A middle Cambrian fauna of skeletal fossils from the Kuonamka Formation, northern Siberia

Kouchinsky, Artem; Bengtson, Stefan; Clausen, Sébastien; Gubanov, Alexander P.; Malinky, John M.; Peel, John S.

doi:10.1080/03115518.2010.496529

Cited by 46 publications

(67 citation statements)

References 63 publications

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“…Hagionella cultrata (Missarzhevsky, 1977) is also found in the Emyaksin Formation, in beds attributed herein to the Delgadella anabara Zone. Protoconodonts, including several unnamed forms, are very rare in the Emyaksin Formation, but become common in the overlying Kuonamka Formation (see also Kouchinsky et al 2011). The occurrence of Gapparodus bisulcatus reported herein from the lower part of Cambrian Stage 4 is the earliest one known from the Siberian Platform, where this form also occurs in the Cambrian Stage 5, Kuonamka Formation (Kouchinsky et al 2011).…”

Section: Fauna Of the Middle-upper Emyaksin Formationmentioning

confidence: 93%

“…The lowermost part of the section belongs to the uppermost Emyaksin Formation represented by bioturbated fossiliferous greenish-grey, glauconitic, lime mudstone with wacke-and packstone. Those are interbedded with greenish-grey shale, especially in the uppermost 3 m, and overlain by the Kuonamka Formation (see Kouchinsky et al 2011). Other sections cut through the bioturbated fossiliferous reddish-maroon and greenish-grey lime mud-and wackestone of the middle-upper parts of the Emyaksin Formation.…”

Section: Methodsmentioning

confidence: 99%

“…Description of fauna from the lower part of the Emyaksin Formation in complementary outcrops at the Bol'shaya Kuonamka River (below that zero level) will be published elsewhere. Fauna from the overlying Kuonamka Formation is published by Gubanov et al (2004) and Kouchinsky et al (2011). sented by calcium phosphatic internal moulds, as well as by phosphatised conchs and opercula, recovered in remarkable diversity from samples 7/36.7, K1-3B, and 7/70, including opeculum Triplicatella papilio Kouchinsky sp. nov. Halkieriids are represented by rare phosphatised sclerites and internal moulds of Halkieria sp.…”

Section: Fauna Of the Middle-upper Emyaksin Formationmentioning

confidence: 99%

“…Remarks.-The moulds were collected from the type beds of Leptostega hyperborea Parkhaev, 2005 Geyer, 1986 was first described from the basal middle Cambrian of Spain (Geyer 1986; see Kouchinsky et al 2011: 133 for comparison of L. irregularis Geyer, 1986 with L. hyperborea), Acadoparadoxides mureroensis Zone, lower Leonian Stage. The lower part of the zone can be correlated with the upper Toyonian Stage of Siberia (Geyer 1998(Geyer , 2005Geyer and Landing 2004) and the Series 2/Series 3 transition.…”

Section: Leptostega Hyperboreamentioning

confidence: 99%

“…The description of "Small Shelly Fossil" faunas of the middle and upper parts of the Emyaksin Formation presented herein continues the chronicle of fossils from the overlying and younger Kuonamka Formation (Gubanov et al 2004;Kouchinsky et al 2011), in the same area of the Malaya Kuonamka and Bol'shaya Kuonamka rivers, eastern flanks of the Anabar Uplift of the northern Siberian Platform. Skeletal fauna from the underlying strata of the lower part of the Emyaksin, Medvezhya and Manykay formations of the eastern and western flanks of the Anabar Uplift as well as brachiopods from the middle-upper Emyaksin and Kuonamka Formations are yet under investigation.…”

Section: Introductionmentioning

confidence: 99%

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A bradoriid and brachiopod dominated shelly fauna from the Furongian (Cambrian) of Västergötland, Sweden

et al. 2013

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A small assemblage of shelly fossils, dominated by the brachiopod Treptotreta jucunda and the bradoriid arthropod Mongolitubulus aspermachaera new species is described from a Furongian limestone of Västergötland, south-central Sweden. Mongolitubulus aspermachaera is represented in the assemblage by individual valves and numerous, ornamented spines. Valves and spines share identical ornament and microstructure leaving no doubt that the isolated spines were once attached to the bradoriid valves. Mongolitubulus aspermachaera adds to the increasing list of spinose Cambrian bradoriid arthropods, and Mongolitubulidae new family is erected here to incorporate the genera Mongolitubulus, Tubuterium and Spinospitella. Mongolitubulus aspermachaera represents the youngest member of the new family and supplements the biodiversity of bradoriids in the Furongian, an interval when bradoriid diversity is considered to be very much on the decline. The brachiopod Treptotreta jucunda described predominantly from the ‘middle' to ‘late' Cambrian of Australia is here documented for the first time from outside Gondwana, dramatically extending the biogeographical range of the species. Other elements of the faunal assemblage include typical Baltic Furongian representatives, such as the trilobite Parabolina, the agnostoid Agnostus and the phosphatocopids Hesslandona and Vestrogothia.

