13th International Field Conference of the Cambrian Stage Subdivision Working Group (Siberian Platform, Western Yakutia)

Rozanov, A. Yu.; Shabanov, Yu. Ya.; Pegel, Tatyana V.; Raevskaya, Elena; Parkhaev, P. Yu.; Zhuravlev, Andrey Yu.; Vintaned, José Antonio Gámez; Ergaliev, G. H.

doi:10.1134/s0031030109030150

Cited by 4 publications

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“…The Sinsk biota of Ivantsov et al (2005a, p. 70) belongs to the Bergeroniellus gurarii Trilobite Zone of the early Cambrian Botomian Regional Stage (see Rozanov et al 2008). Krassilov (2005, p. 41) reported the occurrence in the Inikan Formation, middle Maya River, Yakutia) -Amganian Regional Stage (equals to upper Stage 4 to lower Drumian, after Peng et al, 2012).…”

Section: Comparison Of Morphology Of Krejciella With Margaretia and A...mentioning

confidence: 99%

Putative Ordovician green alga Krejciella reinterpreted as enteropneust hemichordate tube (Czech Republic)

Fatka

Vodička

2022

Palaeontol Electron

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Fossil and extant representatives of Enteropneusta play an important role in the interpretation of early evolution of animals, such as echinoderms, hemichordates and chordates. However, remains of fossil Enteropneusta are rare. Re-examination of available specimens of organic tubes of the Ordovician putative green alga Krejciella putzkeri Obrhel 1968 does not show any morphological difference from the Cambrian Margaretia dorus Walcott, 1931. The latter species has been recently interpreted as an organic tube produced and inhabited by the worm-like enteropneust hemichordate Oesia disjuncta Walcott, 1911. However, the absence of the subterranean lateral extension in Ordovician specimens excludes the synonymy of Krejciella and Margaretia. Geographic distribution of Cambrian organic tubes classified as Margaretia Walcott, 1931 indicates a possible latitudinal control, as all occurrences are apparently restricted to tropical and subtropical belts when plotted in Cambrian palaeogeographic maps. In comparison, the occurrence of the herein studied specimens of Krejciella is restricted to cold-water localities of West Gondwana. The micropalaeontological analysis of a rock sample bearing one specimen of Krejciella shows the presence of moderately preserved chitinozoans, including the zonal species Linochitina pissotensis. This taxon is, for the first time, documented from the Prague Basin and determines the Middle/Late Ordovician boundary interval of the analysed sample. The herein studied specimens of Krejciella extend the record of organic tubes produced by enteropneust hemichordates both stratigraphically and palaeogeographically to the Middle/Late Ordovician cold-water area.

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Section: Comparison Of Morphology Of Krejciella With Margaretia and A...mentioning

confidence: 99%

Putative Ordovician green alga Krejciella reinterpreted as enteropneust hemichordate tube (Czech Republic)

Fatka

Vodička

2022

Palaeontol Electron

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“…Существуют детальные монографические описания фауны и водорослей с тщательным обоснованием ярусных подразделений нижнего кембрия. Эти результаты изложены в капитальных монографиях [2,4,5,7], а также в последующих статьях [8][9][10]. Разнообразие организмов на востоке Сибирской платформы было высочайшим для раннего кембрия всего мира, поэтому перечисленные публикации послужили фактологической основой для обоснования Национального парка «Ленские Столбы» в качестве объекта Всемирного наследия, включенного в Список ЮНЕСКО [11][12][13]…”

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Features of the lithological structure of the Lower Cambrian Pestrotsvet Formation near the Oi-Muran reef massif (Yakutia)

Kolosov

2023

jour

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Cambrian sections of the Lena Pillars National Park and adjacent areas in the south-east of the Siberian platform have been the subject of paleontological-stratigraphic, lithological, facies, paleogeographic and structural-tectonic studies. In this article we provide a detailed description of the Lower Cambrian Pestrotsvet Formation in the off-reef facies near the Oi-Muran reef massif. The description is given by the coastal outcrops of the Lena River above Sinsk village: 27 “Bachyk” (left bank), 43 and 44 (right bank). The exposed sediments in these outcrops belong to the off-reef shallow part of the open normal saline sedimentary basin adjacent to the Oi-Muran fragment (reef array) of the grand West Yakut Barrier Reef. We conducted a detailed description of the typical part of the section to identify the specifics of sediment accumulation in the Pestrotsvet Formation. A thin alternation of limestone laminae (with thickness varying from 3–5 to 10–20, less often 30–40 cm) was established. They are characterized by a light gray clean, pinkish-gray color, without visible impurities, and burgundy clay with abundant admixtures of ferruginous pigments. The individual intervals of the section are characterized by laminae of maroon marlstone. The rhythmic shift in the section of rocks of different compositions is the result of frequent, however, according geological standards, short-term transgressions and regressions. The origin of some laminae of comparatively pure gray and pinkish-gray limestones that contain abundant remains of cyanobacteria and algae is related to the rock-forming activity of these microorganisms. The materials presented in this article contribute to studies on the off-reef facies of the West Yakut Barrier Reef, one of the oldest reefs on Earth, which played a major role in the emergence of reef biota.

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The International Stratigraphic Chart: state of the art

Алексеев

2015

Russian Geology and Geophysics

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The International Stratigraphic Chart of the Phanerozoic is constructed by drawing lower boundaries of stratigraphic units with reference to Global Boundary Stratotype Section and Point. Some systems retain former, usually European, names of stages, whereas new sequences of stages are proposed for others, such as for Cambrian and Ordovician. The boundaries of 64 stages of 100 had been approved by the beginning of 2014. Fifty-three of these boundaries were drawn with regard to biostratigraphic criteria; one ichnological, six magnetostratigraphic, two chemostratigraphic, one impact, and one climatic criteria. Their type sections are distributed over continents as follows: thirty-nine in Europe, twelve in Asia, nine in North America, and four in Africa. They are located in 19 countries: ten in China, nine in the United Kingdom, nine in Italy, seven in the United States, six in France, five in Spain, three in Czech, two in Morocco, two in Sweden, and one in each of several more countries. Although none is in Russia, candidates are proposed for stages of the Cambrian, Carboniferous, Permian, Triassic, and Jurassic Systems. Type sections for the Sakmarian and Artinskian have already been agreed. With the present work speed, it will take two or three decades to complete the scale construction. The General Stratigraphic Scale of Russia and the International Chart gradually converge. Their similarity at the stage level is 84%. Major disagreements exist only in the Cambrian and Permian Systems.

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13th International Field Conference of the Cambrian Stage Subdivision Working Group (Siberian Platform, Western Yakutia)

Cited by 4 publications

References 0 publications

Putative Ordovician green alga Krejciella reinterpreted as enteropneust hemichordate tube (Czech Republic)

Putative Ordovician green alga Krejciella reinterpreted as enteropneust hemichordate tube (Czech Republic)

Features of the lithological structure of the Lower Cambrian Pestrotsvet Formation near the Oi-Muran reef massif (Yakutia)

The International Stratigraphic Chart: state of the art

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