formation,present in the Shiquanhe area of Gar County in the western part of Gangdise,Tibet,belong to the Gangdise stratigraphic subregion. Conodonts have been found in the Angjie Formation,and they permit an age determination of Early to Middle Permian for that formation. The age of the Xiala Formation could be late Middle Permian. Whether the Late Permian marine deposits are present in this area still needs to be determined,but it is possible that the lower part of the Xiala Formation overlaps partly the upper part of the Angjie Formation. More importantly,the study has brought about a finding of typical peri-Gondwana cool water facies conodonts,namely,Vjalovognathus sp. nov. x. This is the first report and brief description of a conodont fauna from peri-Gondowana cool water facies in China. It indicates that the Gangdise stratigraphic subregion can be subdivided;the western part belongs to peri-Gondwana cool water facies,and the eastern part belongs to Tethys.
文摘本文描述了采自贵州省六枝县郎岱剖面“法郎组”的一些牙形石。该牙形石群主要由Paragondolella polygnathiformis, P. maantangensis, P. tadpole, P. navicula navicula, P. foliata foliata, P. foliatainclinata, P. jiangyouensis, P. langdaiensis Yang sp. nov.等组成,自下而上可识别出3个牙形石带:竹杆坡组Paragondolella polygnathiformis-Paragondolella maantangensis组合带、Paragondolella polygnathiformis-Paragondolella tad pole组合带、瓦窑组Paragondolella polygnathiformis带。因此,该剖面“法郎组”的时代,不仅上部(当前的瓦窑组),而且下部(当前的竹杆坡组),都是晚三叠世卡尼期的。
