Abstract Analysis of the distribution of ostracods from the Armkhi Formation (Callovian) of the Tsudakhar section (Central Dagestan) enabled the identification of a stratigraphic sequence of six assemblages determined by paleoecological conditions and the first ostracod-based biostratigraphic zonation of the Callovian of Dagestan. Beds with Pleurocythere khapissovi and the Neurocythere cruciata intermedia

Abstract The results of studies of the Late Pleistocene and Holocene spore–pollen spectra and the microtheriofauna of loose deposits of four cave localities located in the Shchuger and Kozhym river basins within the territory of the Yugyd-Va National Park on the western slope of the Subpolar Urals are discussed. Assessment of the age of sediments from the karst cavities was based on the data of AMS

Abstract The rich assemblage of Early Ediacaran (Early Vendian) acanthomorphic palynoflora (ECAP) was recognized in the middle part of the thick (2.2–2.7 km) clayey–carbonate sequence of the postglacial sediments of the Dal’nyaya Taiga Group (Ura Uplift). The degree of preservation of microfossils is determined by the instantaneous rate of their burial within the narrow facies zones of a deep-water

Abstract New radiolarian data from the type section of the upper Albian Crolanium triangulare Zone located near the settlement of Mar’ino (southwestern Crimea) are reported. The Crolanium triangulare Zone has been traced in the additional section near the settlement of Kirpichnoye; radiolarians have been studied and analyzed in this section for the first time. Thirty-seven species earlier unknown in

Abstract The Neoarchean–Early Paleoproterozoic section of the Eastern Sarmatia Kursk Block contains different formations: terrigenous-carbonate (Ignateevo Formation), terrigenous (Stoilo Formation), and banded iron (Korobki Formation). The Kursk Block sequences have obvious similarities to the coeval terrigenous-carbonaceous-ferriferous formations of the Kaapvaal and Pilbara cratons. The Ignateevo

Abstract An abundant collection of bivalves, belonging to the stratigraphically important genus Retroceramus, has been described for the first time from the Bajocian‒Bathonian beds of the Timan-Pechora region, exposing along the Izhma River and its right tributary, the Dreshchanka River. Totally 7 taxa were found, among which 4 were identified to a species level (and 2 of them are new taxa), and other

Abstract On the basis of the analysis of literature and cartographic materials, our field observations, results of U–Pb isotope dating of zircons, and examination of paleobotanical collections, it was established that the “Mesophytic” Buor-Kemus fern–gymnosperm flora existed in Eastern Chukotka in the Late Cretaceous longer than in other regions. The volcanics of the Nyrvakinot sequence are partly

Abstract— Data on the mineral, chemical, and Nd isotope composition of the highly aluminiferous schists of the Gorlyk Formation in the Tunka Bald Mountains of the Eastern Sayan Range, which are correlated with the Vendian–Cambrian sedimentary cover deposits in the central part of the Tuva–Mongolian Microcontinent, are presented. The highly aluminiferous sediments were deposited on the distal shelf

Abstract— The results of geological, geochemical, Sm–Nd isotopic geochemical studies of metamorphic rocks of the Djagdagle Formation and U–Pb geochronological studies of its zircons are presented. In correlation schemes of geological complexes of the Bureya Terrane, this formation is the oldest (conditionally, Late Archean) amid other formations of the terrane; thus, it is considered its basement.

Abstract— Oxfordian radiolarians from core of boreholes drilled on Vorobyovy Gory (Moscow), from the Podosinki Subformation of the Chulkovo Formation (upper Callovian–lower Oxfordian), Podmoskovnaya Formation (middle–upper Oxfordian), Kolomenskoe Series (upper Oxfordian), and Makariev Formation (upper Oxfordian–lower Kimmeridgian) are studied for the first time. The studied radiolarian assemblages

Abstract A list and short description of the middle Callovian cardioceratid genera from Northern Siberia are given. These are Rondiceras and Stenocadoceras with specified diagnosis and also Bryocadoceras and Streptocadoceras, which were described earlier as subgenera of Cadoceras Fischer. The middle Callovian of Northern Siberia (section 503 at Bolshoy Begichev Island) is divided into the lower Rondiceras

Abstract The Campanian and Maastrichtian radiolarian assemblages are known from many regions of the Tethyan Superrealm. Unfortunately, only some of them are reliably dated and completely studied as paleontological assemblages. The analysis of evolution of radiolarians is based on Campanian to Maastrichtian assemblages from Crimea, Cyprus, and Serbia properly dated and studied in detail with addition

Abstract The results of the study of the structure of buried soils of Marine Isotope Stage (MIS) 3 on the Kolyma Lowland and of the analysis of microphytofossils from these soils are given. The data of the spore-pollen and phytolith analyses confirm the similarity of the natural conditions for the formation of buried soils and the tundra aspect of reconstructed landscapes under a progressive decrease

Abstract— This work presents the results of integrated micropaleontological and lithogeochemical analysis of Upper Oligocene continental deposits of the Turtas Formation from the Zyryanskaya-1 borehole (southwestern part of the Tyumen Region, Western Siberia). The predominance of freshwater planktonic diatoms at the subordinate significance of benthic species, as well as the presence of gemmuloscleres

