Abstract Studies of plant communities showed that the near-basin spaces were weakly dissected in the Late Triassic of Northern Iran; tree and shrub tier communities of the slopes were the most widespread, deforestated areas were few, and the valleys were poorly developed. The stable dominants identified were as follows: Pagiophyllum peregrinum and various Podozamites for the tree stands of uplands

Abstract An integrated study of the Campanian–Maastrichtian deposits of Beshkosh Mountain (Southwest Crimea) was carried out. The finds of cephalopods and dinocysts were studied, and ichnofacies and sedimentological analyses were performed. Isotopic, paleomagnetic, and petromagnetic data were obtained for the first time. New macro- and micropaleontological data made it possible to refine the stratigraphic

Abstract Information on the taxonomic composition and stratigraphic distribution of small benthic foraminifers in the Danian–Priabonian Paleogene stages of Syria based on the analysis of V.A. Krasheninnikov’s collections is presented. The small benthic foraminiferal zones identified in the Palmyrid sections within the framework of planktonic foraminiferal zonation developed by Krasheninnikov and correlated

Abstract The Early Eocene succession of the Salt Range from base to top comprises the Nammal Formation, Sakesar Limestone and Chor Gali Formation. The Nammal Formation of Ypresian age is well exposed throughout the Salt Range. Detailed sedimentological and palaeontological analyses of the Nammal Formation were carried out, based on six stratigraphically important measured sections in the Salt Range

Abstract As a result of study of new collections of brachiopods, a zonal scheme of the Asselian–Sakmarian deposits in the Verkhoyansk region based on the phylogenetic development of Jakutoproductus is elaborated. The J. verkhoyanicus Zone is distinguished in the Khorokytian Horizon; in some sections, it may be divided into the beds with J. talchanensis and beds with J. lenensis. The succession of the

Abstract The geology and composition of Archean terrigenous sedimentary rocks of the Karelian province (Baltic Shield) are studied in order to establish their positions in the structures of greenstone belts and their role in the provenance composition. It is shown that metaterrigenous rocks from the greenstone belts of the youngest Central Karelian domain, together with intermediate-to-felsic volcanic

Abstract The Dzabkhan terrane, represented by the basement of the Tsaganolom Formation carbonate sequences referring to the Ediacaran shelf cover, was considered as an ancient cratonic fragment in the structure of the Central Asian Fold Belt. It was assumed that its sequences marked the regional unconformity between the Early and Late Precambrian deposits. However, the occurrence of the Tsaganolom

Abstract— On the basis of published and new data, the features of the history of study of radiolarians and their stratigraphic distribution in the Upper Jurassic–Lower Cretaceous Bazhenovo Regional Substage (Tithonian–Berriasian) of the West Siberian depositional basin are summarized and analyzed. A general geological characteristic of the Bazhenovo Formation is given. The previous regional schemes

Abstract— Results of U–Pb dating of detrital zircon grains from diamond-bearing sandstones of the Middle Devonian Asyvvozh Formation in the Southern Timan are presented. It was established that the sandstones do not contain zircon grains younger than the Middle Riphean. The datings of 92 zircon grains fall in the interval of 1144 ± 36 to 3090 ± 19 Ma, and the difference between the depositional age

Abstract The results of geochemical studies of Paleoproterozoic volcanic rocks in the structure of the Polmak–Pechenga–Imandra–Varzuga belt of the northeastern part of the Fennoscandian Shield are presented. Taking into account new geochronological data, the volcanic series are correlated with subvolcanic and intrusive rocks of the Murmansk and Kola–Norwegian terranes. The comparative analysis of sections

Abstract— Isotope analyses of detrital zircons from the terrigenous sequences of the Neoarchean Uraguba–Titovka greenstone belt and the Paleoproterozoic Pechenga–Varzuga and Vetreny belts, including the basal conglomerates, by the SIMS (SHRIMP-II) and LA-ICP-MS methods were performed for the first time. On the basis of the data obtained, the inception dates of the structures and the ages and lithology

Abstract— The results of petrographic, geochemical, and isotopic studies of the Neoproterozoic and Upper Paleozoic sandstones of the Eastern Taimyr complement the available data on their genesis and confirm their molassic origin. The sandstones and mudstones of the Neoproterozoic Stanovaya and Posadochnaya formations formed mostly from the erosion products of the magmatic and metamorphic complexes

