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Article
The Volgian and Ryazanian in the Novoyakimovskaya-1 Well (Western Yenisei-Khatanga Regional Trough, Siberia). Article 1. The General Characteristics of the Yanov Stan Formation and Its Molluscan Biostratigraphy
This article presents data on lithology, biostratigraphy, and molluscan paleontological characteristics of the Lower Volgian–Upper Ryazanian interval of the Yanov Stan Formation obtained from the core of the N...
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Article
Ammonites of the Subfamily Collignoniceratinae in the Turonian Stage (Upper Cretaceous) in Western Siberia and Their Implications for Stratigraphy and Paleogeography
Ammonites of the subfamily Collignoniceratinae have been found in the Turonian Stage of Western Siberia. These findings have made it possible to substantiate the Collignoniceras woollgari zone in the Middle Turon...
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Article
Stratigraphic Drilling in the Northeastern Part of Laptev Sea: First Results
The Stratigraphic Drilling Project of the Russian Arctic Shelf, conducted by the Rosneft Oil Company, focuses their attention on the stratigraphic age and composition of rock complexes of the sedimentary basin...
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Article
New Data on the Structure of the Terminal Part of the Volgian Stage of the Upper Jurassic in the Reference Section near the Village of Vasilyevskoye, Yaroslavl Oblast
The study of new sections of the upper part of the Upper Volgian substage near the village of Vasilyevskoye (Rybinsk district, Yaroslavl oblast) made it possible to clarify the position of the lower boundary a...
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Article
Volcanic Tuffs and Tuffites in Jurassic–Cretaceous (Volgian–Ryazanian) Boundary Rocks of Western Siberia
Altered ash tuff and tuffite layers in the Jurassic–Cretaceous boundary rocks (Bazhenovo Formation) were studied in detail. These layers represent an interval ranging from the upper part of the middle Volgian ...
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Article
Open AccessNew Data on Stratigraphy and Distributions of Glendonites from the Carolinefjellet Formation (Middle Aptian–Lower Albian, Cretaceous), Western Spitsbergen
The Aptian deposits on Spitsbergen Island are poorly studied. Moreover, there were no published data on fossil distribution in the Aptian and Albian in the vicinity of the town of Longyearbyen. This article pr...
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Article
Infrazonal Ammonite Biostratigraphy, Paleobiogeography and Evolution of Volgian Craspeditid Ammonites
Data on the evolutionary and biogeographical differentiation features of the Volgian ammonites of the family Craspeditidae are summarized, an updated scheme of the Panboreal correlation of the terminal part of...
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Article
Coordinated Influence on the Opinions of Social Network Members
This paper studies a model of coordinated influence in a social network in which several members, called players, can jointly affect the opinions of other members, called agents, during a finite period of time...
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Article
Marine Reptiles and Climates of the Jurassic and Cretaceous of Siberia
All current data on the Jurassic and Cretaceous climates of Siberia based on isotope, paleontological, and lithological proxies are summarized. The late Pliensbachian cooling episode, early Toarcian warming, p...
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Article
The Potential of Petromagnetic Methods in Paleoecological Reconstructions Based on the Example of Jurassic Deposits (Callovian–Lower Oxfordian) of the Mikhailovtsement Section (Ryazan Region)
Based on a detailed integrated petromagnetic, lithological, and micropaleontological study of the Mikhailovtsement reference section of the Moscow syneclise (Ryazan Region), the fluctuations in the Middle Russ...
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Article
The Strontium Isotopic Composition in Glendonites of the Middle Jurassic in Northern Siberia
The Sr isotope composition in glendonites from two sections of the Middle Jurassic of Northern Siberia has been determined for the first time. Glendonite was formed by the replacement of icite by calcite durin...
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Article
The Volgidiscus Singularis Zone of the Terminal Horizons of the Volgian Stage of European Russia and Its Significance for Interregional Correlation and Paleogeography
It has been accepted until recently that a regionally developed gap corresponding to the boundary interval between the stages (equivalents of the Chetaites chetae and Volgidiscus lamplughi zones) exists betwee...
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Article
Ammonites and Stratigraphy of the Terminal Part of the Middle Volgian Substage (Upper Jurassic; Epivirgatites nikitini Zone and Its Equivalents) of the Panboreal Realm: 2. Titanites and Glaucolithites
The genera Titanites and Glaucolithites, which were previously known only from the Portlandian of Northwestern Europe are now established in Epivirgatites nikitini Zone of European Russia. The Volgian species of
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Article
New zonal and infrazonal scales for the Kimmeridgian in Westarn Siberia based on cardioceratid ammonites
It is proposed to use a Boreal scale based on the succession of cardioceratids (with the Bauhini, Kitchini, Sokolovi, and Decipiens zones) for the subdivision of the Kimmeridgian of Western Siberia instead of ...
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Article
Did an ice sheet exist in Northeast Asia at the Middle-Late Jurassic boundary? (Critical remarks on the article by Y. Donnadieu et al. (2011) “A mechanism for brief glacial episodes in the Mesozoic greenhouse”)
Results of climate modeling of Northeast Russia for the Middle-Late Jurassic boundary (Donnadieu et al., 2011) are critically reviewed. Geological and paleontological data are presented that indicate that the ...
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Article
Khetoceras (Craspeditidae, ammonoidea)—A new genus from the Volgian stage of northern Middle Siberia, and parallel evolution of Late Volgian boreal ammonites
A new ammonite genus, Khetoceras (Craspeditinae), is proposed, showing an atypical combination of features for the subfamily (arrowlike cross-section and prominent constrictions). A new subfamily Subcraspeditinae...
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Article
Probable distribution of Upper Jurassic and Lower Cretaceous deposits on the Laptev Sea shelf and their petroleum resource potential
The analysis of Upper Jurassic and Lower Cretaceous marine sections developed in surrounding structures of the Laptev Sea revealed that all of them are composed of terrigenous rocks, which enclose abundant con...
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Article
Ammonites and infrazonal subdivision of the Dorsoplanites panderi zone (Volgian Stage, Upper Jurassic) of the European part of Russia
Eight biohorizons, four of which were previously distinguished in Central Poland and four new (contradictionis, pommerania, kuteki, and pilicensis), were identified in the Dorsoplanites panderi zone of the Upper ...
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Article
Biohorizons as infrazonal biostratigraphic units: An attempt to refine the Jurassic stratigraphy based on ammonites
The biohorizons (faunal horizons) as infrazonal units are the smallest correlatable biostratigraphic units. Their main features are: (1) potential indivisibility based on taxonomic differentiation of guide fos...
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Article
Latitudinal gradient of taxonomic richness of ammonites in the Kimmeridgian-Volgian in the Northern Hemisphere
The latitudinal gradient of taxonomic richness (LGTR) of Kimmeridgian and Volgian ammonite genera of the Northern Hemisphere is evaluated, and the LGTR evaluation methods and factors influencing LGTR are discu...