Abstract The Paleozoic granitoids of the Urgamal pluton in the crystalline basement of the northwestern part of the Dzabkhan Terrain are considered. The age of these granitoids, 463 ± 2 Ma, was determined by the U–Pb method (ID-TIMS). The Urgamal pluton is located on the border of the Dzabkhan Terrain with the Early Caledonian formations of the Ozernaya Zone. The pluton was emplaced after the the Dzabkhan

Abstract Fusulinids from the Emarat Formation of the Central Alborz are studied to establish species belonging to such genera as Schubertella, Biwaella, Triticites, Tumefactus?, Pseudoschwagerina, Zellia, and Praepseudofusulina. The new species Pseudoschwagerina gadukensis is described. It is supposed that the origin of early Asselian and later Pseudoschwagerina and Zellia was polyphyletic, thus involving

Abstract Analysis of taxonomically significant trait variability in the genus Arcticoceras (Cardioceratide, Arctocephalitinae) enables the assignment of most species of this genus (including A. harlandi) identified earlier and characteristic of the lower Bathonian to the group of synonyms of A. ishmae. Invalidity of the genus Greencephalites is substantiated, and it is proposed to consider the species

Abstract A study of the composition and the age (U–Th–Pb method for zircon, SIMS) of the Neoarchean volcanic rocks of the Khedozero-Bolshozero greenstone structure of Central Karelia was carried out. The volcanogenic sequence of this structure is composed primarily of dacites and andesite-dacites, and to a lesser extent of andesites and andesite basalts. The ultra-felsic volcanic rocks, previously

Abstract— The biostratigraphy of the lower boundaries of the Atdabanian Stage of the General Stratigraphic Scale of Russia and Stage 3 of the International Chronostratigraphic Chart is discussed. It is generally accepted that the first appearance of trilobites is the main characteristic of these stages. The difficulties in selecting the correlation level for the lower boundary of Stage 3 on the basis

Abstract— The substantiation of age and formation conditions of the Yamato Rise sedimentary cover, the largest rise in the Sea of Japan, is presented. Six complexes of sedimentary deposits of different age and genesis were identified based on the results of petrographic and micropaleontological analysis. Complex 1 (continental) of tuffaceous–sedimentary deposits contains numerous freshwater diatoms

Abstract— The late Albian–early Turonian Grebenka flora is one of the most representative mid-Cretaceous floras of Northeast Russia. However, the stratigraphic position of the Grebenka beds relative to plant-bearing deposits of similar age is still debatable. It is shown that the Salamikha volcanogenic sequence, bearing the Buor-Kemyuss plant fragments, is the most probable stratigraphic analog of

Abstract— The results of palynological study of the middle–upper Eocene interval of the Kheu reference section are presented. The dinocyst zones such as Enneadocystaarcuata, Costacystabucina, Enneadocystapectiniformis, Rhombodiniumdraco, Reticulatosphaeraactinocoronata, and Talladinium? angulosum were recognized in the studied part of the section. Based on the first order calibrations with calcareous

Abstract— The comprehensive geochemical and isotopic-geochronological study of Early Proterozoic volcanic rocks in structure of the Polmak–Pechenga–Imandra–Varzuga belt and dikes and sills of the Murmansk and Kola–Norwegian terranes is conducted. Abundant swarms of mafic dikes (2.06–1.86 Ga) are established in the northwestern frame of the belt, including swarms of metadolerites (2060 ± 6 Ma), ferropicrites

Abstract Radiolarians and planktonic foraminifera were studied from the group of sections of the Upper Cretaceous lithographic limestones in the Struganik Village region (Western Serbia). The deposits studied were formed in the local basin that was surrounded by a carbonate platform and was characterized by low-energy conditions of sedimentation. The deposits are represented by micritic limestones

Abstract The results of palynomorph biofacies analysis of the Lower and Middle Jurassic deposits of Western and Eastern Siberia are presented. A comprehensive study of different groups of palynomorphs (spores and pollens, dinoflagellate cysts, acritarchs, prasinophytes, Zygnematales algae, etc.) was carried out. Detailed analysis of the distribution of separate taxa and quantitative proportions of

Abstract The information on the Late Palaeozoic deposits of the New Siberian Islands is essential to clarify the palaeogeography of the surrounding Arctic Region and to quest the original location of the New Siberian continental block prior to the Amerasian ocean opening. The best Upper Palaeozoic section of the islands, located in the western part of the Kotel’ny Island (Tas-Ary Peninsula), was examined

Abstract The most stratigraphically representative section of Turonian–Coniacian in the right-bank part of the Volga region is found at the Kamennyi Brod-1 section (Olkhovka district of Volgograd oblast). The subdivision of carbonate rocks into zones is based on the complexes of benthic foraminifera and other accompanying groups of invertebrates. Regressive-transgressive tendencies in the evolution

