Alexander S Alekseev

Lomonosov Moscow State University | MSU · Department of Paleontology

Restudy of Campyloprion annectans Eastman, 1902 from North America demonstrated that neither specimen included is diagnostic at the species level; thus, the species name is a nomen dubium. Since this species was designated as the type species of the genus, this requires suppression of the generic name also. Another species earlier assigned to Campy...

Начиная с 1808 г. Г.И. Фишер совершил ряд поездок в долину р. Ратовки близь г. Верея, где местное население добывало известняки для производства извести. Изучая береговые обнажения пород каменноугольного возраста, Г.И. Фишер обнаружил тонкие прослои тонкозернистых минеральных образований светло-сиреневого цвета. В отобранных образцах химическим ана...

A new genus and species of cyclidan Magnitocyclus struveae gen. et sp. nov., from the Mississippian of the Urals is described and illustrated. It is the first reliable record of a cyclidan in the Upper Viséan-Lower Serpukhovian of Russia. Petschorocaris kozhimensis, from the Permian of the Pechora Coal Basin (Russia), is not a cyclidan but is appar...

The Devonian–Carboniferous boundary beds in the Berchogur (Birshogyr) sections in the Mugodzhary (Mugalzhary) Mountains in western Kazakhstan, known to contain various fossil groups, including ammonoids, conodonts, foraminifers, corals, crinoids, and trilobites, are re-examined. The siliciclastic-carbonate succession of the Zhangana Formation revea...

Traces of extremely powerful explosive volcanic eruptions are documented in the southern Moscow Syneclise; the eruptions occurred in the Moscovian Age about 309 million years ago in Variscan orogenic regions adjacent to the East European Platform. Interbeds of altered volcanic ash, 5–15 cm thick, can be traced over the distance of tens of kilometer...

На юге Московской синеклизы документированы следы чрезвычайно мощных эксплозивных вулканических извержений, происходивших в московском веке (приблизительно 309 млн лет назад) в соседних с Восточно-Европейской платформой орогенных областях варисцийского возраста. Прослои измененных вулканических пеплов в подольском и мячковском подъярусах московског...

Several existing schemes for Carboniferous stratigraphy officially adopted in regions of the Russian Federation are summarized and discussed. These regions with different geological histories and distinct depositional settings include the Moscow Basin, the Urals, North Timan, Siberia, the Kuznetsk Basin, the Mongol-Okhotsk Region, and the Verkhoyan...

Horacek et al. (2021) commented on our publication arguing that we used an incorrect biochronology to define the Permian-Triassic (PT) boundary and that this inaccurate definition resulted in an erroneous interpretation of the oxygen isotope record in the studied Chanakhchi (former Sovestashen) section. Their comment gives us the opportunity to dis...

The Olistostrome member of the Sana-Una Paleozoic complex of the Ljubija ore mine in Bosnia and Herzegovina contains limestone fragments of pebble to block size that have been examined paleontologically. The recovered conodont fauna of the first sample is characterized by the species Declinognathodus lateralis, Idiognathoides sulcatus sulcatus and...

Carboniferous conodont biostratigraphy comprises regional zonations that reflect the paleogeographic distribution of taxa and distinct shallow-water and deep-water conodont biofacies. Some species have a global distribution and can effect high quality correlations. These taxa are incorporated into definitions of global Carboniferous chronostratigra...

The Paleozoic conglomerate at Podlipoglav in the transitional area between the External and Internal Dinarides of Slovenia contains limestone pebbles that have been examined micropaleontologically. The recovered conodont faunas are marked by the obvious absence of shallow-water taxa. The Lower to Middle Devonian faunas are characterized by relative...

The characteristic and ground of early Carboniferous (Mississippian) reefal locality Akkermanovka-Khabarnoe in the “Centralny” Quarry, southern Orenburg Region (South Urals) as fossil lagerstätt of the “concentrate” type are given. The bioherm limestones contain nicely preserved brachiopods, corals, trilobites, cyclids, rostroconchs, polyplacophora...

Within the crustacean group Cyclida, Prolatcyclus gen. nov. includes two species, Prolatcyclus martinensis (Goldring, 1967) and P. kindzadza sp. nov., described from the Lower Carboniferous (Mississippian, upper Viséan) of England and the Southern Urals of Russia, respectively. Members of the genus have a unique feature for cyclids – large hypertro...

