Baraboshkin Evgeny

• DrSci
• Professor (Full) at Lomonosov Moscow State University

Stratigraphic problems of the Barremian interval of Ulianovsk-Saratov region (Volga River) are discussed in the paper

Based on the results of paleomagnetic studies, which are part of intergrated bio-, chemo-and mag-netostratigraphic studies of the Upper Cretaceous North Caucasus, analogs of magnetic chrons C34n and C33r are identified in the Podkumsky quarry section near the city of Essentuki. The Santonian-Campanian boundary is drawn in the section due to this, b...

The history of the study of the Volgian Stage of the Upper Jurassic and Ryazanian Stage of the Lower Cretaceous, their geographical distribution and use in the world practice, subdivision and correlation are considered. The data on the distribution of different groups of macro- and microfossils (ammonites, bivalves, radiolarians, dinocysts, and mar...

The Camborygma ichnofacies is described for the first time in the Lower Cretaceous deposits of Western Siberia. The burrows Camborygma of crayfish are confined to the clayey facies of the swampy floodplain, which alternate with the sandy deposits of crevasse splays and “floodplain sands” with the burrows of insects of the Scoyenia ichnofacies. Both...

For the first time, the mineral composition of ammonite shells of jewelry and ornamental quality has been studied in detail on Sakhalin Island. They were found in carbonate concre-tions from Cenomanian-Campanian (Bykov Formation) of the Upper Cretaceous. The multidisciplinary studies of shells included the determination of microhardness, density, l...

A reference section of the Upper Cretaceous of the southwestern Crimea has been compiled on the basis of a detailed study and correlation of 48 individual sections. The set of methods included sedimentological, paleontological (ichnology, macrofossils: ammonites, belemnites, inoceramids), microfossils (nannoplankton, benthic and planktonic foramini...

As a result of sedimentological study of the Kimeridge-Berriasian interval rocks, characterized by core from wells, drilled in the Caspian Sea area in the Prikumskaya-Central-Caspian system of depressions and uplifts, lithotypifi cati on was carried out. Microfacial types were also identifi ed and facies were determined based on this data. It was e...

Representatives of Belemnitella conica Arkhangelsky from the Campanian-Maastrichtian boundary interval of the Crimean-Caucasian region were studied. It was shown that in the Crimea in the same stratigraphic interval B. hoferi and another species related to B. minor may be present. Additional material is needed to substantiate this.

The history of study of the Upper Jurassic Volgian Stage and Lower Cretaceous Ryazanian Stage, their geographic occurrence, and use in world practice, subdivision, and correlation are considered. The data on the occurrence of various groups of macro-and microfossils (ammonites, bivalves, radiolarians, dino-cysts, and marine vertebrates) in the Volg...

An ammonite-based biostratigraphic scheme covering the entire Upper Cretaceous interval is proposed for South-Western Crimea for the first time.

For the first time, a composite C-isotope curve for the entire Upper Cretaceous was obtained for the Southwestern Crimea. Based on comparison with other sections, globally traceable isotopic markers have been identified, which can be used to clarify and detail the stratigraphic subdivision of the Upper Cretaceous deposits of Crimea, as well as for...

This paper summarizes the state of knowledge of the Cretaceous stratigraphy of the Mountainous Crimea and selected biostratigraphic groups and magnetostratigraphy. The first part of the paper discusses the Early Cretaceous, its stratigraphy, selected fossil groups and magnetostratigraphy of the Mountainous Crimea. The data on the figured reference...

The lower Cenomanian ammonite Sharpeiceras cf. laticlavium (Sharpe, 1855) and the middle Cenomanian ammonite Calycoceras (Gentoniceras) gentoni (Brongniart, 1822) were found for the first time in the Selbuhra Mountain section in the South-Western Crimea. These finds allow us to complete the biostratigraphic subdivision of the Cenomanian in the Sout...

