Drumian

Cambrian graphical timeline

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Burgess Shale

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Kaili biota

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Archaeocyatha extinction

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Sirius Passet biota

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Chengjiang biota

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Baykonurian glaciation

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Dresbachian extinction

Major Glacial period

Subdivision of the Cambrian according to the ICS, as of 2023.^[1]
Vertical axis scale: Millions of years ago

39°30′42″N 112°59′29″W / 39.5117°N 112.9915°W / 39.5117; -112.9915 The Drumian is a stage of 3rd series of the Cambrian. It succeeds still unnamed 5th stage of the Cambrian 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.^[2] 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.^[3]

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.
^ 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.
^ "GSSP for Drumian Stage". Retrieved 12 November 2012.

Preceded by the Proterozoic Eon	Phanerozoic Eon
	Paleozoic Era						Mesozoic Era			Cenozoic Era
	Cambrian	Ordovician	Silurian	Devonian	Carboniferous	Permian	Triassic	Jurassic	Cretaceous	Paleogene	Neogene	4ry

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

[Babcock_2007-2] 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.

[GSSP_for_Drumian_Stage-3] "GSSP for Drumian Stage". Retrieved 12 November 2012.

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