Jiangshanian
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 which is estimated to be 494 million years ago. The Jiangshanian lasted until approximately 489.5 million years ago.[2]
| Jiangshanian | |
|---|---|
| ~494 – ~489.5 Ma | |
| Chronology | |
Key events in the Cambrian -540 — – -535 — – -530 — – -525 — – -520 — – -515 — – -510 — – -505 — – -500 — – -495 — – -490 — – -485 — – Major Glacial period Stratigraphic scale of the ICS subdivisions and Precambrian/Cambrian boundary. | |
| Etymology | |
| Name formality | Formal |
| Name ratified | 2011[1] |
| 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 28.815967°N 118.614933°E |
| GSSP ratified | 2011[1] |
| 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 Cambrian stage was named after Jiangshan, a city in China's Zhejiang province.[3]
The GSSP of the Jiangshanian is the "Duibian B Section" (28.815967°N 118.614933°E), west of the village of Duibian, and 10 km north of Jiangshan. The outcrop belongs to the Huayansi Formation.[3]
References
- 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". Episodes. 35 (4): 462–477. doi:10.18814/epiiugs/2012/v35i4/002. Retrieved 13 December 2020.
- "International Chronostratigraphic Chart". ICS. Archived from the original on 30 October 2012. Retrieved 12 November 2012.
- "GSSP for Jiangshanian". Retrieved 12 November 2012.
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