This paper is devoted to new data on the stratigraphy of Campanian deposits in the stratotype of the Kudrinskaya Formation of South-Western Crimea. For the first time, integrated sedimentological, biostratigraphical (ichnofossils, cephalopods, inoceramids, foraminifera, dinocysts, nannoplankton, gilianellids), isotope-geochemical, palaeo- and petro...

Cenomanian ammonoid Calycoceras (Calycoceras) naviculare (Mantell, 1822) (Acanthoceratidae, Ammonoidea) was found in the well-known section of Selbukhra Mountain in the vicinity of Nauchnyi Town of southwestern Crimea. This is the first find of the ammonoid in the upper Cenomanian deposits in the Crimea and in Russia

The history of the study of the Volgian Stage of the Upper Jurassic and Ryazanian Stage of the Lower Cretaceous, their geographical distribution and use in the world practice, subdivision and correlation are considered. The data on the distribution of different groups of macro- and microfossils (ammonites, bivalves, radiolarians, dinocysts, and mar...

Rare ammonite finding

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 Turonian of this region, to recognize the ammonite dispersal features in the Arctic region, and to clarify the paleogeography of the Turonian a...

In 394 samples characterizing 266 stratigraphic levels in four Turonian–Santonian sections in the Southwestern Crimea, characteristic remanent magnetization components (ChRM) formed at the stage of diagenesis is identified. The data obtained represent the record of the Paleocene geomagnetic variations of high amplitude (rms deviation S = 25.9° with...

The Cenomanian ammonite “Ammonites Cabardinense”, first described from the Mineralnye Vody region of Kabardino-Balkaria and cited from several localities in the Caucasus and Transcaucasia, is discussed. The location of the holotype is unknown, and a re-examination of the “Sharpeiceras cabardinense” from Transcaucasia has shown that it belongs to th...

Background. Along with ammonites and septaries, concretions with fossils are increasingly being used as jewelry and ornamental materials in Russia. Such concretions are characterized by a wide range of sizes, as well as high decorative and technological properties, making them attractive materials for manufacturing diverse interior and jewelry prod...

This paper summarizes the data on the Early Cretaceous palaeogeography of the Russian Platform (RP) in a context of the development of North-eastern Peritethys. One of the main features of the region is the constant mutual influence of the Tethyan and Boreal water masses through the system of straits. The latest Volgian to Barremian development of...

In this conference paper discuss preliminary data on variations in the isotopic composition of oxygen and carbon in Cenomanian deposits of Mount Selbukhra-Yuzhnaya (Southwestern Crimea). Based on the correlation of C-isotope curves and biological events with sections of other regions, globally traceable isotope markers have been identified. Using t...

Sedimentology

Pseudosaynella undulata (Sarasin, 1893) in the Lower Aptian deposits of the Middle Volga region

Cenomanian deposits

Magnetostratigraphic data on the Cenomanian section of Mount Selbuhra

Sr и Ni. Минерализация раковин начиналась с образования слоев пирита. По минераль ному составу раковины аммонитов отнесены к кальцит-пиритовому типу. Ключевые слова: аммониты, нижний мел, аптский ярус, пирит, кальцит, ювелир ные материалы, Северный Кавказ Abstract. For the first time, the stratigraphic position and mineral composition of ammonites...

For the first time, the stratigraphic position and mineral composition of jewelry and ornamental carbonate concretions (septarians) of the Republic of North Ossetia-Alania were studied in detail. Septarians are collected in the Middle Aptian in the middle course of Urukh River. The complex of studies included the determination of microhardness, den...

Lower Campanian Pachydiscus (Pachydiscus) launayi (De Grossouvre) was found for the first time above the layer of soap (bentonite) clays widely known in the literature in an old quarry on the outskirts of the Kudrino village in the southwestern Crimea. This find expands the understanding of the distribution of this species and clarifies the biostra...