Abstract— The Cenozoic marine deposits (two formations) developed in the eastern part of the Opukha–Pekulney Depression of the Koryak Upland are described. Until recently, there was scarce information about them. The lower (Retyrveem) formation is composed of dark conglomerates and sandstones with a large number of carbonate nodules and representative assemblages of bivalve and gastropod mollusks (more

Abstract In this publication, the discussion is focused on issues related to the stratigraphy and chronology of the Karama Lower Paleolithic site in the Altai Mountains in light of the article “Debatable Aspects of Initial Human Colonization of Siberia and Age of the Karama Site in the Altai Mountains” by V.S. Zykin, V.S. Zykina, and L.G. Smolyaninova published in Stratigraphy and Geological Correlation

Abstract Most of the Okhotsk–Chukotka volcanogenic belt fossil floras differ significantly in systematic composition from the floras of coastal lowlands of the adjoining Anadyr–Koryak subregion dated by faunistic remains. That is the reason why its comparison is so difficult and, accordingly, why it is complicated to establish the age of volcanic formations. The only exception in this situation is

Abstract— The Upper Neoproterozoic–Lower Cambrian section in the Olekma River basin is divided (from bottom to top) into the Dikimdia, Seralakh, Porokhtakh, and Pestrotsvetnaya formations, which are mainly composed of dolostones with a subordinate amount of sandstone, silty shales, gypsum, anhydrite, and native sulfur. The isotope data available allow one to substantially correct the stratigraphic

Abstract— The analysis of the recognized Late Cretaceous radiolarian assemblages from various structural and formation zones of the Olyutor and Algan terranes of the Koryak Highland has revealed a significant difference in their taxonomic composition, the quantitative content of radiolarians, and their morphological features. The radiolarian assemblage of the Olyutor terrane, which occupies the southern

Abstract The study of Callovian ammonites Longaeviceras and closely related taxa from the east coast of Anabar Bay (section 109, northern Siberia) is presented. Genera and species previously unknown here, such as Rondiceras milaschevici, Pseudolongaeviceras densicostatum gen. et sp. nov., Platylongoceras holtedahli, and Pseudocadoceras laminatum, are identified. The presence of the Eboraciceras subordinarium

Abstract New petrogeochemical data and the first results of U–Pb dating of detrital zircons from terrigenous units of the Nyarovei series, which refers to the basal level of the Meso–Neoproterozoic sections of the Polar Urals, are presented. On the basis of the analysis of the contents of petrochemical components, rare (Th, Co, Sc, Cr, and V) and rare earth elements in the rocks, and their ratios,

Abstract— The characteristics of the mollusk assemblages in the Cenozoic key section at Kvachina Bay in West Kamchatka are given. Sixteen stratigraphically successive beds with mollusks, which are grouped in five horizons, are recognized in the sedimentary sequence with a total thickness of approximately 450 m. The biostratigraphic units are correlated with the regional horizons, and their age is determined

AbstractAnalysis 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

AbstractThe 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

AbstractThe 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

AbstractNew 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

AbstractThe 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 Formation

AbstractAn 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

AbstractOn 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 facially

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 of

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. The

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 belong

AbstractA 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

AbstractThe 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

AbstractThe 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

AbstractThe 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

AbstractFusulinids 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

AbstractAnalysis 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

AbstractA 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 attributed

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 the

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

AbstractRadiolarians 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 with

AbstractThe 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 various

AbstractThe 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

AbstractThe 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

AbstractThe 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

AbstractFor 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

AbstractThe 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 Okhotsk-Chukotka

AbstractIn 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 to

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

AbstractThe 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—The C and Sr isotopic signatures and the Pb–Pb age of carbonate sedimentary rocks of the Vorogovka Group in the reference section in the Vorogovka River valley, northwestern Yenisei Range, were obtained. The deposits of the group ascribed to the Severnaya Rechka, Mutnina, and Sukhaya Rechka Formations fill a large trough, and lithological and textural features indicate a high sedimentation

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

AbstractThe association of organic-walled microfossils of the Kaltasy Formation, which includes morphologically complex large forms, is considered on the basis of previous and new materials. In general, the Kaltasy microbiota is similar to many associations of the Neoproterozoic (Late Riphean and Vendian) microfossils and, originally, was erroneously interpreted as Late Riphean, in spite of missing

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