Article
Geosciences, Multidisciplinary
M. A. Rogov, I. V. Panchenko, L. E. Augland, V. B. Ershova, V. Yu. Yashunsky
Summary: This study provides the first reliable geochronological data from the West Siberia sedimentary basin to determine the age of the Tithonian/Berriasian (T/B) boundary. The dating of zircon grains derived from a tuff bed shows ages between 141.83 and 141.11 Ma, suggesting a re-consideration of the currently accepted age of the T/B boundary.
Article
Geology
Andy Gale, Jim Kennedy, Irek Walaszczyk
Summary: The study describes the upper Santonian and lower Campanian succession in central Texas, correlating the upper part of the Austin Chalk using benthonic crinoids, oysters, ammonites, and inoceramid bivalves along the outcrop between Austin and Waxahachie. The study reveals a disconformity between the Austin and the clays of the overlying Ozan Formation, marked by an erosional surface and a thin phosphatic conglomerate. The lower Campanian Ozan clays have yielded significant ammonites providing correlation to other regions.
NEWSLETTERS ON STRATIGRAPHY
(2021)
Article
Geosciences, Multidisciplinary
Mikhail A. Rogov, Julia N. Savelieva, Olga Shurekova
Summary: The study of Upper Jurassic deposits near the village of Valy in the Syzran district, Samara region, reveals a detailed biostratigraphic analysis with the identification of zones, subzones, and biohorizons. The findings include the establishment of specific zones in different periods of the Upper Jurassic, as well as the discovery of unique fossilized corals and warm-water taxa in certain layers, suggesting deposition during short-term warming events. The analysis also provides insights into the paleo-ecological conditions of the region, indicating sediment accumulation in warm shallow eutrophic basins with gradual changes in eutrophy over time.
VESTNIK OF SAINT PETERSBURG UNIVERSITY EARTH SCIENCES
(2021)
Article
Geography, Physical
Zofia Dubicka, Hubert Wierzbowski, Agnieszka Palczynska
Summary: The study focuses on the oxygen and carbon isotope ratios of Jurassic foraminifera from Poland, comparing them with co-occurring macrofossils. It reveals a consistent offset in delta O-18 values of Lenticulina and significant biases in delta O-18 values of Epistomina and delta C-13 values of all studied foraminifera from isotope equilibrium.
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
(2021)
Article
Geology
Madani Benyoucef, Mariusz Salamon, Bruno Ferre, Imad Bouchemla, Rafika Slami, Martina Kocova Veselska
Summary: Thorough sedimentological and palaeontological analyses of four expanded Upper Cretaceous sections in northern Tademait have led to a reconsideration of the stratigraphical framework of the 'Continental Intercalary' and 'Hamada series' in this Saharan area. The studied sections document Upper Cretaceous strata, including clastic formations and various member units, and provide valuable insight into the bio-chronostratigraphical correlations in the region. This research contributes to a better understanding of the sedimentary development and sea level rise during the early Late Cretaceous in North Africa.
CRETACEOUS RESEARCH
(2023)
Article
Geology
Andrew Scott Gale, Jenny Marie Rashall, William James Kennedy, Frank Koch Holterhoff
Summary: The stratigraphy of the upper Fredericksburg and lower Washita groups in northern Texas and southern Oklahoma is described in the paper, along with biostratigraphical correlation using microcrinoids, ammonites, planktonic foraminiferans, and inoceramid bivalves. The taxonomy of roveacrind microcrinoids is revised, new species and formae are described, and a new roveacrinid zonation for the middle and upper Albian (zones AlR1-12) is proposed, showing rapid speciation.
ACTA GEOLOGICA POLONICA
(2021)
Article
Geology
Martin Kostak, Frank Wiese, Zuzana Kozlova, Adam Culka, Martin Mazuch, Martin Soucek
Summary: A well-preserved fossil of an upper Cretaceous acanthoceratoid ammonite has been discovered in the Bohemian Cretaceous Basin, providing important insights into the jaw anatomy of these extinct organisms.
CRETACEOUS RESEARCH
(2024)
Article
Geology
Jean-Louis Latil, Etienne Jaillard
Summary: This study investigates the phylogeny of knemiceratids and acanthohoplitinids in the Chott Basin of southern Central Tunisia and describes five new ammonite species, highlighting the endemic character of the ammonite faunas in this region.
CRETACEOUS RESEARCH
(2024)
Article
Biodiversity Conservation
Amane Tajika, Neil H. Landman, Hiromichi Koyasu, Amy Broussard, Lian Anderson, Kenji Ikuno
Summary: This study documents 24 specimens of Rhyncholites and 12 specimens of Conchorhynchs from the Upper Cretaceous Mount Laurel Formation in Delaware. Morphometric analysis reveals that some morphological parameters in Rhyncholites are correlated with size, and the specimens exhibit high intraspecific variation.