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Section: Fauna Of the Middle-upper Emyaksin Formationmentioning

confidence: 93%

Section: Methodsmentioning

confidence: 99%

Section: Fauna Of the Middle-upper Emyaksin Formationmentioning

confidence: 99%

Section: Leptostega Hyperboreamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A bradoriid and brachiopod dominated shelly fauna from the Furongian (Cambrian) of Västergötland, Sweden

et al. 2013

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Chancelloriid sclerites from the Dyeran–Delamaran (‘Lower–Middle’ Cambrian) boundary interval of the Pioche–Caliente region, Nevada, USA

Moore

Porter

Webster

et al. 2019

Papers in Palaeontology

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Chancelloriids are a poorly understood group of phylogenetically problematic Cambrian metazoans; complete specimens show they were sessile, radially symmetrical, club‐shaped organisms covered with sclerites in the form of rosettes of spines. While isolated sclerites are common components of Cambrian shelly assemblages, they have been relatively little studied. We describe chancelloriid sclerites from a series of nine sections spanning the upper Dyeran to lower Delamaran stages (latest Stage 4 to perhaps basal Wuliuan) from the Pioche–Caliente region of east‐central Nevada, USA. Acid maceration of samples from the Combined Metals, Comet Shale and Susan Duster Limestone members of the Pioche Formation yielded more than 2000 sclerites. Based on careful examination of these sclerites and statistical analyses of co‐occurring sclerite types, we distinguish six species, each with a restricted stratigraphic range. Chancelloria impar Moore sp. nov. is the dominant species in most upper Dyeran samples. Archiasterella cometensis Moore sp. nov. and A. auriculata Moore sp. nov. are rare in the upper Dyeran but abundant in the lowest Delamaran; A. uncinata Moore sp. nov. and C. lilioides Moore sp. nov. replace these in younger samples. A. auriculata is noteworthy for sharing features with species of both Archiasterella and Chancelloria. These results provide further support for the taxonomic tractability and biostratigraphical utility of chancelloriid sclerites; large collections from single horizons allow intraspecific variability to be assessed and species to be distinguished. Our results document a taxonomic turnover in chancelloriids at the Dyeran–Delamaran boundary, showing that not only trilobites were affected at this time.

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Small shelly fossils and carbon isotopes from the early Cambrian (Stages 3–4) Mural Formation of western Laurentia

Skovsted

Balthasar

Vinther

et al. 2020

Papers in Palaeontology

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The extraordinary window of phosphatized and phosphatic small shelly fossils (SSF) during the early and middle Cambrian is an important testament to the radiation of biomineralizing metazoans. While SSF are well known from most Cambrian palaeocontinents during this time interval, western Laurentia has relatively few SSF faunas.Here we describe a diverse SSF fauna from the early Cambrian (Stages 3-4) Mural Formation at three localities in Alberta and British Columbia, Canada, complemented by carbon isotope measurements to aid in a potential future bio-chemostratigraphic framework. The fauna expands the recorded SSF assemblage diversity in western Laurentia and includes several brachiopods, four bradoriids, three chancelloriids, two hyoliths, a tommotiid and a helcionellid mollusc as well as echinoderm ossicles and specimens of Microdictyon, Volborthella and Hyolithellus. New taxa include the tommotiid genus Canadiella gen. nov., the new bradoriid species Hipponicharion perforata sp. nov. and Pseudobeyrichona taurata sp. nov. Compared with contemporaneous faunas from western Laurentia, the fauna is relatively diverse, particularly in taxa with originally phosphatic shells, which appear to be associated with archaeocyathid build-ups. This suggests that the generally low faunal diversity in western Laurentia may be at least partly a consequence of poor sampling of suitable archaeocyathan reef environments. In addition, the tommotiid Canadiella filigrana appears to be of biostratigraphical significance in Cambrian Stage 3 strata of western Laurentia, and the unexpected high diversity of bradoriid arthropods in the fauna also suggests that this group may prove useful for biostratigraphical resolution in the region.

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A middle Cambrian fauna of skeletal fossils from the Kuonamka Formation, northern Siberia

Cited by 46 publications

References 63 publications

A bradoriid and brachiopod dominated shelly fauna from the Furongian (Cambrian) of Västergötland, Sweden

A bradoriid and brachiopod dominated shelly fauna from the Furongian (Cambrian) of Västergötland, Sweden

Chancelloriid sclerites from the Dyeran–Delamaran (‘Lower–Middle’ Cambrian) boundary interval of the Pioche–Caliente region, Nevada, USA

Small shelly fossils and carbon isotopes from the early Cambrian (Stages 3–4) Mural Formation of western Laurentia

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