Carboniferous conodont biostratigraphy of the Dianzishang section, Zhenning, Guizhou, South China

Abstract

A preliminary summary of the lower Visean to uppermost Moscovian (Carboniferous) conodont succession and biostratigraphy of the Dianzishang section in Zhenning, Guizhou, South China is presented. Eleven conodont zones, in ascending order, can be recognized: Gnathodus praebilineatus, Gnathodus bilineatus, Lochriea ziegleri, Declinognathodus noduliferus, Neognathodus symmetricus, 'Streptognathodus' expansus (primitive form), 'Streptognathodus' expansus, Mesogondolella donbassica -Mesogondolella clarki, Idiognathodus podolskensis, Swadelina fauna and Idiognathodus swadei zones. The first occurrences of Lochriea ziegleri at the base of the Serpukhovian Stage, Declinognathodus noduliferus noduliferus at the base of the Bashkirian Stage and 'Streptognathodus' expansus at the base of the Moscovian Stage are recognized. The definitions of these stage boundaries, as well as that of the base of the Kasimovian Stage are discussed. Correlations with the Naqing section in South China, Russian and North American sections, as well as other important sections in the world, are considered.

Pennsylvanian–earlyPermianpalaeokarst development on theYangtzePlatform,South China, and implications for the regional sea‐level history

“…, ), Dianzishang (Qi et al . , ), Dushan (Wang, ), Zongdi (late Moscovian to Asselian, Ueno et al, ), and Madiyi sections. The stratigraphic correlation is based on late Bashkirian to Asselian conodont and fusulinid biostratigraphy [Colour figure can be viewed at wileyonlinelibrary.com]…”

“…The initial transgression observed at Madiyi is only the terminal part of the large Bashkirian transgression that started in the early‐middle Bashkirian and is well documented in South China (Qin, Zeng, Huang, & Wu, ). During the late Bashkirian to earliest Moscovian ( Profusulinella Zone), the sea‐level remained generally high and relatively stable, but short‐term fluctuations, as inferred from facies changes in slope facies (Dianzishang (DZS); Qi, Hu, Wang, & Lin, ) and shallow water platform facies (Dushan (DS); Wang, ), were superimposed. The sea‐level fall in the latest Bashkirian and the subsequent extensive relative lowstand are well known in the basinal facies of south Guizhou and north Guangxi (Li, Liu, & Zhao, ) and are documented in the karstic surface in the shallow water facies of Majiaoba, Sichuan (Qin et al .…”

“…The shallowing‐upward cycles present in basinal and slope sections (MY: Qie & Wang, ; DZS: Qi et al . , ) and other types of cycles (see ) are most often characterized by subaerial exposure surfaces and palaeokarst development at the cycle tops in shallow settings (e.g., DS: vugs or small crystal caves and palaeosols; Wang, ). In the middle Yangtze area, several depositional hiatuses are reported in the Huanglong Formation (Liang, Wang, & Zhu, ) and may correspond to the numerous palaeokarst horizons in the Madiyi and Zongdi sections.…”

“…MDY = Madiyi section; ZD = Zongdi section (Ueno et al . , ); DS = Dushan section (Wang, ); DZS = Dianzishang section (Qi et al, ); BP = Bianping section (Yan et al, ); MY = Meyao section (Qie & Wang, ); UY = Upper Yangtze land; LY = Lower Yangtze land; Ca = Cathaysia land; XF = Xuefeng Uplift; JN = Jiangnan land [Colour figure can be viewed at wileyonlinelibrary.com]…”

Determination of the Bashkirian–Moscovian boundary in the Volga region via conodont speciesDeclinognathodus donetzianusNemirovskaya

“…During biostratigraphic analysis of conodonts, most of the focus was on the exact species since this is a candidate for the role of biomarker of the Bashkirian-Moscovian boundary: Declinognathodus donetzianus Nemirovskaya; Diplognathodus ellesmerensis Bender; Idiognathoides postsulcatus Nemirovskaya (Yuping et al 2010); and Streptognathodus expansus (Igo & Koike) (Qi et al 2013). Brief lithological characteristics of the open-pit mines and composition of the conodont complexes is given in Table 1 (Figs 3-10).…”