Evolution of Trilobite Biofacies in Cambrian Basins of the Siberian Platform

Pegel, Tatyana V.

doi:10.1666/0022-3360(2000)074<1000:eotbic>2.0.co;2

Cited by 40 publications

(37 citation statements)

References 2 publications

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“…Similarly, L. "trisectus" as illustrated from Sweden (Rushton 2009, fig. 1E, F, H-J) and Siberia (Pegel 2000, fig. 15.6, 15.10) is clearly differentiated from L. americanus by the strongly defined trisection of the pygidial posteroaxis and by longer basal glabellar lobes that are notched into the posteroaxis behind M2.…”

Section: Discussion -Rushton (2009) Recently Reviewed L Americanusmentioning

confidence: 99%

“…In recent years, L. hedini has been reported from Member V of the Ogon'or Formation along the Khos-Nelege River of Siberia (Pegel 2000, Lazarenko et al 2008. Lazarenko et al (2008) illustrated a cephalon and pygidium from each of two different stratigraphic levels, but they do not appear to represent a single species, and neither pair of sclerites is conspecific with L. hedini from China or Kazakhstan.…”

Section: Discussion -Rushton (2009) Recently Reviewed L Americanusmentioning

confidence: 99%

“…Thus, the long-standing practice of assigning sclerites from regions beyond England and Wales to L. trisectus is dubious at best, and we recommend that it be discontinued until uncompacted and undeformed specimens are available from the type area for comparison. We can say that the cephalon from Siberia identified as L. trisectus by Pegel (2000, fig. 15.6; later transferred to L. americanus by Lazarenko et al 2008, pl.…”

Section: Biostratigraphymentioning

confidence: 99%

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The Cambrian (Sunwaptan, Furongian) agnostoid arthropod Lotagnostus Whitehouse, 1936, in Laurentian and Avalonian North America: systematics and biostratigraphic significance.

Westrop¹,

Adrain²,

Landing³

2011

Bull. Geosci.

119

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Restudy of type and other material shows that the Cambrian (Sunwaptan, Furongian) agnostoid arthropod Lotagnostus americanus (Billings, 1860), far from being distributed globally, can be identified with confidence only at its type locality of Quebec. As such, it is ill-suited as an index for international correlation. Lotagnostus obscurus Palmer, 1955, from Nevada is not a synonym of L. americanus and is most similar to other effaced species from Australia. Sclerites from Avalonian Canada are represented by perhaps as many as two species, one of which is L. germanus (Matthew, 1901), and the other is similar to the type species, L. trisectus (Salter, 1864). However, loss of information due to compaction makes L. trisectus difficult to interpret in its type region of Avalonian Britain, and possible occurrences in other areas are therefore questionable at best. At the current state of knowledge, this species name should not be applied outside of Avalonian Britain. Aside from L. obscurus, which may possibly appear in slightly older strata, all Laurentian occurrences are confined to Upper Sunwaptan successions. Most are in the Illaenurus and Prosaukia pyrene zones, although review of material assigned to L. hedini (Troedsson, 1937) in western Newfoundland suggests that this species may occur, albeit questionably, only in the basal Skullrockian Phylacterus saylesi Fauna; indeterminate species occur in the Keithia schucherti Fauna in the latter region. Occurrences in Avalonian Canada are all from the upper Peltura Zone, and are likely somewhat younger (Saukiella junia Subzone and correlatives) than those in Laurentian successions

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Section: Discussion -Rushton (2009) Recently Reviewed L Americanusmentioning

confidence: 99%

Section: Discussion -Rushton (2009) Recently Reviewed L Americanusmentioning

confidence: 99%

Section: Biostratigraphymentioning

confidence: 99%

See 1 more Smart Citation

The Cambrian (Sunwaptan, Furongian) agnostoid arthropod Lotagnostus Whitehouse, 1936, in Laurentian and Avalonian North America: systematics and biostratigraphic significance.

Westrop¹,

Adrain²,

Landing³

2011

Bull. Geosci.

