“Drumian”的意思、由来-开放百科全书

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Drumian

释义

Palaeontology
Arthropods Dinocarididans
References

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 {{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.^[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 {{convert|62|m|abbr=on}} above the base of the Wheeler Formation.^[2]

Palaeontology

Chancelloria

Arthropods

Leanchoilia

Sidneyia

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

Dinocarididans

Anomalocaris

Opabinia

Peytoia

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

References

1. ^{{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}}{{dead link|date=September 2017 |bot=InternetArchiveBot |fix-attempted=yes }}
2. ^{{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}}

4 : Cambrian geochronology|Geological ages|Cambrian United States|Drumian

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