Recent studies of the sections suitable for defining the base of the Serpukhovian Stage have revealed several major problems preventing an immediate solution of this long overdue stratigraphic task. These are: (1) absence of a suitable continuous section in the Serpukhovian type region; (2) rarity of sections with ammonoids (Nikolaeva & Kullmann, 2...

Recent studies of the sections suitable for defining the base of the Serpukhovian Stage have revealed several major problems preventing an immediate solution of this long overdue stratigraphic task. These are: (1) absence of a suitable continuous section in the Serpukhovian type region; (2) rarity of sections with ammonoids (Nikolaeva & Kullmann, 2...

The Basu section located in a small roadside quarry on the right bank of the Basu river, a tributary of the Inzer river (the western slope of the Southern Urals) is considered as a candidate for the role of the stratotype (GSSP) of the lower boundary of the global Moscovian stage (Pennsylvanian) (Kulagina et al., 2009). Unfortunately, since its stu...

Several Devonian-Carboniferous (D-C) Boundary sections in the Berchogur Depression (Mugodzhary Mountains, Western Kazakhstan), contain a succession of boundary beds with ammonoids, conodonts, foraminifers, miospores, ostracodes, brachiopods and corals (SIMAKOV et al. 1985; BARSKOV et al. 1984, 1988; KUSINA 1985; KOCHETKOVA et al. 1987). Several sec...

The Serpukhovian Stage, proposed by NIKITIN (1890), was re-established in the Russian stratigraphic scheme in 1974 by the Interdepartmental Stratigraphic Committee of the USSR and has become internationally recognized as the upper stage of the Mississippian Subsystem (HECKEL & CLAYTON 2006). The base of the Serpukhovian has not been defined by a Gl...

The Basu section in the South Urals is one of two GSSP candidates for the base of the Moscovian Stage (Middle Pennsylvanian) (KULAGINA et al. 2009). It is represented by relatively deep-water mid- and outer ramp limestones with chert nodules and bands (GOROZHANINA et al. 2018), and contains rich assemblages of conodonts, including Declinognathodus...

Permian-Triassic boundary sections from Armenia were studied for carbon isotopes of carbonates as well as oxygen isotopes of conodont apatite in order to constrain the global significance of earlier reported variations in the isotope proxies and elaborate the temporal relationship between carbon cycle changes, global warming and Siberian Trap volca...

This paper aims to evaluate potential biostratigraphic markers for the Viséan–Serpukhovian boundary in sections of Europe and Asia, to help identify the base of the global Serpukhovian Stage, which is a high priority task for Carboniferous biostratigraphy. Sections in the Serpukhovian stratotype area in the Moscow Basin contain a gap at the base of...

Р1 elements of species of the conodont genus Lochriea existing in the Viséan were very variable and had a number of transitional morphotypes. This variability is still not sufficiently studied, hence voting on the selection of L. ziegleri as the marker of the base of the Serpukhovian, as suggested by Qi et al. (2018), is premature. For example, it...

Р1 elements of species of the conodont genus Lochriea existing in the Viséan were very variable and had a number of transitional morphotypes. This variability is still not sufficiently studied, hence voting on the selection of L. ziegleri as the marker of the base of the Serpukhovian, as suggested by Qi et al. (2018), is premature. For example, it...

New findings of Cyclida in Lower Carboniferous of Russia

A new trilobite species, Ditomopyge (Carniphillipsia) mosquensis sp. nov., from the Gzhelian of the Moscow Region (Rusavkino, Gzhel, and Shchelkovo localities) is described. Its members have previously been assigned to Ditomopyge (Carniphillipsia) planiloba (Weber, 1933). The establishment of Griffithides grue-newaldti var. ivanovi Ivanov et Weber...

Skuinocyclus juliae gen. et sp. nov. from Lower Permian limestones of the Shakhtau Reef (Sterlitamak, Republic of Bashkortostan) is the second discovery of a member of the order Cyclida in the Permian of Russia and the oldest member of the family Hemitrochiscidae. Based on the material described by Kramarenko (1961) as Cyclus miloradovitchi from th...

Композитный по макрофауне разрез маастрихтских отложений верхнего мела составлен с использованием методики графической корреляции по материалам разрезов Красный Октябрь и Большевик (район г. Вольска в Саратовском Поволжье). История развития макрофауны в маастрихтское время распадается на ряд эпизодов разной длительности и различного содержания. В р...

