The Upper Bajocian-Lower Bathonian boundary section in the outskirts of Saratov: Molluscan characteristics and biostratigraphy

Митта, В. В.; Захаров, В. А.; Барсков, И. С.; Seltser, V. B.; Ivanov, Alexey V.

doi:10.1134/s086959381105008x

Cited by 12 publications

(5 citation statements)

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“…, Sasonova & Sasonov, 1967 ; Mitta et al, 2004 ; Ippolitov, 2018a ; Ippolitov & Desai, 2019 ). Unfortunately, there are no records of thalattosuchians from the lower Bathonian of Central Russia, which is relatively well-studied, probably due to the prominent cold-water inflow this time from the Arctic, as can be supposed from the observed invertebrate immigration from high latitudes ( Mitta et al, 2004 ; Ippolitov, 2018a ).…”

Section: Geological Settings and Paleogeographymentioning

confidence: 97%

“…By the beginning of the Bathonian, the marine transgression had reached the central regions of the East European Plain, forming a short-lived epicontinental marine seaway that connected the Tethys Ocean with the Arctic seas ( e.g. , Sasonova & Sasonov, 1967 ; Mitta et al, 2004 ; Ippolitov, 2018a ; Ippolitov & Desai, 2019 ). Unfortunately, there are no records of thalattosuchians from the lower Bathonian of Central Russia, which is relatively well-studied, probably due to the prominent cold-water inflow this time from the Arctic, as can be supposed from the observed invertebrate immigration from high latitudes ( Mitta et al, 2004 ; Ippolitov, 2018a ).…”

Section: Geological Settings and Paleogeographymentioning

confidence: 99%

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Thalattosuchian crocodylomorphs from European Russia, and new insights into metriorhynchid tooth serration evolution and their palaeolatitudinal distribution

Young

Zverkov

Arkhangelsky

et al. 2023

PeerJ

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From the Middle Jurassic to the Early Cretaceous, metriorhynchid crocodylomorphs inhabited marine ecosystems across the European archipelago. Unfortunately, European metriorhynchids are only well known from Germany, France, and the UK, with the Eastern European fossil record being especially poor. This hinders our understanding of metriorhynchid biodiversity across these continuous seaways, and our ability to investigate provincialism. Here we describe eleven isolated tooth crowns and six vertebrae referable to Metriorhynchidae from the Callovian, Oxfordian, Volgian (Tithonian), and Ryazanian (Berriasian) or Valanginian of European Russia. We also describe an indeterminate thalattosuchian tooth from the lower Bajocian of the Volgograd Oblast, the first discovery of a marine reptile from the Bajocian strata of European Russia. These rare fossils, along with previous reports of Russian thalattosuchians, indicate that thalattosuchians have been common in the Middle Russian Sea since it was formed. Palaeolatitude calculations for worldwide metriorhynchid-bearing localities demonstrate that the occurrences in European Russia are the most northern, located mainly between 44–50 degrees north. However, metriorhynchids appear to be rare at these palaeolatitudes, and are absent from palaeolatitudes higher than 50°. These observations support the hypothesis that metriorhynchids evolved an elevated metabolism but were not endo-homeothermic, especially as endo-homeothermic marine reptiles (ichthyosaurs and plesiosaurs) remained abundant at much higher palaeolatitudes.

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Section: Geological Settings and Paleogeographymentioning

confidence: 97%

Section: Geological Settings and Paleogeographymentioning

confidence: 99%

Thalattosuchian crocodylomorphs from European Russia, and new insights into metriorhynchid tooth serration evolution and their palaeolatitudinal distribution

Young

Zverkov

Arkhangelsky

et al. 2023

PeerJ

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“…In addition, the age of belemnites from the Sokur Quarry is considerably older that the range of P. subrediviva, which appears in the Boreal Jurassic sections in the Upper Bathonian (meLedina et al 1998;dzyuba 2004;Shurygin et al 2000Shurygin et al , 2011. However, some P. optima rostra from the Sokur Quarry differ from typical representatives of P. Problems of generic assignment of rostra to Nannobelus were previously discussed in detail (barSkov in mitta et al 2004(barSkov in mitta et al , 2011naLnjaeva in meLedina et al 2009). These are small, short and robust, conical rostra with an acute apex.…”

