Guzhangian

Guzhangian
Guzhangian
Chronology
←	Orsten Fauna
←	Burgess Shale
←	Kaili biota
←	Archaeocyatha extinction
←	Emu Bay Shale
←	Sirius Passet biota
←	Chengjiang biota
←	First Trilobites
←	SSF diversification, first brachiopods & archaeocyatha
←	First halkieriids, mollusсs, hyoliths SSF
←	Baykonurian glaciation
←	Dresbachian extinction
	Major Glacial period
	Subdivision of the Cambrian according to the ICS, as of 2022. ; Vertical axis scale: millions of years ago
Etymology
Name formality	Formal
Name ratified	2008
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
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
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

28°43′12″N 109°57′53″E / 28.7200°N 109.9647°E / 28.7200; 109.9647 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.

^ "Chart/Time Scale". stratigraphy.org. International Commission on Stratigraphy.
^ ^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.