AMERICAN MUSEUM NOVITATES
(2023)
Review
Geology
J. R. Ovando-Figueroa, J. A. Moreno-Bedmar, M. Company, J. A. Jacobo-Delgado
Summary: This article presents a review of ammonoid specimens from the Berriasian and Valanginian age in Zacatecas, Mexico. The study includes updated museographic information, new images, and 3D models of the specimens. Taxonomic identification has revealed six species and two genera. Stratigraphic range data suggests that the specimens belong to the uppermost upper Berriasian to lower Valanginian interval, with several biozones identified. Additionally, a paleobiogeographic analysis indicates a clear affinity with contemporaneous ammonoid assemblages from the Mediterranean region.
CRETACEOUS RESEARCH
(2024)
Article
Multidisciplinary Sciences
Marcin Machalski, Krzysztof Owocki, Zofia Dubicka, Oksana Malchyk, Weronika Wierny
Summary: The study focuses on the evolutionary lineage of a scaphitid lineage from a Late Cretaceous chalk succession in Poland, analyzing stable isotope data and predation marks on specimens to understand depth preferences. The research suggests that older subspecies led a pelagic lifestyle while younger subspecies preferred a nektobenthic lifestyle, possibly in response to local sea level changes. This challenges previous assumptions of stable depth preferences in ammonoids and suggests they may have been more flexible in behavior than previously thought.
SCIENTIFIC REPORTS
(2021)
Article
Geosciences, Multidisciplinary
Mikhail A. Rogov, Oleg A. Lutikov
Summary: This study described an in situ molluscan assemblage from the lower Toarcian deposits on Svalbard, which is dominated by ammonites and has fewer belemnites and bivalves. The distribution patterns of ammonites and bivalves suggest bilateral molluscan immigrations via the Greenland-Norwegian seaway during the late early Toarcian.
NORWEGIAN JOURNAL OF GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Mikhail A. Rogov, Oleg A. Lutikov
Summary: Diverse microfossil assemblages are found in the Lower Jurassic deposits on Svalbard, and macrofossils were previously known only from re-deposited phosphorite pebbles. This study describes a unique in situ molluscan assemblage dominated by ammonites in the lower Toarcian part of the Agardhbukta section. Ammonites belong to a new species and their findings characterize a new biohorizon.
NORWEGIAN JOURNAL OF GEOLOGY
(2022)
Article
Geology
Zdenek Vasicek, Dragoman Rabrenovi, Petr Skupien, Barbara Radulovi
Summary: A rich ammonite fauna was collected from the Dedina section in the Serbian Dacia Megaunit. The fauna consists of 10 genera with 17 species, including four aptychi species. The ammonites belong to four suborders, and the presence of Pseudosubplanites grandis suggests a correlation with the Grandis ammonite Subzone in the upper Berriasian.
CRETACEOUS RESEARCH
(2023)
Article
Geology
Etienne Jaillard, Jean-Louis Latil, Jean-Pierre Masse, Rabaa Hfaiedh
Summary: The detailed study of sedimentology and biostratigraphy in the Chott area, southern Central Tunisia, identifies several well-dated depositional sequences in the upper Aptian-Albian series. The upper Aptian sequences show a transition from shallow marine evaporitic deposits to clastic deposits and yield latest Aptian ammonites. The boundary between the Aptian and Albian is suggested to have a long-lasting hiatus and a change from clastic to carbonate deposits. The Albian transgression is expressed by the Knemiceras Beds, which can be correlated with the lower Albian in Central Tunisia based on new ammonite findings. The Knemiceras beds exhibit five distinct morphologies of Knemiceras sp. The overlying massive shelf carbonates are assigned to the uppermost lower Albian and correlated with the Allam Limestone of Central Tunisia. The carbonates are capped by a major discontinuity, correlated with a middle Albian discontinuity in Central Tunisia. The study presents and illustrates the ammonites and rudists fauna found in the area.
CRETACEOUS RESEARCH
(2022)
Article
Geology
Jacek Grabowski, Andrzej Chmielewski, Izabela Ploch, Mikhail Rogov, Jolanta Smolen, Patrycja Wojcik-Tabol, Krzysztof Leszczynski, Katarzyna Maj-Szeliga
Summary: The Jurassic-Cretaceous epicontinental Polish Basin was influenced by both Tethyan and Sub-boreal/Boreal palaeogeographic provinces, leading to complex faunal exchange and interaction of palaeoclimatic factors. This study aimed to determine palaeoclimatic changes in the J/K boundary interval in the Kcynia IG 2 borehole in central Poland. The results show a humid climate in the Early Tithonian and Late Berriasian, with aridification spreading in the late Tithonian to early Berriasian.
NEWSLETTERS ON STRATIGRAPHY
(2021)
Article
Geology
Kseniia Vasileva, Oleg Vereshchagin, Victoria Ershova, Mikhail Rogov, Irina Chernyshova, Irina Vishnevskaya, Tatiana Okuneva, Boris Pokrovsky, Marianna Tuchkova, Natalia Saphronova, Yuri Kostrov, Eduard Khmarin
Summary: The study reveals that glendonites are pseudomorphs after calcium carbonate hexahydrate and can serve as indicators of past cold climates. Multi-proxy analysis of samples from Sakhalin Island shows a complex mineral composition of glendonites, with isotopic values indicating seawater as the main oxygen source. The influence of continental runoff on isotopic composition and the rare earth element patterns suggest growth and replacement of ikaite occurred close to the aerobic-anaerobic boundary.
