Guzhangian

Coordinates: 28°43′12″N 109°57′53″E / 28.7200°N 109.9647°E / 28.7200; 109.9647
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Guzhangian
~500.5 – ~497 Ma
↓
Chronology
←
←
Dresbachian extinction
Subdivision of the Cambrian according to the
Guzhang, Hunan, China
28°43′12″N 109°57′53″E / 28.7200°N 109.9647°E / 28.7200; 109.9647
Lower GSSP ratified2008[2]
Upper boundary definitionFAD of the Trilobite Glyptagnostus reticulatus
Upper boundary GSSPPaibi section, Paibi, Hunan, China
28°23′22″N 109°31′33″E / 28.3895°N 109.5257°E / 28.3895; 109.5257
Upper GSSP ratified2003[4]

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.

GSSP

The

Louyixi section (28°43′12″N 109°57′53″E / 28.7200°N 109.9647°E / 28.7200; 109.9647), where Lejopyge laevigata has its first appearance.[5]

Paleogeography

It is assumed that in the Guzhangian the distance between the Earth and the Moon was 370,180 ± 1220 km (today, for comparison, it is 384,000 km). The length of an earthly day at that time was about 21.58 hours.[6]

Major events

The species radiation occurred in the interval from the middle–late Drumian to middle Guzhangian. The extinction began in the middle of Guzhangian and lasted 3 million years until the middle of the Paibian age. As a result of this extinction, species diversity was reduced by 45%. Two phases of extinction can be traced in the sediments of South China: the first, with a slight decline in species, lasted about 1.8 million years; the second, with a sharper decline in richness, lasted 1.2 million years, more in the Paibian. After the extinction, species diversity returned to its previous level.[7] From the Guzhangian to Jiangshanian, the oceans experienced a gradual depletion of oxygen, which affected bottom-dwelling inhabitants. This process and the SPICE event, associated with it, likely became the cause of the extinction.[7]

References

  1. ^ "Chart/Time Scale". stratigraphy.org. International Commission on Stratigraphy.
  2. ^
    doi:10.18814/epiiugs/2009/v32i1/006. Archived
    (PDF) from the original on 2023-06-20. Retrieved 2024-04-04.
  3. ^ 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.
  4. ^
    doi:10.1080/00241160410002081. Archived
    (PDF) from the original on 2017-10-08. Retrieved 2024-04-04.
  5. ^ a b "GSSP for Guzhangian Stage". Archived from the original on 2023-01-24. Retrieved 2024-04-04.
  6. doi:10.1016/j.palaeo.2019.109530.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )
  7. ^
    doi:10.1016/j.palaeo.2023.111492.{{cite journal}}: CS1 maint: multiple names: authors list (link
    )

External links


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