The new data on the stratigraphy of the Campanian–Maastrichtian deposits of the Chakhmakhly secton of Bodrak River Basin (Southwestern Crimea) have been reported

Background. Ammonite products are increasingly gaining in popularity. Ammonites are characterised by a variety of colour shades, shapes and sizes, making them suitable for manufacturing a wide range of souvenir and jewellery products. Russia enjoys significant resources of ammonites of interior and jewellery-ornamental quality; however, these mater...

The article briefly discusses the features of modern stratigraphic schemes of the Cretaceous System

The Campanian section of Northern Sosva River near Ust-Manya village was re-examined. It is established that the succession is different than previously thought. The analogues of North American “Baculites sp. (smooth)" – B. mclearni Zones of the upper Lower to lower Middle Campanian were recognised. An analogue of the Lower Campanian Scaphites (S.)...

The work is devoted to new data on the structure of the Campanian deposits in the area of the village of Kudrino. Here, for the first time, near an interlayer of soap clays, well known in the geological literature, finds were made of the Lower Campanian ammonite Pachydiscus (Pachydiscus) launayi De Grossouvre and the inoceramids Sphaeroceramus saru...

As a result of twenty years of complex bio- and magnetostratigraphic studies, the composite paleomagnetic section of the Cretaceous of the Crimean Mountains has been elaborated. This section is compared with the geomagnetic polarity scale

Ichnoassemblages of the Jurassic Delta of Cape Meganom (Eastern Crimea)

Depositional environments of Jurassic Delta of the Meganom Cape (Eastern Crimea).

Bryozoans encrusting belemnite rostra from the Upper Cretaceous of the Middle Volga region (environs of Volsk and Shikhany) and Central Crimea (Mount Ak-Kaya) are studied. Since the colonies are poorly preserved, they lack many diagnostic features; therefore, most of the species are listed in open nomenclature. The bryozoans studied are from the Mi...

The paper presents the results of petro- and paleomagnetic studies of two sections of Turonian – Santonian on the Samara Right Bank – near Novodevichye, Podval’e villages and detailed geological description of the Novodevichye section. The magnetostratigraphic subdivision and detailed correlation of the sections were carried out. Unknown unconformi...

The family Lytoceratidae Neumayr, 1875 was found for the first time in more than a century in the Upper Hauterivian deposits near the village of Polivna (Ulyanovsk Region). The two specimens found are assigned to the new species Lytoceras polivnae, which is briefly described. These are large forms, for which postmortem transportation is suggested....

New finds of Upper Cretaceous ammonites from sections and well cores of Western Siberia are figured, including new records for the region: Rhaeboceras cf. halli (which is briefly described); Rhaeboceras aff. subglobosum; and Collignoniceras woolgari. The Late Cretaceous paleogeography of the Northern Hemisphere and ammonite migration routes are dis...

The paper continues a complex study of the Santonian–Campanian boundary of the Aksu-Dere and Kudrino-2 sections (Bakhchisarai region, Southwestern Crimea), the sedimentological and biostratigraphic data on which are provided in paper 1. This work presents the paleomagnetic, rock magnetic, and geochemical data on C and O stable isotopes. The 87Sr/86...

The paper continues a complex study of the Santonian-Campanian boundary of the Aksu-Dere and Kudrino-2 sections (Bakhchisarai region, Southwestern Crimea), the sedimentological and biostratigraphic data on which are provided in paper 1. This work presents the paleomagnetic, rock magnetic, and geochemical data on C and O stable isotopes. The 87 Sr/...

The structure of the type section of the Upper Cretaceous of the southern pre‐Urals is pointed. A representative collection of ammonites and bivalves has been collected. Microfauna studies have confirmed the presence of the Lower Campanian and Lower Maastrichtian. The Upper Maastrichtian presence in the section was established at first.

