Citation: | YIN Jiayi, KOU Xiaohu, GUO Jungang, SONG Bowen, AI Chengzhi, HOU Yafei, WANG Jiaxuan, TANG Junyang. Upper Devonian conodonot and brachiopod biostratigraphic in Quanzhou area, Guangxi[J]. Geological Bulletin of China, 2019, 38(6): 930-949. |
The Devonian strata are developed in northeastern Guilin area, where there exist large quantities of fossils, which are of great significance for studying the Devonian biostratigraphy in southern China. The authors collected and studied conodonts and brachiopods from Changlongjie Formation, Xikuangshan Formation and Menggongao Formation in the Middle-Upper Devonian strata of the study area and obtained 104 pieces of conodonts and 34 brachiopod fossils. 20 species of 21 genus of conodonts as well as 9 species of 6 genus of conodonts were identified. According to the important conodonts fossils, 8 conodont zones were set up from the bottom to the top in the study area:Icriodus brecis Zone, Schmidtognathus hermanni-Polygnathus cristatus Zone, Schmidtognathus wittekindtii Zone, Palmatolepis linguiformis Zone, Palmatolepis triangularis Zone, Palmatolepis rhomboidea Zone, Icriodus cornutus Zone, Palmatolepis gracilis manca-Rhodalepis polylophodontiformis Zone, which indicates that Changlongjie Formation, Xikuangshan Formation and Menggongao Formation correspond to the upper part of Frasnian stage, the bottom part of Famennian stage and the middle and upper part of Famennian stage, respectively. In addition, the authors indicated Frasnian stageFamennian stage boundary in the study area according to the first appearance of Palmatolepis triangularis, 2 combinations were established in the study area:Cyrtospirifer Zone and the Yunnanella-Tenticosififer Zone, which correspond to Palmatolepis falsiovalis Zone, Palmatolepis linguiformis Zone, Palmatolepis marginifera.
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Late Devonian paleogeography map (a) and geological map and section location map (b) of the study area
The column of Dongshan section in Middle Devonian -Lower Carboniferous in Quanzhou area, Guangxi Province
The distribution of conodonts in Dongshan section from Quanzhou area, Guangxi Province
Correlation of Middle-Upper Devonian conodont zones in the study area and otherareas of southern China
The distribution of brachiopods in Dongshan section in Quanzhou area, Guangxi
Correlation of Middle-Upper Devonian brachiopod Zone zones in the study area and the other areas of southern China