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Guzhangian
| Guzhangian | ||||||||||||||||||||||||||||||||||||||
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| Chronology | ||||||||||||||||||||||||||||||||||||||
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| Etymology | ||||||||||||||||||||||||||||||||||||||
| Name formality | Formal | |||||||||||||||||||||||||||||||||||||
| Name ratified | 2008[2] | |||||||||||||||||||||||||||||||||||||
| Former name(s) | Cambrian Stage 7 | |||||||||||||||||||||||||||||||||||||
| Usage information | ||||||||||||||||||||||||||||||||||||||
| Celestial body | Earth | |||||||||||||||||||||||||||||||||||||
| Regional usage | Global (ICS) | |||||||||||||||||||||||||||||||||||||
| Time scale(s) used | ICS Time Scale | |||||||||||||||||||||||||||||||||||||
| Definition | ||||||||||||||||||||||||||||||||||||||
| Chronological unit | Age | |||||||||||||||||||||||||||||||||||||
| Stratigraphic unit | Stage | |||||||||||||||||||||||||||||||||||||
| First proposed by | Shanchi et al., 2007[3] | |||||||||||||||||||||||||||||||||||||
| Time span formality | Formal | |||||||||||||||||||||||||||||||||||||
| Lower boundary definition | FAD of the Trilobite Lejopyge laevigata | |||||||||||||||||||||||||||||||||||||
| Lower boundary GSSP | Luoyixi section, Luoyixi, Guzhang, Hunan, China 28°43′12″N 109°57′53″E / 28.7200°N 109.9647°E | |||||||||||||||||||||||||||||||||||||
| Lower GSSP ratified | 2008[2] | |||||||||||||||||||||||||||||||||||||
| Upper boundary definition | FAD of the Trilobite Glyptagnostus reticulatus | |||||||||||||||||||||||||||||||||||||
| Upper boundary GSSP | Paibi section, Paibi, Hunan, China 28°23′22″N 109°31′33″E / 28.3895°N 109.5257°E | |||||||||||||||||||||||||||||||||||||
| Upper GSSP ratified | 2003[4] | |||||||||||||||||||||||||||||||||||||
28°43′12″N 109°57′53″E / 28.7200°N 109.9647°E The Guzhangian is an uppermost stage of the Miaolingian Series of the Cambrian. It follows the Drumian Stage and precedes the Paibian Stage of the Furongian Series. The base is defined as the first appearance of the trilobite Lejopyge laevigata around 500.5 million years ago.[5] The Guzhangian-Paibian boundary is marked by the first appearance of the trilobite Glyptagnostus reticulatus around 497 million years ago.[4]
The name Guzhangian is derived from Guzhang County, Hunan Province, China.
- ^ "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. September 2023. Retrieved December 16, 2024.
- ^ a b Peng, Shanchi; Babcock, Loren; Zuo, Jingxun; Lin, Huanling; Zhu, Xuejian; Yang, Xianfeng; Robison, Richard; Qi, Yuping; Bagnoli, Gabriella; Chen, Yong’an (March 2009). "The Global Boundary Stratotype Section and Point (GSSP) of the Guzhangian Stage (Cambrian) in the Wuling Mountains, Northwestern Hunan, China" (PDF). Episodes. 32 (1): 41–55. doi:10.18814/epiiugs/2009/v32i1/006. Archived (PDF) from the original on 2023-06-20. Retrieved 2024-04-04.
- ^ Shanchi, Peng; Babcock, Loren; Jingxun, Zuo; Huanling, Lin; Xuejian, Zhu; Xianfeng, Yang; Robison, Richard; Yuping, Qi; Bagnoli, Gabriella; Yong’an, Chen. "PROPOSED GLOBAL STANDARD STRATOTYPE-SECTION AND POINT FOR THE GUZHANGIAN STAGE (CAMBRIAN)" (PDF). International Subcommission on Cretaceous Stratigraphy. International Subcommission on Cambrian Stratigraphy. Archived (PDF) from the original on 2016-04-08. Retrieved 2024-04-04.
- ^ a b Peng, S. C.; Babcock, L. E.; Robison, R. A.; Lin, H. L.; Rees, M. N.; Saltzman, M. R. (2004). "Global Standard Stratotype-Section and Point (GSSP) of the Furongian Series and Paibian Stage (Cambrian)" (PDF). Lethaia. 37 (4): 365–379. Bibcode:2004Letha..37..365P. doi:10.1080/00241160410002081. Archived (PDF) from the original on 2017-10-08. Retrieved 2024-04-04.
- ^ "GSSP for Guzhangian Stage". Archived from the original on 2023-01-24. Retrieved 2024-04-04.
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