Dinoflagellate cysts and microforaminifera of the Lower Cretaceous Yatria River section, Subarctic Ural, NW Siberia (Russia). Biostratigraphy, palaeoenvironmental and palaeogeographic discussion

Lebedeva, N. K.; Nikitenko, B.L.

doi:10.1080/00173139908559222

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…Nøhr-Hansen et al 2019), the Barents Sea (Århus et al 1990;Smelror et al 1998;Smelror & Dypvik, 2005;Smelror & Dypvik, 2006;Kairanov et al 2018), Arctic Norway (Løfaldi & Thusu, 1976;Bjaerke, 1978;Thusu, 1978;Århus et al 1986, 1990Århus, 1991;Grøsfjeld, 1991;Hurum et al 2016b;Smelror & Larssen, 2016;Smelror et al 2018;Hammer et al 2018;Rakociński et al 2018;Grundvåg et al 2019) and Arctic Russia (Smelror, 1986;Lebedeva & Nikitenko, 1999;Riding et al 1999;Pestchevitskaya, 2007;Nikitenko et al 2008;Pestchevitskaya et al 2011). Some early Canadian studies provided dinocyst zonations (e.g.…”

Section: Previous Studies Of Lower Cretaceous Boreal Dinocyst Assemblmentioning

confidence: 99%

Dinocyst stratigraphy of the Valanginian–Aptian Rurikfjellet and Helvetiafjellet formations on Spitsbergen, Arctic Norway

et al. 2020

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In order to improve the understanding of how the high northern latitudes responded to the escalating warming which led to the middle Cretaceous super greenhouse climate, more temperature proxy records from the High Arctic are needed. One of the current obstacles in obtaining such records is poor age control on the Lower Cretaceous strata in the Boreal region. Here, we provide a biostratigraphic framework for the Rurikfjellet and Helvetiafjellet formations representing the lower part of the Lower Cretaceous succession on Spitsbergen. We also attempt to date the boundary between the Agardhfjellet and the Rurikfjellet formations. This study is based on dinoflagellate cysts (dinocysts) from three onshore cores (DH1, DH2 and DH5R) and three outcrop sections (Bohemanflya, Myklegardfjellet and Ullaberget). Relatively abundant and well-preserved dinocyst assemblages from the Rurikfjellet Formation date this unit as early Valanginian – early Barremian. The dinocyst assemblages from the Helvetiafjellet Formation are significantly impoverished and are characterized by reworking, but collectively indicate a Barremian–Aptian age for this formation.

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Section: Previous Studies Of Lower Cretaceous Boreal Dinocyst Assemblmentioning

confidence: 99%

Dinocyst stratigraphy of the Valanginian–Aptian Rurikfjellet and Helvetiafjellet formations on Spitsbergen, Arctic Norway

et al. 2020

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“…The Upper Volgian and the Lower Berriasian are represented by grey sandy siltstone and silty claystone of the Fedorov and Khorasoim Formations respectively. The J/K boundary is located at the top of the Chetaites chetae Zone on the basis of ammonites (Golbert et al 1972;Lebedeva & Nikitenko 1999) (Fig. 2).…”

Section: Materials and Geological Settingmentioning

confidence: 99%

Uppermost Jurassic and lowermost Cretaceous dinocyst successions of Siberia, the Subarctic Urals and Russian Platform and their interregional correlation

Pestchevitskaya¹,

Lebedeva²,

Ryabokon³

2011

Geologica Carpathica

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Uppermost Jurassic and lowermost Cretaceous dinocyst successions calibrated against ammonite and foraminiferal zones were studied in five sections from North Siberia, the Subarctic Urals and the Russian Platform. Together with analysis of published palynological material on additional contemporaneous sections from the Russian Platform, our research provides a reliable regional correlation. The obtained biostratigraphic results are compared to palynological data from different regions of Europe, America, Australia and Antarctica using the method of first/last appearances of selected key species and evolutionary trends of dinocyst floras. Four correlative levels are defined in the middle parts of the Volgian and Berriasian and near their tops providing interregional correlation of dinocyst successions. These levels range within 1-1.5 ammonite zones as the first/last appearances of some key species have minor stratigraphic shifts in different sections that may be related to migration processes or to a different understanding of the stratigraphic position of ammonite zones.

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Quantitative biostratigraphical ranges of some late Cenozoic species of the dinoflagellate genusSpiniferitesand taxonomic considerations

Londeix

2018

Palynology

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A new quantitative biostratigraphical method, based on an 'index of stratigraphical abundance' (ISA), has been used to refine the stratigraphical range of 50 dinoflagellate cyst taxa. Most of these correspond to Quaternary representatives of Achomosphaera or Spiniferites. Some extinct taxa are also discussed when their morphology is close to that of recent species (e.g. Spiniferites lenzii, S. twistringiensis and S. pseudofurcatus), as well as some species possibly related to the motile Gonyaulax spinifera complex. The ISAs of S. mirabilis and S. hyperacanthus are similar, as well as for S. elongatus and S. sphaericum. Although initially presumed as indicating morphotypes of a same taxon, it seems rather that the ISAs similarites must be interpreted as an indication of close ecological preferences. The emergence of forms of Spiniferites with low to absent septa appears relatively late (compared to the range of the genus), but the first occurrence of intergonal processes is relatively early, indicating that it is probably a character deeply rooted into the generic genome. The previously calculated phylogeny of some Gonyaulax motile cells shows a different tree pattern than the stratigraphical first appearance succession of their presumed cyst equivalents.

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Dinoflagellate cysts and microforaminifera of the Lower Cretaceous Yatria River section, Subarctic Ural, NW Siberia (Russia). Biostratigraphy, palaeoenvironmental and palaeogeographic discussion

Cited by 4 publications

References 12 publications

Dinocyst stratigraphy of the Valanginian–Aptian Rurikfjellet and Helvetiafjellet formations on Spitsbergen, Arctic Norway

Dinocyst stratigraphy of the Valanginian–Aptian Rurikfjellet and Helvetiafjellet formations on Spitsbergen, Arctic Norway

Uppermost Jurassic and lowermost Cretaceous dinocyst successions of Siberia, the Subarctic Urals and Russian Platform and their interregional correlation

Quantitative biostratigraphical ranges of some late Cenozoic species of the dinoflagellate genusSpiniferitesand taxonomic considerations

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