Cambrian trilobite Ovatoryctocara Tchernysheva, 1962 from Siberia

Naimark, E. B.; Shabanov, Yu. Ya.; Korovnikov, I. V.

doi:10.3140/bull.geosci.1272

Cited by 12 publications

(11 citation statements)

References 3 publications

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“…Some polymerids (notably oryctocephalids, eodiscoids, condylopygids, paradoxidids, conocoryphids, ceratopygids and olenids; e.g. Jell 1974;Babcock 1994b,c;Sundberg & McCollum 1997;Ahlberg 2003;Fletcher 2003Fletcher , 2007Hong et al 2003;Geyer & Peel 2011;Alvaro & Vizca€ ıno 2003;Zhao et al 2005;Naimark et al 2011) were distributed intercontinentally, but most tended to be more endemic to individual palaeocontinents (Kobayashi 1971(Kobayashi , 1972Jell 1974;Chang 1989;Babcock 1994b,c;Korovnikov 2005;Peng et al 2012a;Alvaro et al 2013). Separate biogeographical schemes for polymerids and agnostoids have been developed that are particularly applicable in continents that were in low palaeolatitudes, where inner-shelf facies were intermittently separated from outer-shelf facies by carbonate platforms (Robison 1976;Pegel 2000;Peng et al 2004b;Robison & Babcock 2011;Fig .…”

Section: Cambrian Chronostratigraphy and Biostratigraphy Todaymentioning

confidence: 99%

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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Section: Cambrian Chronostratigraphy and Biostratigraphy Todaymentioning

confidence: 99%

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

Babcock

Shanchi

Ahlberg

2017

LET

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“…; Naimark et al . ) and North Greenland (Geyer & Peel ). Therefore, we suggest that the zone containing this species in Siberia should be renamed the O. granulata Zone.…”

Section: Intercontinental Correlationmentioning

confidence: 99%

The oryctocephalid trilobite zonation across the Cambrian Series 2-Series 3 boundary at Balang, South China: a reappraisal

Zhao

Yuan

Esteve³

et al. 2017

LET

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A systematic revision of the oryctocephalid trilobites provides additional data for the definition of a revised zonation of the Cambrian Series 2‐Series 3 boundary at Balang in South China. The zonation offers a new understanding of the biostratigraphical correlation of this debated limit. The biostratigraphical revision was carried out in the Wuliu‐Zengjiayan Section and provides the following trilobite zones: (1) Protoryctocephalus arcticus; (2) Bathynotus kueichouensis—Ovatoryctocara sinensis Zone (upper part of Cambrian Series 2); and (3) Oryctocephalus indicus Zone (base of Cambrian Series 3). This suggests that this section is a suitable candidate GSSP for the base of Cambrian Series 3, Stage 5. The correlation in the Wuliu‐Zengjiayan Section suggests that the P. arcticus Zone and the B. kueichouensis—O. sinensis Zone can be correlated with the Ovatoryctocara granulata Zone, while the O. indicus Zone is time‐equivalent to the Oryctocephalus reticulatus Zone in Siberia. The P. arcticus Zone and the B. kueichouensis—O. sinensis Zone can be correlated with the Eoagnostus roddyi—Arthricocephalus chauveaui Zone and the Bonnia—Pagetides elegans Zone in North Greenland, as well as with the upper part of the Olenellus Zone, Nephrolenellus multinodus Zone in North America.

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“…Remarks. -Some specimens previously reported as Ovatoryctocara granulata from the Kaili Formation (Yuan et al 2001Zhao et al 2001aZhao et al , 2007 differ from the type material (Naimark et al 2011) in having a longer (exsag.) posterior area of the fixigena, shorter (exsag.)…”

Section: Metabalangia Yupingensis Qian and Yuan (In Zhang Et Al 1980)mentioning

confidence: 99%

Detailed trilobite biostratigraphy across the proposed GSSP for Stage 5 (“Middle Cambrian” boundary) at the Wuliu-Zengjiayan section, Guizhou, China

Sundberg¹,

Zhao²,

Yuan³

et al. 2011

Bull. Geosci.

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Quarrying across a potential GSSP of the base of Cambrian Stage 5/Series 3 at the Wuliu-Zengjianyan section in south China indicates a significant change in trilobite and brachiopod faunas. The Wuliu Quarry spans approximately 4.5 m across the potential boundary, which is the FAD of Oryctocephalus indicus (Reed, 1910) in the Wuliu-Zengjiayan section of the Kaili Formation. Trilobite taxa found consist of one Pagetia, one Redlichia, one Burlingia, two Olenoides, eleven oryctocephalid, and seven ptychopariid species. Non-trilobite taxa found in the Wuliu Quarry, but not described in this publication, include tubular shells, inarticulate and articulate brachiopods, molluscs, echinoderm plates, sponges, algae, acritarchs, and trace fossils. Collected specimens display both flattening, secondary calcite preservation, and tectonic distortion. Many of the species have previously been based on length to width ratios. Given the range of morphologies demonstrated in these collections, several previously named species have been synonymized. Detailed collections from the Wuliu Quarry show that the faunas of the Ovatoryctocara cf. granulata-Bathyonotus holopygus and the O. indicus zones changed in a 20 cm, relatively barren interval. This faunal turnover does not coincide with a lithologic change and suggests that the section would be a good location for the GSSP of the base of Cambrian Stage 5/Series 3.•

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Cambrian trilobite Ovatoryctocara Tchernysheva, 1962 from Siberia

Cited by 12 publications

References 3 publications

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

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

The oryctocephalid trilobite zonation across the Cambrian Series 2-Series 3 boundary at Balang, South China: a reappraisal

Detailed trilobite biostratigraphy across the proposed GSSP for Stage 5 (“Middle Cambrian” boundary) at the Wuliu-Zengjiayan section, Guizhou, China

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