The Cambrian Lower Boundary Problem

Rozanov, A. Yu.

doi:10.1017/s0016756800049165

Cited by 67 publications

(110 citation statements)

References 3 publications

(1 reference statement)

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“…Remarks.-The cross-section and ornamentation of the conchs are typical of Allatheca corrugata Missarzhevsky in Rozanov et al, 1969(tentatively synonymised herein with A. anabarica Val'kov, 1975. The illustrated individuals are therefore interpreted as probable juveniles of typically larger, several cm-sized Allatheca corrugata, which are reported from the middle part of Emyaksin Formation (Val'kov 1975(Val'kov , 1987 Conotheca cf.…”

Section: Majatheca Tumefactamentioning

confidence: 98%

“…Calcium phosphatic disarticulated sclerites of tommotiids include Camenella garbowskae Missarzhevsky in Rozanov and Missarzhevsky, 1966 and Lapworthella dentata Missarzhevsky in Rozanov et al, 1969. The sellate sclerites, Camenella garbowskae and mitral sclerites, C. kozlowskii are unified within one species, C. garbowskae.…”

Section: Fauna Of the Middle-upper Emyaksin Formationmentioning

confidence: 99%

“…Phylum uncertain Class Hyolitha Marek, 1963Order Orthothecida Marek, 1966 Family uncertain Genus Majatheca Missarzhevsky in Rozanov et al, 1969 Type species: Majatheca tumefacta Missarzhevsky in Rozanov et al, 1969;upper Tommotian Stage, lower Cambrian;Tiktirikteekh, near Churan village, middle Lena River, Siberian Platform. Missarzhevsky in Rozanov et al, 1969 Figs.…”

Section: Enigmaconus? Pyramidalismentioning

confidence: 99%

“…The illustrated individuals are therefore interpreted as probable juveniles of typically larger, several cm-sized Allatheca corrugata, which are reported from the middle part of Emyaksin Formation (Val'kov 1975(Val'kov , 1987 Conotheca cf. C. mammilata Missarzhevsky in Rozanov et al, 1969 Figs. 25E-G, 26K, 27A-E, H.…”

Section: Majatheca Tumefactamentioning

confidence: 99%

“…27A, B). Missarzhevsky in Rozanov et al, 1969 is known from the Tommotian and Atdabanian Stages of Siberia. In the type material, the apical angle ranges from 8-20° and the presence of both robust and gracile forms was indicated in the original description of C. mammilata by Missarzhevsky (in Rozanov et al 1969: 113).…”

Section: Majatheca Tumefactamentioning

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: Majatheca Tumefactamentioning

confidence: 98%

Section: Fauna Of the Middle-upper Emyaksin Formationmentioning

confidence: 99%

Section: Enigmaconus? Pyramidalismentioning

confidence: 99%

Section: Majatheca Tumefactamentioning

confidence: 99%

Section: Majatheca Tumefactamentioning

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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New and revised small shelly fossil record from the lower Cambrian of northern Iran

Devaere

Korn

Ghaderi

et al. 2021

Papers in Palaeontology

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Small shelly fossils (SSFs) are highly informative of the ‘Cambrian explosion’. Their palaeobiodiversity has been documented from lower Cambrian deposits worldwide but it remains elusive in areas such as Iran, despite this region occupying a critical position on the north‐western Gondwana margin during the early Cambrian. This new study of the SSFs of the lower Cambrian of northern Iran provides a large new dataset from this understudied area. We revise the micropalaeontological signal of the Soltanieh Formation of the Alborz Mountains and introduce novel data from the Soltanieh and overlying Barut Formations of the Soltanieh Mountains. The new, solid taxonomic and stratigraphic SSF data enable us to distinguish two successive microfaunal assemblages. The first occurs in the Soltanieh Formation of the Soltanieh and Alborz Mountains and is dominated by anabaritids (Anabarites trisulcatus, A. ex gr. trisulcatus, A. tristichus, A. dalirense sp. nov., Cambrotubulus decurvatus) along with protoconodonts (Protohertzina anabarica and P. unguliformis), maikhanellids (Maikhanella multa, Purella squamulosa and Purella sp.), Aetholicopalla adnata, indeterminate cones and irregular tubes. The second assemblage, from the Barut Formation, is dominated by a diverse assemblage of molluscs (Oelandiella korobkovi and cap‐shaped morphotypes). Siphogonuchitid sclerites also occur in both assemblages. The two SSF assemblages are characteristic of the Terreneuvian. Our dataset enables us to assess the sequence of faunal change of the Ediacaran–Cambrian transition; in contrast to the tube–sclerite–brachiopod succession presented in the literature, the Iranian fauna changes from one dominated by tubes and sclerites, to one dominated by molluscs and sclerites.

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The Lower Cambrian Fossil Record of the Soviet Union

Rozanov

Zhuravlev

1992

Topics in Geobiology

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The Cambrian Lower Boundary Problem

Cited by 67 publications

References 3 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

New and revised small shelly fossil record from the lower Cambrian of northern Iran

The Lower Cambrian Fossil Record of the Soviet Union

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