The Tethyan-Boreal correlation of the Hauterivian Stage is discussed on the basis of non-paleontological methods (paleomagnetic and isotope-stratigraphic). Based on the integrated correlation, it was shown that the top of the Boreal Hauterivian is located within the discofalcatus ammonoid Zone, and the boundary of the lower and upper substages lies...

The validity of the existing Boreal zonal standard for the West Siberian paleobiogeographic province is analyzed , including local zones for ammonites and inoceramids of the Upper Cretaceous of Western Siberia (with-out the Cenomanian). It is shown that the North American sequence of Upper Cretaceous ammonite and inoceramid zones is more suitable f...

In the lower half of the Bathonian Kamenny Ovrag Formation of the Saratov region (the left-bank of the River Volga area), that is represented by the interbedding of light-gray clays and grayish-white soft siltstones, and characterized by rare foraminifers Ammodiscus baticus, we observed the 5-metre interval that has been intensively reworked by U-s...

Статья продолжает публикацию результатов комплексного изучения пограничного интервала сантона–кампана разрезов Аксу-Дере и Кудрино-2 (Бахчисарайский район, Юго-Западный Крым), седиментологические и биостратиграфические данные по которым приведены в статье 1. Представлены палеомагнитные, петромагнитные, геохимические данные по стабильным изотопам уг...

New complex data have been obtained for two sections of the Santonian–Campanian boundary of Southwestern Crimea. Article 1 presents detailed geological descriptions of sections, lithological, mineralogical, and paleoichnological materials, and the results of determining macro- (crinoids, ammonoids, belemnites) and micropaleontological (dinocysts, n...

Bioerosion trace fossils preserved on Late Cretaceous belemnite rostra from the Middle Volga region and Western Kazakhstan have been studied. Most of the borings belong to the ichnogenera Entobia and Dendrina. Boring bryozoans of the genus Voigtella (order Ctenostomata) and traces made by ichnogenera Calcideletrix and Rogerella are less abundant. I...

Bioerosion trace fossils preserved on Late Cretaceous belemnite rostra from the Middle Volga region and Western Kazakhstan have been studied. Most of the borings belong to the ichnogenera Entobia and Dendrina. Boring bryozoans of the genus Voigtella (order Ctenostomata) and traces made by ichnogenera Calcideletrix and Rogerella are less abundant. I...

The taxonomic composition and detailed stratigraphic distribution of the calcareous nannofossils from the Santonian and Campanian of the Crimea have been studied for the first time. The identified assemblage of calcareous nannofossils in the Alan-Kyr section consists of 85 species, including all primary and additional zonal markers. The following c...

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 provides new data on ammonite-based biostratigraphy of the Carolinefjellet Formation, indicating the presence of Beds with Tropaeum arcticum (m...

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...

Получены новые комплексные данные по двум разрезам пограничного интервала сантона–кампана Юго-Западного Крыма. В статье 1 представлены детальные геологические описания разрезов, литоло-го-минералогические и палеоихнологические материалы, результаты определений макро- (криноидеи, аммониты, белемниты) и микропалеонтологических (диноцисты, наннопланкт...

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...

For the first time, some trace fossils from the Santonian-Campanian deposits of the South-Western Crimea (sections Kudrino and Aksu-Dere) were examined. A brief description is given, possible producers and their ichnofacial relation are discussed.

Albian stratigraphy and ammonite assemblages of Eza River (central part of the Russian Platform) are discussed. A new species Anadesmoceras vladimirovi Baraboshkin, sp. nov. is briefly described.

This is the description of nannoplankton assemblages for the first time reported from the upper Tithonian – Berriasian sequences in Theodosia area of East Crimea. Relationships between nannoplankton assemblages and magnetic zones are examined. Close characteristics of the lowermost parts of the Grandis ammonite subzone, NKT nannoplankton zone and M...

