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Abstract <p>Boreal radiolarians of the Upper Jurassic (Oxfordian, Kimmeridgian and Volgian) and of the lower part of Lower Cretaceous (Ryazanian and Valanginian) of Russia are known from the territories of the Eastern European Craton, Timan-Pechora Basin, Western Siberian Basin and northern periphery of the Siberian Craton. Radiolarian assemblages of this stratigraphic interval are characterized by dominance of high-latitude taxa (genera <i>Parvicingula</i> and <i>Praeparvicingula</i> of the family Parvicingulidae) and common presence of the typically boreal family Echinocampidae (genera <i>Echinocampe</i>, <i>Nordvikella</i> and <i>Arctocapsula</i>). The genus <i>Pantanellium</i> is present in the Kimmeridgian of Eastern European Craton and Timan-Pechora Basin. This genus is represented by the <i>P. meraceibaense</i> a group of species, that can spread to southern boreal areas. Previous reports of the presence of the subfamily Vallupinae, which is typical of low paleolatitudes, cannot be confirmed. Radiolarian assemblages of the Boreal Upper Jurassic and lower part of Lower Cretaceous show considerable taxonomic changes through the succession and can therefore be used in stratigraphy.</p>

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Upper Jurassic and Lowermost Cretaceous Boreal Radiolarian Assemblages of Russia and Their Paleobiogeographic and Stratigraphic Significance: a Review

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  • 发表日期：

    2025年4月30日

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  • N. Y. Bragin,
  • L. G. Bragina

摘要

Abstract

Boreal radiolarians of the Upper Jurassic (Oxfordian, Kimmeridgian and Volgian) and of the lower part of Lower Cretaceous (Ryazanian and Valanginian) of Russia are known from the territories of the Eastern European Craton, Timan-Pechora Basin, Western Siberian Basin and northern periphery of the Siberian Craton. Radiolarian assemblages of this stratigraphic interval are characterized by dominance of high-latitude taxa (genera Parvicingula and Praeparvicingula of the family Parvicingulidae) and common presence of the typically boreal family Echinocampidae (genera Echinocampe, Nordvikella and Arctocapsula). The genus Pantanellium is present in the Kimmeridgian of Eastern European Craton and Timan-Pechora Basin. This genus is represented by the P. meraceibaense a group of species, that can spread to southern boreal areas. Previous reports of the presence of the subfamily Vallupinae, which is typical of low paleolatitudes, cannot be confirmed. Radiolarian assemblages of the Boreal Upper Jurassic and lower part of Lower Cretaceous show considerable taxonomic changes through the succession and can therefore be used in stratigraphy.