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Conodont faunas across the Kasimovian–Gzhelian boundary (Late Pennsylvanian) in South China and implications for the selection of the stratotype for the base of the global Gzhelian Stage
Author(s) -
Qi Yuping,
Barrick James E.,
Hogancamp Nicholas J.,
Chen Jitao,
Hu Keyi,
Wang Qiulai,
Wang Xiangdong
Publication year - 2020
Publication title -
papers in palaeontology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.827
H-Index - 15
ISSN - 2056-2802
DOI - 10.1002/spp2.1301
Subject(s) - global boundary stratotype section and point , conodont , pennsylvanian , paleontology , stratotype , geology , group (periodic table) , excursion , stage (stratigraphy) , taxon , fauna , magnetostratigraphy , biostratigraphy , ecology , biology , structural basin , chemistry , organic chemistry , political science , law
The upper Pennsylvanian Naqing and Narao carbonate successions were deposited in intra‐platform slope‐to‐basinal settings across the Kasimovian–Gzhelian boundary in Guizhou, South China. Conodont faunas consist of a mixture of the endemic taxa of the Idiognathodus luodianensis group and cosmopolitan species of the I. simulator group. The I. luodianensis group includes the new species I. fengtingensis , I. luodianensis , I. naqingensis and I. naraoensis . On platform landmark analysis the species of the I. luodianensis group differ in morphological features from co‐occurring species of the I. simulator group. Both groups display similar increasing asymmetry in P 1 element pairs across the Kasimovian–Gzhelian boundary, as recognized on the basis of the first occurrence of I. simulator . Many Kasimovian Idiognathodus species disappear and several Gzhelian species first appear with I. simulator , including two new species of Streptognathodus : S . nemyrovskae and S . zhihaoi . Just below the base of the Gzhelian, carbonate δ 13 C falls from 4‰ to 2‰ in both sections. The combination of an abrupt faunal turnover immediately above the prominent negative δ 13 C excursion might represent an oceanic event in South China, perhaps recognizable on a global scale. One of these two South China sections may be the best location to place the GSSP for the base of the Gzhelian Stage.