Section: Lithological and Palaeontological Characteristics Of The Sokmentioning

confidence: 98%

Biostratigraphy and sedimentary settings of the Upper Bajocian-Lower Bathonian in the vicinity of Saratov (Central Russia)

Митта¹,

Kostyleva²,

Dzyuba³

et al. 2014

njgpa

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This paper presents the results of a detailed study of the Bajocian-Bathonian sections in the "Sokur" Quarry near the city of Saratov and of a borehole drilled in the same quarry. The study of these Bajocian-Bathonian boundary beds, unique for the Boreal-Tethyan ecotone, offers a solution to the much-debated problem of the Middle Jurassic Boreal-Tethyan correlation. The Bajocian-Bathonian boundary beds of this section contain both Peri-Tethyan and Boreal ammonite species, allowing recognition of the Boreal ammonite zones and associated "Boreal" Bathonian zones based on belemnites, bivalves, and foraminifers. This integrated biostratigraphy allows correlation of the Late Bajocian-Early Bathonian boundary interval of the Boreal Jurassic scale with the Submediterranean standard scale.E eschweizerbart_xxx 96 V. Mitta et al.

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“…The Middle Jurassic epoch was a time of distribution of marine environments over the East European Platform. A transgression of shallow epicontinental seas far into its territory led to the formation of the Middle Russian Sea, which connected the Boreal seas and Tethys Ocean for a short time in the Early Bathonian [54][55][56][57][58][59][60]; then, after some regression during the mid-Bathonian, the Boreal-Tethys connection through this sea resumed in the course of a new cycle of transgression since the beginning of the Callovian [60][61][62][63][64][65]. Additionally, since the earliest Callovian, the Middle Russian Sea became connected to the seas of Central and Western Europe via the Dnieper-Donets basin and the sub-latitudinal Pripyat (Brest) Strait (Figure 1).…”

Section: Paleogeographic Position Of the Regionmentioning

confidence: 99%

Callovian Marine Reptiles of European Russia

Zverkov,

Arkhangelsky,

Gulyaev

et al. 2024

Diversity

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Our knowledge of marine reptiles of the Callovian age (Middle Jurassic) is majorly based on the collections from the Oxford Clay Formation of England, which yielded a diverse marine reptile fauna of plesiosaurians, ichthyosaurians, and thalattosuchians. However, outside of Western Europe, marine reptile remains of this age are poorly known. Here, we survey marine reptiles from the Callovian stage of European Russia. The fossils collected over more than a century from 28 localities are largely represented by isolated bones and teeth, although partial skeletons are also known. In addition to the previously described rhomaleosaurid and metriorhynchids, we identify pliosaurids of the genera Liopleurodon and Simolestes; cryptoclidid plesiosaurians, including Cryptoclidus eurymerus, Muraenosaurus sp., and cf. Tricleidus, and ophthalmosaurid ichthyosaurians, including the iconic Ophthalmosaurus icenicus. These findings expand the ranges of several Callovian marine reptile taxa far to the Eastern Europe, and support the exchange of marine reptile faunas between Western and Eastern European seas in the middle to late Callovian. However, some specimens from the lower Callovian of European Russia show differences from typical representatives of the middle Callovian Oxford Clay fauna, possibly representing the earlier stages of evolution of some of these marine reptiles not yet recorded in Western Europe or elsewhere.

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The Upper Bajocian-Lower Bathonian boundary section in the outskirts of Saratov: Molluscan characteristics and biostratigraphy

Cited by 12 publications

References 1 publication

Thalattosuchian crocodylomorphs from European Russia, and new insights into metriorhynchid tooth serration evolution and their palaeolatitudinal distribution

Thalattosuchian crocodylomorphs from European Russia, and new insights into metriorhynchid tooth serration evolution and their palaeolatitudinal distribution

Biostratigraphy and sedimentary settings of the Upper Bajocian-Lower Bathonian in the vicinity of Saratov (Central Russia)

Callovian Marine Reptiles of European Russia

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