The Global boundary Stratotype Section and Point (GSSP) of the Drumian Stage (Cambrian) in the Drum Mountains, Utah, USA

Babcock, Loren E.; Robison, Richard A.; Rees, Margaret N.; Shanchi, Peng; Saltzman, Matthew R.

doi:10.18814/epiiugs/2007/v30i2/003

Cited by 69 publications

(39 citation statements)

References 30 publications

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“…The age of the Ekspedition Brae Formation was discussed by Geyer & Peel (2017). Robison, R.A. (written communication 1987, cited by Peel & Streng 2015 dated the current samples to the Ptychagnostus atavus Biozone, the basal zone of the Drumian Stage (Cambrian Series 3, Stage 6), equivalent to the lower part of the Bolaspidella Biozone of the American standard (Babcock et al 2007).…”

Section: Methodsmentioning

confidence: 99%

An epiphytacean-Girvanella (Cyanobacteria) symbiosis from the Cambrian (Series 3, Drumian) of North Greenland (Laurentia)

Peel¹

2018

Bull. Geosci.

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The widespread Cambrian calcareous cyanobacterium Girvanella is described in symbiotic association with a new epiphytacean, Orpikania freucheni gen. et sp. nov. (Microproblematica), from the Ekspedition Brae Formation (Cambrian Series 3, Drumian Stage) of Freuchen Land, North Greenland. The phosphatized assemblages preserve dendrites of the epiphytacean forming a supporting framework for discrete climbing filaments of Girvanella lianiformis sp. nov. that are firmly attached to their host with holdfasts. Elevation of the slender Girvanella filaments on the framework of the dendrite potentially enhanced their phototactic movement towards the light. Filaments in the cooccurring Girvanella pituutaq sp. nov. are regularly twisted together into a ropelike form which may have assisted elevation above its substrate. •

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Section: Methodsmentioning

confidence: 99%

An epiphytacean-Girvanella (Cyanobacteria) symbiosis from the Cambrian (Series 3, Drumian) of North Greenland (Laurentia)

Peel¹

2018

Bull. Geosci.

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“…; Babcock et al . ). The ratified GSSPs for the Drumian, Guzhangian, Paibian and Jiangshanian stages (Fig.…”

Section: Cambrian Biostratigraphymentioning

confidence: 97%

“…The base of the Drumian Stage coincides with the First Appearance Datum (FAD) of Ptychagnostus atavus (also published as Acidusus atavus ; Babcock et al . ). The base of the Guzhangian Stage coincides with the FAD of Lejopyge laevigata (Peng et al .…”

Section: Cambrian Biostratigraphymentioning

confidence: 97%

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Cambrian trilobite biostratigraphy and its role in developing an integrated history of the Earth system

Babcock

Shanchi

Ahlberg

2017

LET

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One of the principal biostratigraphical tools used in the lower Palaeozoic, and especially the Cambrian System, is trilobites. Historically, both polymerids and agnostoids have commonly been included as ‘trilobite’ groups, although currently the question of whether they comprise a monophyletic group or are polyphyletic is unsettled. Beginning in the late 1800s, the base of the Cambrian System was marked by the lowest occurrence of olenelline trilobites. Discovery of a rich pre‐trilobite metazoan record in the mid‐1900s led to significant modification of that concept, but polymerids and especially agnostoids still rank among the leading biostratigraphical and chronostratigraphical guides through much of the Cambrian. Chronostratigraphical sub‐division of the trilobite‐bearing part of the Cambrian System derives largely from biostratigraphical, ecological and evolutionary concepts about agnostoids and polymerids introduced in the 1940s to 1970s by A.H. Westergård, A.R. Palmer and R.A. Robison. Westergård introduced a zonation for Scandinavia that was largely based on agnostoids. Palmer explained the distribution of Cambrian trilobite faunas in terms of restricted and unrestricted access to open oceans. Together, these ideas coalesced in Robison's recognition of separate zonation schemes for restricted‐shelf polymerids, open‐shelf polymerids and open‐shelf (cosmopolitan) agnostoids. Palmer also introduced the concept of biomeres, which placed sharp limits on biostratigraphical intervals recognizable from trilobites. Global correlation in the upper half of the Cambrian today depends to a large extent on the ranges of agnostoids and some polymerids characteristic of open‐shelf to slope areas, ones that facilitate identification of precise intercontinental tie points. Agnostoid and polymerid biostratigraphy is now being integrated with information about coastal onlap and eustatic sea‐level history, geochemical cycling and other data to provide a more complete understanding of the early Palaeozoic biosphere and its complex physico‐chemical context.

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“…The Ptychagnostus atavus Zone, that defines the base of the global Drumian Stage (Babcock et al, 2007), has recently been recognized in the Machari Formation of the Yeongwol Group (Hong and Choi, 2015) and is correlated with those of South China (Peng and Robison, 2000), Australia (Kruse et al, 2009), and Laurentia (Babcock et al, 2007). In China, the Ptychagnostus atavus Zone of South China has been collectively correlated with the Inouyella, Crepicephalina, and partly Amphoton zones of North China (Zhou and Zhen, 2008).…”

Section: Drumianmentioning

confidence: 99%

Trilobite Biostratigraphy of the lower Paleozoic (Cambrian–Ordovician) Joseon Supergroup, Taebaeksan Basin, Korea

Choi

Lee

et al. 2016

Acta Geologica Sinica (Eng)

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In Korea, trilobites are among the most intensively studied fossil groups in the past century and provide invaluable information about lower Paleozoic stratigraphy, paleogeography, and tectonics of the Korean Peninsula. Trilobites occur in the lower Paleozoic Joseon Supergroup of the Taebaeksan Basin which was part of the Sino‐Korean Craton in the Paleozoic. The Joseon Supergroup is divided into the Taebaek, Yeongwol, and Mungyeong groups. The Taebaek and Yeongwol groups are richly fossiliferous, while the Mungyeong Group is poorly fossiliferous. Contrasting trilobite faunal contents of the Taebaek and Yeongwol groups resulted in two separate biostratigraphic schemes for the Cambrian–Ordovician of the Taebaeksan Basin. A total of 22 biozones or fossiliferous horizons were recognized in the Taebaek Group; 19 zones were established in the Yeongwol Group; and four biozones were known from the Mungyeong Group. These trilobite biozones of the Taebaeksan Basin indicate the Joseon Supergroup ranges in age from the Cambrian Series 2 to Middle Ordovician and can be correlated well with the formations of North China, South China, and Australia.

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The Global boundary Stratotype Section and Point (GSSP) of the Drumian Stage (Cambrian) in the Drum Mountains, Utah, USA

Cited by 69 publications

References 30 publications

An epiphytacean-Girvanella (Cyanobacteria) symbiosis from the Cambrian (Series 3, Drumian) of North Greenland (Laurentia)

An epiphytacean-Girvanella (Cyanobacteria) symbiosis from the Cambrian (Series 3, Drumian) of North Greenland (Laurentia)

Cambrian trilobite biostratigraphy and its role in developing an integrated history of the Earth system

Trilobite Biostratigraphy of the lower Paleozoic (Cambrian–Ordovician) Joseon Supergroup, Taebaeksan Basin, Korea

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