A new trilobite species, Ditomopyge (Carniphillipsia) mosquensis sp. nov., from the Gzhelian of the Moscow Region (Rusavkino, Gzhel, and Shchelkovo localities) is described. Its members have previously been assigned to Ditomopyge (Carniphillipsia) planiloba (Weber, 1933). The establishment of Griffithides gruenewaldti var. ivanovi Ivanov et Weber i...

Determining the base of the Serpukhovian Stage is one of the most pressing tasks for Carboniferous biostratigraphy, since it has been shown that sections in the stratotype area in the Moscow region contain a gap at the base of the classical Serpukhovian (at the base of the Tarusian Regional Substage) and that the boundary level cannot be precisely...

The Serpukhovian Stage, proposed by Nikitin [I], was re-established in the Russian stratigraphic scheme in 1974 by the Interdepartmental Stratigraphic Committee of the USSR and has become internationally recognized as the upper stage of the Mississippian Subsystem. The base of the Serpukhovian has not been defined by a Global Stratotype Section and...

The Verkhnyaya Kardailovka section is one of the best candidates for the GSSP (Global Stratotype Section and Point) at the base of the Stage (Mississippian). For boundary definition, the first appearance of the conodont Lochriea ziegleri Nemirovskaya, Perret et Meischner, 1994 in the lineage Lochriea nodosa (Bischoff, 1957)−L. ziegleri is used. L....

TheKugarchi Section in the Zilair Synclinorium in the SouthUrals (Russia, Bashkortostan) is one of themost complete sections of the Bukharcha Formation, including the entire Serpukhovian and the lower Bashkirian. This is the type section of the Bogdanovkian Regional Infrasubstage (‘Horizon’), the lowermost Bashkirian of the Urals. The section spans...

The Devonian-Carboniferous boundary section near the village of Dzerzhinka (vicinity of Verkhneuralsk) on the Ural River on the eastern slope of the South Urals, Russia, contains a wide variety of fossil invertebrates, including foraminifers, ostracodes, ammonoids, conodonts, and brachiopods. Diverse Upper Famennian assemblages are associated with...

The Serpukhovian Stage, proposed by Nikitin [I], was re-established in the Russian stratigraphic scheme in 1974 by the Interdepartmental Stratigraphic Committee of the USSR and has become internationally recognized as the upper stage of the Mississippian Subsystem [II]. The base of the Serpukhovian has not been defined by a Global Stratotype Sectio...

New data on the taxonomic composition of the algal flora of the Late Viséan of the Moscow Basin are discussed based on newly collected material. The algal assemblage comprises 24 taxa, 14 taxa identified to species, nine identified to genus, and one taxon not positively identified. Representatives of the genera Anthracoporella, Anthracoporellopsis,...

The information on 95 localiities of trilobites from Middle and Late Carboniferous (Pennsylvanian) and Permian known in the Russia and some surrounding countries mainly from papers by V.N. Weber and O.G. Tumanskaya published in 1930th is corrected. The most number of localities situated in the Pre-Urals and western slope of the Urals (25), Moscow (...

Radiolarians of Leugeonidae Yang et Wang, 1990, which represent a morphologically distinctive group of spherical radiolarians of the Spumellaria order, were found for the first time in Crimea and reliably confirm the Jurassic age of the finding. The nodules, which host the Jurassic radiolarians, were collected by A.S. Alekseev in 1983 in the terrig...

The upper Viséan–Serpukhovian strata in the type region for the Serpukhovian Stage is an epeiric-sea succession ca. 90m in thickness. The predominantly Viséan Oka Group (comprising the Aleksin, Mikhailov, and Venev formations) is dominated by photozoan packstones with fluvial siliciclastic wedges developed from the west. The Lower Serpukhovian Zabo...

We provide a synthesis of stratigraphic data to unravel the history of the geological evolution of South Crimea in the Mesozoic and Cenozoic. The South Crimea Orogen consists of three major mega-sequences: (1) the Triassic–Early Jurassic; (2) the Aalenian–Bathonian; and (3) the Callovian–Eocene. The Late Triassic–Early Jurassic deposits formed in t...

Papers presented at the International Congress cover all aspects of the Earth history in the Carboniferous and Permian periods. Congress participants reported on the boundary definitions of the International Chronostratigraphic Scale and GSSP choices, high-resolution stratigraphy, Late Paleozoic glaciations and interglacials, tectonics and orogenie...

