Conodont biostratigraphy of the Nalai section (Guangxi) and new data on the age of the Zdimir beds in South China.

Abstract

The conodont biostratigraphy of the lower part of the Beiliu Formation at the Nalai, Guangxi is described. The association of Polygnathus serotinus, P. cooperi cooperi, P. cracens, P. linguiformis bultyncki and Bipennatus cf. B. montensis indicates that this stratigraphic interval, in which one Zdimir bed crops out, can be assigned to the serotinus Zone. Bipennatus cf. B. montensis, which closely resembles B. montensis from the Eifelian costatus Zone, is recorded from a relatively lower level in the Emsian serotinus Zone. The stratigraphic distribution of Zdimir in South China is further reviewed at seven sections where abundant specimens of Zdimir have been reported. Several Zdimir beds which were previously correlated with the patulus Zone are assigned to the serotinus Zone herein. The zonal correlation of these seven sections suggests that the Zdimir beds in South China belong to the serotinus Zone and to the partitus Zone. Sciences, East Beijing Road 39, 210008 Nanjing, PR China; jflu@nigpas.ac.cn, xqchen@nigpas.ac.cn • José Ignacio Valenzuela-Ríos & Jau-Chyn Liao, Department of Botany and Geology, University of Valencia, c/Dr. Moliner 50, E-46100 Burjassot, Spain; jose.i.valenzuela@uv.es, jau.liao@uv.es The genus Zdimir is represented by a group of large, thick-shelled and strong costate brachiopods that has been widely reported in the upper Emsian and the lower Eifelian

Morphogenetic patterns of the shelf-like protuberance in the late Emsian-early Eifelian polygnathid conodonts

“…However, the Beiliu Formation at the Tuotang section can be lithologically correlated with the same formation at the adjacent Nalai section, because both of them were deposited in similar environments and conformably overlie the Huangjingshan Formation which is mainly represented by thin‐ to thick‐bedded dolostone. According to Lu et al (), the lower part of the Beiliu Formation at the Nalai section was assigned to the serotinus Zone. Thus, it is plausible to assign the lower part of the Beiliu Formation at the Tuotang section covering an interval from the basal part of Bed 12 to the lower part of Bed 16 to the serotinus Zone, whereas precise conodont zonation of the overlying interval ranging from the middle part of Bed 16 to the uppermost part of Bed 17 is uncertain.…”

“…; 23° 36´9˝ N, 106°43´35˝ E). This section is located about 900 m northeast of the Liangtun Village (Baise, South China) and is approximately 5.5 km northwest of the Nalai section studied by Lu et al (). The upper part of the Huangjingshan Formation at the Tuotang section is marked by thin‐ to thick‐bedded (2–57 cm for a single bed) dolostone with badly preserved crinoid stems, tentaculitoids and brachiopods in Bed 10 (not illustrated here).…”

Life in the Palaeozoic: an overview of land and sea ecosystems

“…The works comprising this volume include, on one hand, those contributions of Colmenar et al (2017) and Pereira et al (2017) focused on the study of the Ordovician faunas (mainly brachiopods and trilobites) from Portugal, Spain, Czech Republic and Morroco; and secondly the contributions of Lu et al (2017), Chevrinais et al (2017) and Klug et al (2017), all of them focused on the Devonian Period including two main approaches, conodont biostratigraphy (Lu et al 2017), and palaeoecology (Chevrinais et al 2017, Klug et al 2017.…”

“…Finally, the Devonian contributions are completed with the manuscript of Lu et al (2017) focused on the study of the conodont fauna of the Nalai Section (Guangxi) in South China. The systematic and biostratigraphic work presented by the authors show a rich assemblage of conodonts with the presence of numerous species of the genera Polygnathus and Bipennatus, allowing, for the first time, the assignation to the serotinus Zone (Emsian, Lower Devonian) the Zdimir bed of the Beiliu Formation.…”