Trilobites from the Silurian 'Lower Red Beds' of Wuhan, South China: stratigraphic and paleogeographic implications
Autor: | Jia-Yi Yin, Lie-Bin Huang, Yiming Gong, Yi-Long Liu, Rui-Wen Zong |
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Rok vydání: | 2022 |
Předmět: |
010506 paleontology
Red beds biology Stratigraphy Fauna Paleontology Diachronous 010502 geochemistry & geophysics biology.organism_classification 01 natural sciences Encrinuroides Trilobite Sedimentary depositional environment Index fossil Aulacopleura Ecology Evolution Behavior and Systematics Geology 0105 earth and related environmental sciences |
Zdroj: | Palaeoworld. 31:239-248 |
ISSN: | 1871-174X |
Popis: | The age of the Silurian “Lower Red Beds” (LRBs), which occur widely in South China, has long been controversial because of the scarcity of index fossils. Here, we report a fauna with abundant trilobites from the LRBs in Wuhan, Middle Yangtze region, consisting of Aulacopleura (Paraaulacopleura) pijiazhaiensis, ‘Encrinuroides’ yichangensis, Gaotania hubeiensis, Hyrokybe gaotanensis, Japonoscutellum yichangense, Latiproetus latilimbatus, and Ptilillaenus lojopingensis. These trilobites are common in the Leijiatun, upper Xiangshuyuan, Shihniulan, and Lojoping formations in the Upper Yangtze region, and belong to the middle to upper Aeronian Ptilillaenus or ‘Encrinuroides’–Ptilillaenus–Latiproetus assemblages. The discovery of this trilobite assemblage suggests that the LRBs are probably partly of middle–late Aeronian age in the Middle Yangtze region. Thus, the lower boundary of the LRBs is likely diachronous in the Yangtze region, ranging from the middle–late Aeronian to the early Telychian. The discovery of the Ptilillaenus assemblage in the Wuhan LRBs expands the paleogeographic distribution of this assemblage and provides evidence of deeper depositional environment of the LRBs in the study area versus shallow waters in other areas of the Yangtze region. |
Databáze: | OpenAIRE |
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