Zonation of the Siberian Ordovician deposits based on pelagic groups of fauna

Сенников, Н В; Tolmacheva, T. Yu.; Обут, О Т; Изох, Н Г; Lykova, E.V.

doi:10.1016/j.rgg.2015.03.010

Cited by 13 publications

(10 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Other material mentioned is stored in the Natural History Museum, London, UK (NHMUK). Global stages and subdivisions follow Bergstr€ om et al (2009) while the Siberian stages and correlations are based on Sennikov et al (2015) and Kanygin et al (2017). Although the units applied here may represent 'horizons' in Russian terminology ($stages in non-Russian terminology), they are treated as stratigraphical formations (see discussion in Ebbestad & Fortey 2019).…”

Section: Geological Setting and Materialsmentioning

confidence: 99%

See 1 more Smart Citation

Late Ordovician trilobites from the Taimyr Peninsula, Arctic Russia

Ebbestad

Fortey

2019

Journal of Systematic Palaeontology

View full text Add to dashboard Cite

Ordovician trilobites from the important sequences of the Taimyr Peninsula, Arctic Russia have been poorly studied since the work by Balashova (1959, 1960). Newly collected and well-preserved specimens from Late Ordovician sections, along with the original collections of Balashova, form the basis of a reappraisal of 56 Upper Ordovician (Sandbian-Katian) trilobites. New species include Bronteopsis tenuirhachis, Dionide trigintasegmentata, Failleana superba, Pararemopleurides ornatissimus, Raymondella plastron, Robergia subtilis and R. nikolaiseni. Probable new species include: Stenopareia sp. aff. S. glaber, and Stygina sp. aff. S. latifrons. A new subgenus Bilobaspis of the monorakine genus Evenkaspis, and a new species, Evenkaspis (Bilobaspis) mirabilis, are proposed. Thoracic segments and pygidium are correctly associated for the first time with cephala of the hitherto poorly understood Taimyraspis. The genera Effnaspis and Yumenaspis are likely junior synonyms of Taimyraspis. A placement within the Ityophoridae is suggested for Taimyraspis, together with the closely related genera Ityophorus and Frognaspis. Comparison of Goldillaenoides taimyricus with Failleana suggests that these are also closely related. A provisional placement of the former in the Styginidae is adopted. Bronteopsis nannus Balashova could be a juvenile B. tenuirhachis, and is regarded as a nomen dubium. The genus Ceratevenkaspis dominates among the monorakines on Taimyr, while Monorakos itself has not been collected. Robergia nikolaiseni has a narrow cranidial border, which is also present in the type species of Robergia. Two biofacies are identified in the current collections. The first, the raphiophorid association, is widespread around low latitude Ordovician palaeocontinents, identifying marginal shelf sites; the association is not critical in defining palaeocontinents themselves. Inner shelf faunas of the monorakine-cheirurid-illaenid association have taxa that comprise a distinctive group with a strong link between Taimyr and the Ordovician Siberian craton. The trilobites described herein support reconstructions showing Taimyr peripheral to the Siberian craton during the Ordovician.

show abstract

Section: Geological Setting and Materialsmentioning

confidence: 99%

“…The single limestone bed yielded trilobites, ostracodes, brachiopods and gastropods. The unit encompasses the N. gracilis to C. clingani graptolite zones (Sennikov et al 2015), and the specimens collected are probably from the lower zone.…”

Section: Engelgardt Lake Localitymentioning

confidence: 99%

Late Ordovician trilobites from the Taimyr Peninsula, Arctic Russia

Ebbestad

Fortey

2019

Journal of Systematic Palaeontology

View full text Add to dashboard Cite

show abstract

“…4 ) are tied to the Siberian regional stages 43 44 . However, these stages are problematic to correlate to the international Ordovician stages, since they are largely based on endemic shelly faunas 45 46 . In contrast, data from the Mójcza 47 and the Gullhögen sections 48 have a well-defined conodont-based biostratigraphy.…”

Section: Resultsmentioning

confidence: 99%

“…In Siberia, early Baksanian strata contain the graptolite Oepikograptus bekkeri 46 , which has been used as an analogy for the cosmopolitan early Sandbian, Nemagraptus gracilis Zone. (ref.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Geomagnetic reversal rates following Palaeozoic superchrons have a fast restart mechanism

Hounslow

2016

Nat Commun

View full text Add to dashboard Cite

Long intervals of single geomagnetic polarity (superchrons) reflect geodynamo processes, driven by core–mantle boundary interactions; however, it is not clear what initiates the start and end of superchrons, other than superchrons probably reflect lower heat flow across the core–mantle boundary compared with adjacent intervals. Here geomagnetic polarity timescales, with confidence intervals, are constructed before and following the reverse polarity Kiaman (Carboniferous–Permian) and Moyero (Ordovician) superchrons, providing a window into the geodynamo processes. Similar to the Cretaceous, asymmetry in reversal rates is seen in the Palaeozoic superchrons, but the higher reversal rates imply higher heatflow thresholds for entering the superchron state. Similar to the Cretaceous superchron, unusually long-duration chrons characterize the ∼10 Myr interval adjacent to the superchrons, indicating a transitional reversing state to the superchrons. This may relate to a weak pattern in the clustering of chron durations superimposed on the dominant random arrangement of chron durations.

show abstract

Stratigraphy and trilobite biofacies of the Late Ordovician of the Taimyr Peninsula, Arctic Russia

Ebbestad¹,

Fortey²

2019

Fossils and Strata

View full text Add to dashboard Cite

Zonation of the Siberian Ordovician deposits based on pelagic groups of fauna

Cited by 13 publications

References 21 publications

Late Ordovician trilobites from the Taimyr Peninsula, Arctic Russia

Late Ordovician trilobites from the Taimyr Peninsula, Arctic Russia

Geomagnetic reversal rates following Palaeozoic superchrons have a fast restart mechanism

Stratigraphy and trilobite biofacies of the Late Ordovician of the Taimyr Peninsula, Arctic Russia

Contact Info

Product

Resources

About