Ruslan Kutygin | North-Eastern Federal University, NEFU (original) (raw)

Papers by Ruslan Kutygin

In the Tuorasis Formation section of the lower reaches of Lena River (Northern Verkhoyansk Region... more In the Tuorasis Formation section of the lower reaches of Lena River (Northern Verkhoyansk Region, Kharaulakh ridge) were first found of the goniatite Svetlanoceras, defined as S. strigosum (Ruzhencev), which had previously been known only in the Southern Urals. Kharaulakh Svetlanoceras were found at the same level with numerous Bulunites mezhvilki Andrianov (the species-index of the same ammonoids Beds of the Lower Permian in the Verkhoyansk Region) and with single Eoasianites maximovae (Andrianov). The finds of S. strigosum indicates migration of the South Ural Ammonoids in the Kharaulakh subzone of the Verkhoyansk water area of Khorokytian age and suggests the Asselian age of the Khorokytian Ammonoids Asociatian, which characterizes the Bulunites mezhvilki Beds of the Khorokytian Horizon in the Verkhoyansk Region.

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Chemical composition of different types of the sedimentary rocks of Serdzhakhian Formation and Im... more Chemical composition of different types of the sedimentary rocks of Serdzhakhian Formation and Imtandzhian Formation from the Lower—Middle Carboniferous Western Verkhoyansk (Chechim-Bal River basin) is studied for the first time. Volcanogenic material of dacite composition is identified in all types of the rocks application of petrochemical criteria allowed the identification of tuffs and tephroides among volcanites.

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Beds with ammonoids are recognized as a result of the study of goniatitids and prolecanitids from... more Beds with ammonoids are recognized as a result of the study of goniatitids and prolecanitids from the Nyut, Khuren, and Ayan_Yuryakh in the Okhotsk Region. Beds with Neopronorites tenkensis, assigned to the Upper Artinskian Substage, correspond to the upper part of the Echian Horizon of the Verkhoyansk Region. Beds with Paragastrioceras–Baraioceras characterize the middle part of the Kungurian Stage and correlate with the upper sunhorizon of the Tumarian Horizon of the Verkhoyansk Region. Beds with Sverdrupites harkeri correspond to a biostratigraphic subdivision with the same name widely distributed in the Vekhoyansk-Kolyma Region and assigned to the Roadian Stage. The new species Neopronorites tenkensis is described.

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The major morphological characters of the genus Uraloceras are summarized. It is shown that the e... more The major morphological characters of the genus Uraloceras are summarized. It is shown that the early evolution history of the genus was dominated by the U. simense group, which split in the Mid-Sakmarian into two subgroups: with moderately evolute and moderately involute shells. U. burtiense, which was initial in the evolution of the major phylogenetic lineage in the Artinskian, represented a separate morphogenetic branch of the early Uraloceras species.

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In the second half of the Asselian and first half of the Sakmarian the Verkhoyansk and Omolon amm... more In the second half of the Asselian and first half of the Sakmarian the Verkhoyansk and Omolon ammonoid assemblages were formed, in which local elements (Bulunites, Kolymoglaphyrites) were dominated. Since the beginning of large Echian transgression at the turn of the early and late Sakmarian almost complete taxonomic regeneration of the Ammonoids happened due to a wide expansion of the Ural elements Uraloceras, Paragastrioceras, Andrianovia, Tabantalites) well adapted to the local environmental conditions. In the Early Artinskian the period of maximum sea warming brief invasion of the Ural biota (Neoshumardites) in the Western Verkhoyansk region took place. In the middle of the Artinskian a new ammonoid assemblage formed in the Verkhoyansk basin mostly from local elements (Eotumaroceras). The Verkhoyansk ammonoid area constantly expanded, and the assemblage transformed first to the Verkhoyansk-Okhotsk assemblage (Late Artinskian), and then to Verkhoyansk-Omolon assemblage (Kungurian – Roadian). Thus a succession of ammonoid associations took place with domination of genera of a local origin, but spread widely beyond Northeast Asia (Tumaroceras, Neouddenites, Biarmiceras, Epijuresanites, Sverdrupites). The Permian Verkhoyansk-Omolon ammonoid assemblage disappeared at the Late Roadian.

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Problems in the Lower Permian correlations of Northeastern Asia are briefly summarized. It is est... more Problems in the Lower Permian correlations of Northeastern Asia are briefly summarized. It is established that the Asselian-Sakmarian ammonoid assemblages of the Verkhoyansk Region and the Omolon Massif were highly endemic, which complicates direct correlations between these regions. The oldest taxa in common was Uraloceras omolonense Bogoslovskaya et Boiko, the appearance of which in the sections of Northeastern Asia allows recognition of the Uraloceras omolonense Zone.

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The most ancient representative of Permian Inoceramus_like bivalves, Aphanaia kletzi sp. nov., fr... more The most ancient representative of Permian Inoceramus_like bivalves, Aphanaia kletzi sp. nov., from the Upper Sakmarian of the Western Verkhoyansk Region (northeastern Asia) is described. It is established for the first time that the first kolymiids appeared in the northeastern Asian basins in the latter half of the Sakmarian rather than at the end of the Artinskian. The age of the record is reliably dated by the ammonoid genera Uraloceras and Neoshumardites.

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Jurassic strata are widespread through Arctic Siberia and host oil and gas fields. However, in mo... more Jurassic strata are widespread through Arctic Siberia and host oil and gas fields. However, in most cases, the geology of such vast areas still remains unexplored, and study of the Jurassic stratigraphy and reconstructions of geologic history are possible only through analysis of sediment cores. In this connection, there is a clear need for detailed studies of microfaunas (foraminifera, ostracods) and palynomorphs (dinocysts, spores, and pollen). The studied reference section of the Upper Jurassic and Lower Cretaceous is located on the left side of Anabar Bay of the Laptev Sea (Nordvik Peninsula, Cape Urdyuk-Khaya). An uninterrupted and continuous section from the Upper Oxfordian to the Lower Valanginian is exposed in coastal cliffs and consists mainly of silty clay deposits with abundant macro- and microfossils. Integrated field studies (biostratigraphy, lithostratigraphy, sedimentology) allow a more detailed characterization of the regional geologic framework. A detailed subdivision of the section is based on the systematic composition of ammonites from Upper Oxfordian and Kimmeridgian deposits. Several foraminiferal zones of the Upper Oxfordian and Lower Volgian are defined, and some of them are denfined for the first time. The distribution of ostracods in the section is analyzed for the first time. The section is also studied using palynological analysis, that results in its detailed subdivision on palynological data and recognition of two sequences of palynostratigraphic units. The integrated stratigraphy is used to establish the precise position of stage and substage boundaries. The continuity of the section is defined based on micropaleontological and palynological data.

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