For the first time, some trace fossils from the deep-water Callovian–Oxfordian deposits of the Eastern Crimea, exhibited on the walls and footpaths of the Genoese Fortress in Sudak, are considered. Their brief ethological characteristics, possible producers and ichnofacies are discussed. Ubinia alternans, Taenidium isp., Ophiomorpha annulata, Helmi...

The Aksudere ravine section of the Santonian/Campanian boundary interval of the Upper Cretaceous is well known in the Mountainous Crimea, since it is one of the most complete. At the same time, macrofossils are extremely rare there. Therefore, they are of great value for the paleontological justification of the Santonian – Campanian boundary. The a...

A study of heteromorph ammonoids from the Hauterivian – Barremian succession of the south-western Crimea, has prompted revision the genus Paraspiticeras Kilian. The results suggest that Paraspiticeras was probably descended from the early Hauterivian heteromorph Crioceratites by recoiling of the spiral. Its taxonomic position as representative of S...

In this article there are the results of sedimentological, palynological and paleomagnetic studies of upper Cretaceous in Alan-Kyr section (Central Crimea). The nomenclature of rocks was specified, and their deep-water genesis was justified. According to palynologic data, the age of sediments is estimated as late Campanian, in the lower part of the...

The results of sedimentological, palynological, and paleomagnetic studies of the Upper Cretaceous Alan-Kyr section (Central Crimea) are presented. The rock nomenclature is characterized and a deep-water genesis is determined. Based on the palynological data, the sediments are estimated as Lower Campanian and, partially, Upper Campanian (under two-p...

Проведено комплексное исследование кампан-маастрихтских отложений горы Бешкош (Юго-Западный Крым). Изучены находки головоногих моллюсков, диноцисты, впервые получены изотопные, палео- и петромагнитные данные; проведен ихнофациальный и седиментологический анализ. Макро- и микропалеонтологические данные позволили уточнить стратиграфическое расчленени...

In this article there are the results of sedimentological, palynological and paleomagnetic studies of upper Cretaceous in Alan-Kyr section (Central Crimea). The nomenclature of rocks was specified, and their deep-water genesis was justified. According to palynologic data, the age of sediments is estimated as late Campanian, in the lower part of the...

The rare sample of the Schloenbachia cf. varians (J. Sowerby, 1817) was found in 2019 in the Ulyanovsk City region. The sample is a Lower Cenomanian phoisphorite mould redeposited in the Lower Turonian chalk. The morphology, stratigraphic and geographical distribution of this species are briefly discussed.

The problem of tracking the internationally approved GSSP of the Campanian / Maastrichtian Stages boundary in the sections of the Russian Plate is considered. The completest sections of the Campanian/Maastricht boundary interval in the region of the Volsk City in the Middle Volga region and the Aktolagay Plateau in Western Kazakhstan were comprehen...

Приведены результаты седиментологических, палинологических, палеомагнитных и петромагнитных исследований разреза верхнего мела Алан-Кыр (Центральный Крым). Уточнена номенклатура пород и обоснован их глубоководный генезис. По палинологическим данным отложения отнесены к нижнему и частично к верхнему кампану (при двучленном делении яруса), в низах и...

The description of rocks is one of the most time-consuming tasks in the everyday work of a geologist, especially when very accurate description is required. We here present a method that reduces the time needed for accurate description of rocks, enabling the geologist to work more efficiently. We describe the application of methods based on color d...

This article is concerned with nannofossil study of Tithonian–Berriasian sediments of Eastern Crimea. The NJT 16, NJT 17a, NJT 17b, NKT, and NK 1 nannofossil zones were determined. The occurrence of Nannoconus kamptneri minor, one of the potential marker-types of the Tithonian–Berriasian boundary (the base of the NKT Zone) of the Tethyan sequence i...

For the first time during the last 100 years, the presence of Tirnovella occitanica ammonite Zone in the Berriasian section of Feodosia was confirmed. The results of sedimentological, bio- and magnetostratigraphic study of this interval are discussed in the paper.

