Exposed in natural outcrops near the Duibian Village, Jiangshan County, Zhejiang Province, China, the Duibian B section is proposed as the boundary stratotype for the base of an unnamed stage termed provisionally Camb...Exposed in natural outcrops near the Duibian Village, Jiangshan County, Zhejiang Province, China, the Duibian B section is proposed as the boundary stratotype for the base of an unnamed stage termed provisionally Cambrian Stage 9. The proposed position of the GSSP is 108.12 m above the base of the Huayansi Formation, at a horizon coinciding with the first appearance of the cosmopolitan agnostoid trilobite Agnostotes orientalis. This horizon coincides also with the first appearance of the cosmopoli-tan polymerid trilobite Irvingella angustilimbata. The section fulfills all the requirements for a GSSP, and the horizon can be constrained not only by the primary stratigraphic marker (A. orientalis) but also with secondary biostratigraphic, chemostratigraphic, and sequence-stratigraphic correlation tools. The first appearance of A. orientalis is one of the most readily recognizable levels in Cambrian, and can be correlated with precision to all paleocontinents.展开更多
The International Commission on Stratigraphy and the IUGS Executive Committee have recently approved a Global Standard Stratotype-section and Point(GSSP)defining the base of the second stage of the Furongian Series,Ca...The International Commission on Stratigraphy and the IUGS Executive Committee have recently approved a Global Standard Stratotype-section and Point(GSSP)defining the base of the second stage of the Furongian Series,Cambrian System.This stage is named the Jiangshanian Stage,after Jiangshan City,western Zhejiang Province,China,where the GSSP is located.The GSSP is exposed in a natural outcrop near Duibian Village.It is defined at the base of a limestone(wackestone)layer 108.12 m above the base of the Huayansi Formation in the Duibian B section,coinciding with the first appearance of the cosmopolitan agnostoid trilobite Agnostotes orientalis(base of the A.orientalis Zone).The GSSP is at a position of 28°48.977´N latitude and 118º36.887´E longitude.Secondary global markers at or near the base of the stage include the first appearance of the cosmopolitan polymerid trilobite Irvingella angustilimbata,which coincides with the FAD of the primary marker in the stratotype section,and near the end of a large positive carbon isotopic excursion(SPICE excursion).Faunal turnovers close to the base of the Jiangshanian Stage have been recognized as being at the base of the Iverian Stage in Australia,the Gonggrian Stage in Korea,and the Agnostotes orientalis–Irvingella perfecta Zone in Siberia,and near the base of the Aksayan Stage in Kazakhstan,the Sunwaptan Stage in Laurentia,and the Parabolina brevispina Zone in Baltica.展开更多
基金Supported by Chinese Academy of Sciences (Grant No. KZCX2-YW-122)the Ministry of Science and Technology of China (Grant Nos. 2006FY120300, 2006CB806400)+1 种基金National Natural Science Foundation of China (Grant Nos.40072003,40023002,40332018,40672023,40602002)the U.S. National Science Foundation (Grant No. EAR-0106883)
文摘Exposed in natural outcrops near the Duibian Village, Jiangshan County, Zhejiang Province, China, the Duibian B section is proposed as the boundary stratotype for the base of an unnamed stage termed provisionally Cambrian Stage 9. The proposed position of the GSSP is 108.12 m above the base of the Huayansi Formation, at a horizon coinciding with the first appearance of the cosmopolitan agnostoid trilobite Agnostotes orientalis. This horizon coincides also with the first appearance of the cosmopoli-tan polymerid trilobite Irvingella angustilimbata. The section fulfills all the requirements for a GSSP, and the horizon can be constrained not only by the primary stratigraphic marker (A. orientalis) but also with secondary biostratigraphic, chemostratigraphic, and sequence-stratigraphic correlation tools. The first appearance of A. orientalis is one of the most readily recognizable levels in Cambrian, and can be correlated with precision to all paleocontinents.
基金supported in part by grants from the State Key Laboratory on Palaeobiology and Stratigraphy,(2009110320121101)+2 种基金the Ministry of Science and Technology of China(2006FY120300)the National Natural Science Foundation of China(41290260,41221001)the National Commission on Stratigraphy of China to Peng.
文摘The International Commission on Stratigraphy and the IUGS Executive Committee have recently approved a Global Standard Stratotype-section and Point(GSSP)defining the base of the second stage of the Furongian Series,Cambrian System.This stage is named the Jiangshanian Stage,after Jiangshan City,western Zhejiang Province,China,where the GSSP is located.The GSSP is exposed in a natural outcrop near Duibian Village.It is defined at the base of a limestone(wackestone)layer 108.12 m above the base of the Huayansi Formation in the Duibian B section,coinciding with the first appearance of the cosmopolitan agnostoid trilobite Agnostotes orientalis(base of the A.orientalis Zone).The GSSP is at a position of 28°48.977´N latitude and 118º36.887´E longitude.Secondary global markers at or near the base of the stage include the first appearance of the cosmopolitan polymerid trilobite Irvingella angustilimbata,which coincides with the FAD of the primary marker in the stratotype section,and near the end of a large positive carbon isotopic excursion(SPICE excursion).Faunal turnovers close to the base of the Jiangshanian Stage have been recognized as being at the base of the Iverian Stage in Australia,the Gonggrian Stage in Korea,and the Agnostotes orientalis–Irvingella perfecta Zone in Siberia,and near the base of the Aksayan Stage in Kazakhstan,the Sunwaptan Stage in Laurentia,and the Parabolina brevispina Zone in Baltica.