Abstract The Early and Middle Jurassic plant communities of northern Iran were studied. It was observed that they both bore strong similarities. Communities with arthrophyte dominance were located in lowlands. The arborescent layer of the upper parts of the slopes and near-valley surfaces (flat interfluve?) was represented by Pityophyllum; the arborescent layer of the humid lower parts of the slopes

Abstract For the first time, sections of the Upper Miocene Ishim Formation in the south of Tyumen oblast near the villages of Pyatkovo, Masali and Bigila were thoroughly studied by the palynological method. A series of mineralogical analyses of these sediments and radiocarbon analysis of the Quaternary sediments overlying the Ishim Formation were carried out. Four palynological assemblages (PA) were

Abstract— The results of palynological and micropaleontological studies of the Upper Cretaceous–Cenozoic strata penetrated by Boreholes 23 and 19 of the Aleiskaya area (Altai krai) are presented. The obtained data allowed us to substantiate the age of the deposits, make suggestions concerning their depositional environment, and to clarify the subdivision of geological section into formations. Two palynological

Abstract The majority of fossil floras from Cretaceous volcanogenic rocks of Northeast Russia considerably differ in taxonomy from the coeval paleofloras of coastal lowlands. In order to explain the peculiarities of their formation, we used the data on the modern vegetation dynamics for volcanic plateaus of Central Kamchatka. It is shown that there was virtually no erosion where paleofloras of the

Abstract In the present paper we describe and discuss belemnite finds from the basal part of the middle Jurassic sequence at the southwest of the Republic of Tatarstan (Tetyushi district). The belemnites were collected from the outcrops located along a shoreline of the Kuybyshevskoye reservoir (Volga river) between the place Tarkhanovskaya pristan’ and the former village Dolinovka. These belemnites

Abstract— The results of palynological study of the mid-upper Eocene sediments of the Aktumsuk key-section (Ustyurt Plateau, Uzbekistan), calibrated with nannoplankton data, are presented. Dinocyst stratigraphical distribution permitted to recognize five Dinoflagellate Zones from the Peri-Tethys zonation: Costacysta bucina, Enneadocysta pectiniformis, Rhombodinium draco, Rhombodinium perforatum, and

Abstract— This paper presents new data on the biostratigraphy and sedimentology of upper Viséan and Serpukhovian deposits (Lower Carboniferous) from boreholes in the southeast of the East European Platform around the Sol-Iletsk Swell (Orenburg oblast). Using rock lithology, sublatitudinal facies zones are recognized in the studied area. The deposits are represented by open shallow shelf facies, up

Silicified shallow-water marine carbonate deposits of the Proterozoic Debengda Formation (the Olenek Uplift, northeastern Siberia) contain well preserved microfossils. One or two distinct assemblages consists only of filamentous Siphonophycus microfossils, which are presumably the extracellular sheaths of hormogonium cyanobacteria. The other is dominated by coccoidal microfossils, first by the entophysalidacean

Abstract— The Pb–Pb isotope age and the Sr isotope signature of the Upper Riphean sedimentary limestones from the south of the Yenisei Range on the western margin of the Siberian Craton were obtained. The Pb–Pb age of carbonate deposits of the Dadykta Formation of the Tungusik Group in the Kamenka facial zone in the east of the Yenisei Range is 1020 ± 20 Ma. The Pb–Pb age of limestone of the Gorevka

Abstract The U and Pb contents and C, O, and Pb isotopic compositions are determined for dolomites of the Billyakh Group (6 and 15 samples of the Kotuikan and Yusmastakh formations, respectively), which composes the upper part of the Riphean section of the Anabar Uplift of North Siberia. The δ13С and δ18O values of dolomites vary from –3.0 to +0.8‰ PDB and from 23.7 to 27.3‰ SMOW, respectively, and

Abstract— Similarity analysis of the taxonomic composition of the 13 major localities for Vendian macrofossils worldwide is performed using the Ochiai coefficient. There are two distinct subgroups among shallow-marine localities. The first subgroup includes Australia, the southeastern White Sea area, Podolia, India, and the Urals (degree of similarity 0.16–0.38). The second subgroup includes localities

Abstract— Two episodes of Mesoarchean magmatism (ca. 2.95 and 3.03 Ga) have been recognized within the Kursk domain of Eastern Sarmatia. They led to the formation of the Saltyki granitoid complex, which is similar in composition to the granitoids of the typical tonalite–trondhjemite–granodiorite (TTG) associations of Archean cratons. These episodes correlate well with the previously determined emplacement

Abstract— This work presents the results of the mineralogical, crystallochemical, and geochronological study of globular phyllosilicates (GPS) of glauconite–illite series from the Bakeevo Formation. This formation is the basal member of the Vendian Asha Group in the Southern Urals. The monomineral GPS fractions representing the globules varying in size and density are composed of Al-glauconite and

Abstract The results of U–Th–Pb geochronological (LA-ICP-MS) and Hf isotope (LA-MC-ICP-MS) studies of detrital zircons from sandstones and also the results of Nd isotope studies of whole rocks from the tillite-bearing Maikhan-Uul Formation of the Tsagaan-Olom Group of the shelf cover of the southeastern part of the Dzabkhan terrane of the Central Asian Orogenic Belt are considered. The obtained data