Ichnoassemblges of а distally steepened ramp of the Тithonian-Berriasian of the Eastern and Central Crimea are considered. lt is possible to recognise Nereites ichnofacies (with subichnofacies Ophiomorpha rudis) in the deep-water part of the steepened ramp; Cruziana ichnofacies in the outer ramp, and Skolithos ichnofacies within the middle and inne...

The occurrence of the Tirnovella occitanica Ammonite Zone in the Berriasian section of Feodosia was confirmed here for the first time. The results of sedimentological, bio-, and magnetostratigraphic study of this interval are discussed.

For the first time during the last 100 years, the presence of Tirnovella occitanica ammonite Zone in the Berriasian section of Feodosia was confirmed. The results of sedimentological, bio- and magnetostratigraphic study of this interval are discussed in the paper.

Berriasian-Middle Aptian interval of the Tethyan and Boreal scales correlated of the base of integrated biostratigraphic, paleomagnetic and chemostratigraphic (stable isotopes) data. The position of a number of Stage and Substage boundaries has been revised and the Boreal Cephalopod Zonal Standard has been refined.

The core of wells: Sarmatskaya-3 and 4, Khvalynskaya-5 (Caspian Sea) has been comprehensively studied (sedimentology, micro-, macrofauna, palynology, stable isotopes, paleo- and petromagnetism). The sections were correlated on a Member-scale, and their age was determined: Lower-, Upper Tithonian, Berriasian (or their Boreal analogues: Middle-, Uppe...

The paper discusses the belemnite Belemnitella pseudolanceolata (Jeletzky, 1948) from the Nizhnyaya Bannovka locality (the Volga River region). The species is morphologically close to the Campanian - Maastrichtian Belemnella lanceolata (v. Schlotheim, 1813), but comes from the Upper Campanian.

A unique Striaptychus shilovkensis Baraboshkin et Shumilkin, sp. nov. is described. The fi nding comes from the body chamber of the Early Aptian Ancyloceras matheronianum d’Orbigny from the Shilovka village locality (the Volga River, Ulyanovsk district). Previously, ammonites of the genus Ancyloceras were characterized by Praestriaptychus.

The article presents biostratigraphic (spore-pollen complexes, dinocysts, ammonites, ostracods) and magnetostratigraphic characteristics of the Berriasian deposits of the Tirnovella occitanica zone of the Zavodskaya Balka section (East Crimea)

Demands for speed which geological data should be processed is rising. The problem doubles when you don't have any unite Government or production standards for the processing of it. In addition to some geological tasks, there are no criteria for subjectivism reduction or hard to distinguish in boundary rock task. On the basis of machine learning an...

With a rapid increase in digital data, oil and gas companies are constantly looking for an automatic and accurate method to extract the geological information from the core. However, methods for automatic core analysis are very limited 2. At the moment, this is still done by an expert-geologist, which takes a lot of time and effort. Recently, Chatt...

Our data from studies over many years on upper Tithonian-Berriasian strata of the Crimean Mountains are summarised. Their zonal subdivision has been significantly refined using ammonites and foraminifera, as well as on the basis of calpionellid, ostracod and dinocyst distributions. We have been able to document the presence of all standard Tethyan...

Twenty species belonging to fifteen genera of cyclostome and cheilostome bryozoans encrusting belemnite rostra are described from the late Campanian to Maastrichtian of the Aktolagay Plateau, in western Kazakhstan. Due to the moderate to poor preservation of the material, only four cheilostome species are identified down to the species level: Wilbe...

The 6th Kilian Group meeting of the IUGS Lower Cretaceous Ammonite Working Group (the Kilian Group) was held in Vienna, Austria, 20th August 2017. The Group mainly discussed the standard zonation that is suitable for and based mainly on ammonite data of the Mediterranean Province of the MediterraneaneCaucasian Subrealm (Tethyan Realm). Some changes...