Jiangshanian
28°48′57″N 118°36′54″E / 28.815967°N 118.614933°E
| Jiangshanian | ||||||||||||||||||||||||||||||||||||||
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| Chronology | ||||||||||||||||||||||||||||||||||||||
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| Etymology | ||||||||||||||||||||||||||||||||||||||
| Name formality | Formal | |||||||||||||||||||||||||||||||||||||
| Name ratified | 2011[2] | |||||||||||||||||||||||||||||||||||||
| Former name(s) | Cambrian Stage 9 | |||||||||||||||||||||||||||||||||||||
| Usage information | ||||||||||||||||||||||||||||||||||||||
| Celestial body | Earth | |||||||||||||||||||||||||||||||||||||
| Regional usage | Global (ICS) | |||||||||||||||||||||||||||||||||||||
| Time scale(s) used | ICS Time Scale | |||||||||||||||||||||||||||||||||||||
| Definition | ||||||||||||||||||||||||||||||||||||||
| Chronological unit | Age | |||||||||||||||||||||||||||||||||||||
| Stratigraphic unit | Stage | |||||||||||||||||||||||||||||||||||||
| Time span formality | Formal | |||||||||||||||||||||||||||||||||||||
| Lower boundary definition | FAD of the Trilobite Agnostotes orientalis | |||||||||||||||||||||||||||||||||||||
| Lower boundary GSSP | Duibian B Section, Duibian, Zhejiang, China 28°48′57″N 118°36′54″E / 28.815967°N 118.614933°E | |||||||||||||||||||||||||||||||||||||
| Lower GSSP ratified | 2011[2] | |||||||||||||||||||||||||||||||||||||
| Upper boundary definition | Not formally defined | |||||||||||||||||||||||||||||||||||||
| Upper boundary definition candidates | FAD of the Trilobite Lotagnostus americanus | |||||||||||||||||||||||||||||||||||||
| Upper boundary GSSP candidate section(s) | Duibian, Zhejiang, China | |||||||||||||||||||||||||||||||||||||
The Jiangshanian is the middle stage of the Furongian series. It follows the Paibian Stage and is succeeded by the still unnamed Stage 10 of the Cambrian. The base is defined as the first appearance of the trilobite Agnostotes orientalis[3] which is estimated to be 494 million years ago. The Jiangshanian lasted until approximately 489.5 million years ago.[4]
The Cambrian stage was named after Jiangshan, a city in China's Zhejiang province.[2]
GSSP
The GSSP of the Jiangshanian is the "Duibian B Section" (28°48′57″N 118°36′54″E / 28.815967°N 118.614933°E), west of the village of Duibian (碓边), and 10 km north of Jiangshan. The outcrop belongs to the Huayansi Formation (华严寺组).[3]
Major events
At the beginning of the Jiangshanian, there was a peak in species diversity, comparable to that observed in the middle Guzhangian, before the Guzhangian–Paibian extinction. Jiangshanian extinction, which lasted approximately from 493.9 to 491.3 Ma, reduced species diversity by 55.2%. It was followed by an interval of relatively small fluctuations in species richness, which ended shortly after the beggining of the Ordovician.[5]
Paleontology
Nearly 50 fossil genera were found in the Jiangshanian deposits of the Sandu Formation in Guangxi, South China. Organisms presented by the algae, graptolites, the cnidarian Sphenothallus, one species of Palaeoscolecida, and arthropods, which include aglaspidid, mollisoniid, and "bivalved" forms.[6] Rare hurdiids were discovered in the Jiangshanian strata in Sandu Formation and Wiśniówka Sandstone Formation in Poland.[6][7] Trilobites Parabolina, Hedinaspis, Eugonocare and Cermatops, with agnostoid genera including Pseudagnostus and Rhaptagnostus, were collected from the Jiangshanian sediments of western Tasmania.[8] Trilobite genera Monocheilus, Ptychaspis and Wilbernia are known from the Jiangshanian Honey Creek Formation in the Wichita Mountains, Oklahoma, USA.[9]
References
- ^ "Chart/Time Scale". stratigraphy.org. International Commission on Stratigraphy.
- ^ a b c Peng, Shanchi; Babcock, Loren; Zuo, Jingxun; Lin, Huanling; Yang, Xianfeng; Qi, Yuping; Bagnoli, Gabriella; Wang, Longwu (December 2012). "Global Standard Stratotype-Section and Point (GSSP) for the Base of the Jiangshanian Stage (Cambrian: Furongian) at Duibian, Jiangshan, Zhejiang, Southeast China" (PDF). Episodes. 35 (4): 462–477. doi:10.18814/epiiugs/2012/v35i4/002. Archived (PDF) from the original on 2024-04-04. Retrieved 2024-04-06.
- ^ a b "GSSP for Jiangshanian". Archived from the original on 2023-01-24. Retrieved 2024-04-06.
- ^ "Latest version of international chronostratigraphic chart". International Commission on Stratigraphy. Retrieved 2024-04-06.
- ^ Yiying Deng, Junxuan Fan, Shengchao Yang, Yukun Shi, Zhengbo Lu, Huiqing Xu, Zongyuan Sun, Fangqi Zhao, Zhangshuai Hou (2023). "No Furongian Biodiversity Gap: Evidence from South China". Palaeogeography, Palaeoclimatology, Palaeoecology. 618 (1): 111492. doi:10.1016/j.palaeo.2023.111492.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ a b Xuejian Zhu, Rudy Lerosey-Aubril, Javier Ortega-Hernández (2021). "Furongian (Jiangshanian) occurrences of radiodonts in Poland and South China and the fossil record of the Hurdiidae". PeerJ. 9 (e11800): 1—23. doi:10.7717/peerj.11800.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Gaëtan J-M Potin, Allison C. Daley (2023). "The significance of Anomalocaris and other Radiodonta for understanding paleoecology and evolution during the Cambrian explosion". Frontiers in Earth Science. 11: 1—26. doi:10.3389/feart.2023.1160285.
- ^ Christopher J. Bentley, James B. Jago, Keith Corbett (2020). "Late Cambrian (Iverian, Jiangshanian) fossils from the Professor Range area, Western Tasmania". Alcheringa: An Australasian Journal of Palaeontology. 44 (2): 1—14. doi:10.1080/03115518.2020.1725833.
{{cite journal}}: CS1 maint: multiple names: authors list (link) - ^ Sean R. Blackwell, Stephen R. Westrop (2023). "A new Cambrian (Jiangshanian, Sunwaptan) trilobite fauna from Oklahoma and its biostratigraphic significance". Journal of Paleontology. 97 (4): 1—26. doi:10.1017/jpa.2023.40.
External links
- "GSSP of the Jiangshanian Stage in the Duibian B section, Zhejiang, China". timescalefoundation.org. Archived from the original on 2022-05-26.
- "GSSP Table - Paleozoic Era". Archived from the original on 2023-10-08.
- "GSSPs - The Cambrian System 2019". International Commission on Stratigraphy. Archived from the original on 2023-07-21.
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