Drumian: Difference between revisions

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]

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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 {{Cambrian graphical timeline}}
 {{Coord|39.5117|N|112.9915|W|display=title}}
-The '''Drumian ''' is a stage of [[Cambrian Series 3|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 {{Geologic Ages Inline|Drumian}} million years ago. The top is defined as the first appearance of another trilobite ''[[Lejopyge laevigata]]'' around {{Geologic Ages Inline|Guzhangian}} million years ago.
+The '''Drumian ''' is a stage of [[Cambrian Series 3|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 {{Period start|Drumian}} million years ago. The top is defined as the first appearance of another trilobite ''[[Lejopyge laevigata]]'' around {{Period start|Guzhangian}} million years ago.
 The [[GSSP]] is defined in the '''Drumian section''' ({{Coord|39.5117|N|112.9915|W|display=inline}}) in the [[Drum Mountains]], [[Millard County]], [[Utah]], United States.<ref name="Babcock 2007">{{cite journal|last=Babcock|first=Loren E.|authorlink=Loren E. Babcock|author2=Richard A. Robison |author3=Margaret N. Rees |author4=Shanchi Peng |author5=Matthew R. Saltzman |title=The Global boundary Stratotype Section and Point (GSSP) of the Drumian Stage (Cambrian) in the Drum Mountains, Utah, USA|journal=Episodes|year=2007|volume=30|issue=2|pages=85–95|url=http://www.stratigraphy.org/GSSP/file45.pdf|accessdate=14 September 2012}}</ref> 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 {{convert|62|m|abbr=on}} above the base of the Wheeler Formation.<ref name="GSSP for Drumian Stage">{{cite web|title=GSSP for Drumian Stage|url=https://engineering.purdue.edu/Stratigraphy/gssp/detail.php?periodid=149&top_parentid=77|accessdate=12 November 2012}}</ref>