Drumian

Drumian
Drumian
~504.5 – ~500.5 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
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 2023.; Vertical axis scale: Millions of years ago;
Etymology
Name formality	Formal
Name ratified	2006
Former name(s)	Cambrian Stage 6
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	Babcock et. al, 2006
Time span formality	Formal
Lower boundary definition	FAD of the Trilobite Ptychagnostus atavus
Lower boundary GSSP	Drumian section, Wheeler Shale, Utah, U.S.A.; 39°30′42″N 112°59′29″W / 39.5117°N 112.9915°W
Lower GSSP ratified	2006
Upper boundary definition	FAD of the Trilobite Lejopyge laevigata
Upper boundary GSSP	Luoyixi section, Luoyixi, Guzhang, Hunan, China; 28°43′12″N 109°57′53″E / 28.7200°N 109.9647°E
Upper GSSP ratified	2008

39°30′42″N 112°59′29″W / 39.5117°N 112.9915°W / 39.5117; -112.9915 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.

The GSSP is defined in the Drumian section (39°30′42″N 112°59′29″W / 39.5117°N 112.9915°W / 39.5117; -112.9915) in the Drum Mountains, Millard County, Utah, United States.^[5] 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.^[6]

Palaeontology

Chancelloria

Arthropods

Arthropods of the Drumian
Taxa	Presence	Location	Description	Images
Leanchoilia	"Stage 3"-Guzhangian	Burgess Shale, British Columbia, Canada; Yuanshan Formation, Chengjiang biota, China
Sidneyia	"Stage 5"-Guzhangian	Phyllopod Bed, Burgess Shale

Dinocarididans

Dinocarididans of the Drumian
Taxa	Presence	Location	Description	Images
Anomalocaris	"Stage 3"-Drumian	Burgess Shale, Canada; China; Wheeler Shale, Utah & Pennsylvania, USA; and Emu Bay, Kangaroo Island, Australia
Opabinia	"Stage 5"-Guzhangian	Burgess Shale
Peytoia	Fortunian-Guzhangian	Phyllopod bed, Walcott Quarry, Burgess Shale, British Columbia, Canada; Koscierzyna borehole, Kashubia, Poland

References

^ "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. September 2023. Retrieved November 10, 2024.
^ ^a ^b Babcock, Loren; Robison, Richard; Rees, Margaret; Peng, Shanchi; Saltzman, Matthew (June 2007). "The Global boundary Stratotype Section and Point (GSSP) of the Drumian Stage (Cambrian) in the Drum Mountains, Utah, USA". Episodes. 30 (2): 85–89. doi:10.18814/epiiugs/2007/v30i2/003. Retrieved 13 December 2020.
^ Babcock, Loren; Robinson, Richard; Rees, Margaret; Shanchi, Peng; Saltzman, Matthew. "PROPOSED GLOBAL STANDARD STRATOTYPE-SECTION AND POINT FOR THE DRUMIAN STAGE (CAMBRIAN)". International Subcommission on Cretaceous Stratigraphy. International Subcommission on Cambrian Stratigraphy. Retrieved 13 December 2020.
^ 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". Episodes. 32 (1): 41–55. doi:10.18814/epiiugs/2009/v32i1/006. Retrieved 13 December 2020.
^ Babcock, Loren E.; Richard A. Robison; Margaret N. Rees; Shanchi Peng; Matthew R. Saltzman (2007). "The Global boundary Stratotype Section and Point (GSSP) of the Drumian Stage (Cambrian) in the Drum Mountains, Utah, USA" (PDF). Episodes. 30 (2): 85–95. Retrieved 14 September 2012.^{[permanent dead link]}
^ "GSSP for Drumian Stage". Retrieved 12 November 2012.

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[1] "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. September 2023. Retrieved November 10, 2024.

[babcock2007-2] Babcock, Loren; Robison, Richard; Rees, Margaret; Peng, Shanchi; Saltzman, Matthew (June 2007). "The Global boundary Stratotype Section and Point (GSSP) of the Drumian Stage (Cambrian) in the Drum Mountains, Utah, USA". Episodes. 30 (2): 85–89. doi:10.18814/epiiugs/2007/v30i2/003. Retrieved 13 December 2020.

[3] Babcock, Loren; Robinson, Richard; Rees, Margaret; Shanchi, Peng; Saltzman, Matthew. "PROPOSED GLOBAL STANDARD STRATOTYPE-SECTION AND POINT FOR THE DRUMIAN STAGE (CAMBRIAN)". International Subcommission on Cretaceous Stratigraphy. International Subcommission on Cambrian Stratigraphy. Retrieved 13 December 2020.

[4] 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". Episodes. 32 (1): 41–55. doi:10.18814/epiiugs/2009/v32i1/006. Retrieved 13 December 2020.

[Babcock_2007-5] Babcock, Loren E.; Richard A. Robison; Margaret N. Rees; Shanchi Peng; Matthew R. Saltzman (2007). "The Global boundary Stratotype Section and Point (GSSP) of the Drumian Stage (Cambrian) in the Drum Mountains, Utah, USA" (PDF). Episodes. 30 (2): 85–95. Retrieved 14 September 2012.^{[permanent dead link]}

[GSSP_for_Drumian_Stage-6] "GSSP for Drumian Stage". Retrieved 12 November 2012.

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