Earth:Drumian
The Drumian is a stage of the Miaolingian Series of the Cambrian. It succeeds the Wuliuan and precedes the Guzhangian. The base is defined as the first appearance of the trilobite Ptychagnostus atavus around 504.5 million years ago. The top is defined as the first appearance of another trilobite Lejopyge laevigata around 500.5 million years ago.
GSSP
The GSSP is defined in the Drumian section ( [ ⚑ ] 39°30′42″N 112°59′29″W / 39.5117°N 112.9915°W) in the Drum Mountains, Millard County, Utah, United States.[1] The stage was also named after the Drum Mountains. The section is an outcrop of the Wheeler Formation, a succession of calcareous shales. The precise base of the Drumian is a laminated limestone 62 m (203 ft) above the base of the Wheeler Formation.[2]
Major events
The Cambrian Drumian carbon isotope excursion (DICE) event is associated with the beginning of this age.[3] The cause of this event was the shallowing of anoxic deep waters simultaneously with their transgression. DICE hampered the recovery of reef ecosystems already affected by the early–middle Cambrian mass extinctions.[4] In the middle–late Drumian, there was a radiation interval, before the next extinction event.[5]
Paleontology
Numerous sponges, palaeoscolecids and euarthropods (including radiodonts) are known from the Drumian deposits.[6][7][8]
References
- ↑ Cite error: Invalid
<ref>tag; no text was provided for refs namedbabcock2007 - ↑ "GSSP for Drumian Stage". https://timescalefoundation.org/gssp/detail.php?periodid=149&top_parentid=77.
- ↑ Anaïs Pagès, Susanne Schmid (2016). "Euxinia linked to the Cambrian Drumian carbon isotope excursion (DICE) in Australia: Geochemical and chemostratigraphic evidence". Palaeogeography, Palaeoclimatology, Palaeoecology 461: 65-76. doi:10.1016/j.palaeo.2016.08.008. Bibcode: 2016PPP...461...65P. https://www.researchgate.net/publication/305929589.
- ↑ Dandan Li, Xu Zhang, Shan-Chi Peng, Yanan Shen, Xiaolin Zhang, Hao Zhu, Lilin Sun (2019). "A paired carbonate–organic δ13C approach to understanding the Cambrian Drumian carbon isotope excursion (DICE)". Precambrian Research 349. doi:10.1016/j.precamres.2019.105503. https://www.researchgate.net/publication/336707009.
- ↑ 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). doi:10.1016/j.palaeo.2023.111492. Bibcode: 2023PPP...61811492D. https://www.researchgate.net/publication/369096101.
- ↑ Lucas Del Mouro, Joseph Botting, Jacob Skabelund, Rudy Lerosey-Aubril, Robert R. Gaines, Javier Ortega-Hernández (2022). "Revision of the middle Cambrian (Drumian) sponges from the Marjum Formation of Utah, USA". Conference: 6th International Palaeontological Congress, Khon Kaen, Thailand. https://www.researchgate.net/publication/365394008.
- ↑ Stephen Pates, Samuel Zamora (2023). "Large euarthropod carapaces from a high latitude Cambrian (Drumian) deposit in Spain". Royal Society Open Science 10 (10). doi:10.1098/rsos.230935. PMID 37885986. PMC 10598445. Bibcode: 2023RSOS...1030935P. https://www.researchgate.net/publication/374948138.
- ↑ Stephen Pates, Carlo Kier, Rudy Lerosey-Aubril, Allison C. Daley, Enrico Bonino (2019). "New radiodonts from the Drumian (Miaolingian) Marjum Formation of Utah, USA". Paleobios 36 (1): 116. https://www.researchgate.net/publication/332656191.
External links
- "Drumian Stage GSSP in the Stratotype Ridge section, Drum Mountains, Utah, USA". https://timescalefoundation.org/gssp/image.php?periodid=149&top_parentid=77&imageid=377.
- "GSSP Table - Paleozoic Era". https://timescalefoundation.org/gssp/index.php?parentid=77.
- "GSSPs - The Cambrian System 2019". International Commission on Stratigraphy. http://www.palaeontology.geo.uu.se/ISCS/ISCS_GSSPs.html.
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