The International Stratigraphic Chart of the Phanerozoic is constructed by drawing lower boundaries of stratigraphic units with reference to Global Boundary Stratotype Section and Point. Some systems retain former, usually European, names of stages, whereas new sequences of stages are proposed for others, such as for Cambrian and Ordovician. The bo...

In order to better constrain a lower age limit of the beginning of Arctida-Baltica collision (Pre-Uralian-Timanian orogeny), U/Pb dating was performed on detrital zircons (60 analyses) from sandstones of the Lower Cambrian Brusov unit of Padun Fm. composing the uppermost layers of the Upper Vendian (Ediacaran) - Lower Cambrian sequence within the S...

The purpose of the field trip is to show the standard and reference Carboniferous sections of the eastern slope of the South Urals. The area of the excursion is on the border of the Chelyabinsk Region and the Republic of Bashkortostan. The guidebook includes a summary of geology and Carboniferous stratigraphy of the Urals. Eight geological objects...

The article describes the works of Peter Simon Pallas (1741–1811), the outstanding naturalist, member of the Sankt-Petersburg Academy of Sciences, devoted to results of paleontological researches of animals of the “mammoths fauna”. During two long expeditions he recognized and described many fossils. He introduced first in the Russia formal nomencl...

Twenty-nine fusulinid species of 14 genera are determined in the Podolskian and Myachkovian substages (Pennsylvanian) of the southern Moscow Basin. All test sections are determined to genus level, except for the genera Schubertella and Fusiella. Since it is impossible to distinguish between these two genera in oblique test sections, they are identi...

The basement of the northeastern periphery of the East-European Craton (ЕЕС) is composed of volcanic-sedimentary sequences, volcanic rocks, granitoids, and rare ophiolite complexes. Geochronological data constrain their age from ca. 750 to 500 Ma, and there is a consensus that these rocks represent relicts of a late Neoproterozoic–Cambrian Pre-Ural...

The detailed stratified description of the section of "Krasny Oktyabr" quarry, located on the southern outskirts of Volsk Town (the north of Saratov region, Russia), is resulted in the article. It are defined the rocks of the top of Paramonovskaya Formation (upper Albian), as well as the fragments of Bannovskaya (upper Turonian), Volskaya (upper Co...

Излагаются результаты комплексного изучения белгородской и павловской свит верхнего кампана, суходольской свиты переходного от кампана к маастрихту интервала, а также ефремово-степановской свиты маастрихта. На основе анализа менявшихся литологических показателей и коррелятивно связанного с ними состава биотических сообществ выделены разделенные пер...

The study present the results of the integrated study on the Belgorod and Pavlovka formations (upper Campanian), Sukhodol Formation (Campanian–Maastrichtian), and Efremovo-Stepanovka Formation (Maastrichtian). Variations in lithological indicators and associated changes in the biotic assemblages were used to distinguish three stages in the basin ev...

The ages only older than 1836 ± 29 Ma ("Baltic provenance signal") were obtained for detrital zircons from sandstones of Tamitsa unit of Ust-Pinega Formation (Upper Ediacaran), south-east White-Sea region. The absence of the zircons with "Pre-Uralides-Timanides" ages (ranging within ~ 750-510 Ma) indicates that during the Late Ediacaran, the erosio...

The upper Viséan–Serpukhovian strata in the type region for the Serpukhovian Stage is an epeiric-sea succession ca. 90m in thickness. The predominantly Viséan Oka Group (comprising the Aleksin, Mikhailov, and Venev formations) is dominated by photozoan packstones with fluvial siliciclastic wedges developed from the west. The Lower Serpukhovian Zabo...

On the basis of the first data on the taxonomic composition and stratigraphic distribution of conodont assemblages in the Borehole Gavrilov Yam-1 section (central part of the Moscow Syneclise), its biostratigraphic subdivision is proposed with specification of some formations previously substantiated by finds of acritarchs and benthic faunal assemb...

Paper is devoted to the sequence stratigraphy for Lower Carboniferous deposits of the Southren part of the Moscow basin

in attached file - the whole volume and programm IN RUSSIAN

In the attached file - the whole volume of PALEOSTRAT-2013 IN RUSSIAN

2012. Terminal Maastrichtian ammonites from Turkmenistan, Central Asia. Acta Palaeontologica Polonica 57 (4): 729–735. A complete uppermost Maastrichtian–Danian succession in the Sumbar River section, western Kopet Dagh (southwest Turkmenistan, Central Asia), constitutes one of the few instances in the world where the fossil record of the last ammo...