119

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“…Thus, even similar archaeocyath genera are rare in Dictyosycon Khasaktia boundstone developed in the Leptosocyathus polyseptus Zone, as compared to RenalcisEpiphyton mudmounds of the Retecoscinus zegebarti Zone (ZhurAvlevA, Korshunov, & roZAnov, 1969;vArlAmov & others, 1984;ZhurAvlev & nAimArK, 2005). Other early Cambrian animal groups, for example, trilobites (PAlmer, 1998;Pegel, 2000;álvAro & others, 2003), were probably similar in this respect.…”

Section: Biostratigraphymentioning

confidence: 99%

Treatise Online, no. 38: Part E, Revised, Volume 4, Chapter 18: General features of the Archaeocyatha

Debrenne¹,

Zhuravlev²,

Kruse³

2012

TREON

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“…As shown in Fig. 2 (see references in the Appendix), these include Laurentian localities in Nevada and possibly the melange blocks of Laurentian north Argentina; the KhosNelege River region, northeast Siberian Platform (Pegel 2001); the Maly and Bolishoi Karatau, Kazakhstan; and a number of areas in east Gondwana across China from Tien Shan to Anhui (see Peng & Babcock 2005 and Appendix) and apparently from deep-water sequences in Tasmania and New Zealand.…”

Section: Paleoenvironmental Distribution Of Lotagnostusmentioning

confidence: 99%

The Lawsonian Stage - the Eoconodontus notchpeakensis FAD and HERB carbon isotope excursion define a globally correlatable terminal Cambrian stage

Landing¹,

Westrop²,

Adrain³

2011

Bull. Geosci.

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The best definition for the base of the terminal Cambrian (Stage 10) is the conodont Eoconodontus notchpeakensis FAD ± onset of the HERB carbon isotope excursion. These horizons allow precise intercontinental correlations in deep marine to peritidal facies. The agnostoid Lotagnostus americanus (Billings, 1860) FAD has been suggested as a Stage 10 base, but restudy of types and typotypes shows that the species occurs only in Late Cambrian (Sunwaptan) debris flow boulders in Quebec (Westrop et al., this volume). Non-Quebec reports of "L. americanus" are an amalgum of small samples of often poorly documented specimens with effaced–highly furrowed cephala and pygidia and with or without a highly trisected pygidial posteroaxis. Many of these occurrences have local species names, but no evidence suggests that they record intraspecific variation of a globally distributed taxon. They are not synonyms of L. americanus. Lotagnostus, largely a dysoxic form, does not allow precise correlation into oxygenated platform facies. Another proposal used the conodont Cordylodus andresi FAD as a Stage 10 base, but other work shows this FAD is diachronous. An unrealistic approach to L. americanus’ systematics and the correlation uncertainty of C. andresi are overcome by defining a Stage 10 base at the globally recognizable E. notchpeakensis FAD, with the C. andresi FAD a useful proxy on cool-water continents. The "Lawsonian Stage", named for Lawson Cove in western Utah, has a basal GSSP at the E. notchpeakensis FAD and replaces informal Stage 10. The Lawsonian, ~150 m-thick in western Utah, underlies the basal Ordovician Iapetognathus Zone

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Evolution of Trilobite Biofacies in Cambrian Basins of the Siberian Platform

Cited by 40 publications

References 2 publications

The Cambrian (Sunwaptan, Furongian) agnostoid arthropod Lotagnostus Whitehouse, 1936, in Laurentian and Avalonian North America: systematics and biostratigraphic significance.

The Cambrian (Sunwaptan, Furongian) agnostoid arthropod Lotagnostus Whitehouse, 1936, in Laurentian and Avalonian North America: systematics and biostratigraphic significance.

Treatise Online, no. 38: Part E, Revised, Volume 4, Chapter 18: General features of the Archaeocyatha

The Lawsonian Stage - the Eoconodontus notchpeakensis FAD and HERB carbon isotope excursion define a globally correlatable terminal Cambrian stage

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