Article
Geochemistry & Geophysics
I. Panchenko, I. D. Sobolev, M. A. Rogov, A. Latyshev
Summary: The altered ash tuff and tuffite layers in the Jurassic-Cretaceous boundary rocks of the Bazhenovo Formation were studied in detail, revealing their importance as marker horizons and isochronous stratigraphic levels. The composition of the ash layers, likely originating from arc volcanism beyond the West Siberian Plate, provides valuable information for regional stratigraphy and global correlation. The tuff layers studied can potentially be traced in both Boreal and Tethyan successions, with zircons found in the tuffs useful for U-Pb dating.
LITHOLOGY AND MINERAL RESOURCES
(2021)
Article
Geosciences, Multidisciplinary
Kseniia Vasileva, Nataliya Zaretskaya, Victoria Ershova, Mikhail Rogov, Lisa D. Stockli, Daniel Stockli, Vadim Khaitov, Fedor Maximov, Irina Chernyshova, Natalia Soloshenko, Nikolay Frishman, Taras Panikorovsky, Oleg Vereshchagin
Summary: This study examines glendonites from the White Sea and sheds new light on the paleogeographic and geochemical environments during their formation. The findings show that White Sea glendonites are the youngest known glendonites and can be used as a proxy for near-freezing bottom water temperatures during the cold winter months.
Article
Geochemistry & Geophysics
Victoria Ershova, Andrei Prokopiev, Daniel Stockli, Mikhail Kurapov, Natalia Kosteva, Mikhail Rogov, Andrei Khudoley, Eugeny O. Petrov
Summary: The study of the Mesozoic succession in Franz Josef Land has provided new insights into the stratigraphy and geological history of the Arctic region. Analysis of pebbles and cobbles from conglomerates suggests the presence of pre-Mesozoic metasandstones intruded by Late Paleozoic granites and overlain by Carboniferous-Permian sedimentary deposits in the NE Barents Sea. The age analysis of detrital zircons reveals Precambrian to Early Mesozoic grains, with a significant Late Triassic exhumation event. Comparisons with other Arctic regions suggest an active sediment supply across the Barents Sea Basin during the Late Triassic-Jurassic, indicating significant tectonic activity and sediment transport pathways reorganization.
Article
Geosciences, Multidisciplinary
Mikhail Rogov, Victoria Ershova, Carmen Gaina, Oleg Vereshchagin, Kseniia Vasileva, Kseniia Mikhailova, Alexey Krylov
Summary: Ikaite is a metastable calcium carbonate hexahydrate that occurs naturally in cold water environments. Its suitability as a paleotemperature indicator is still debated. Using a global glendonite database, we reconstructed their distribution through geologic time and found that early Paleozoic glendonites were restricted to the Baltic paleobasin, while Carboniferous-Permian occurrences were associated with the Late Paleozoic Ice Age. Mesozoic glendonites were confined to polar or near-polar regions, and Paleogene-Neogene occurrences were found in the middle and high latitudes of the northern hemisphere.
EARTH-SCIENCE REVIEWS
(2023)
Article
Geosciences, Multidisciplinary
M. A. Rogov, I. V. Panchenko, L. E. Augland, V. B. Ershova, V. Yu. Yashunsky
Summary: This study provides the first reliable geochronological data from the West Siberia sedimentary basin to determine the age of the Tithonian/Berriasian (T/B) boundary. The dating of zircon grains derived from a tuff bed shows ages between 141.83 and 141.11 Ma, suggesting a re-consideration of the currently accepted age of the T/B boundary.
Article
Geology
D. N. Kiselev, M. A. Rogov
Summary: The study of new sections in the Upper Volgian substage near Vasilyevskoye village in Rybinsk district clarified the lower boundary and infrazonal division of the Volgidiscus singularis Zone. The lower part of the Singularis Zone was previously not characterized by ammonites, but this study established the sequence of craspeditins ammonites (Volgidiscus and Anivanovia) and identified a new Volgidiscus cf. lamplughi biohorizon. The lower boundary of the Singularis Zone in the Chudinovian Formation sections is determined by the first occurrence of Volgidiscus above the Craspeditesmilkovensis biohorizon. The infrazonal volume of the Singularis Zone is represented by three biohorizons: V. cf. lamplughi, V. pulcher, and V. singularis. Currently, the Singularis Zone has the most complete structure in the Panboreal Superrealm, making it a standard for the upper part of the Upper Volgian substage.
STRATIGRAPHY AND GEOLOGICAL CORRELATION
(2023)
Article
Biodiversity Conservation
Mikhail Rogov, Aleksandr Mironenko, Alexey Ippolitov, Oleg Lutikov
Summary: In this paper, the discovery of several coleoid jaws in the lower Toarcian black shales along the Vilyui River (Yakutia, Russia) is described. It is the first time that a Lower Jurassic coleoid jaw has been recorded outside Europe, and the first report of such a finding from the Mesozoic in Siberia. The preservation and morphology of the described coleoid jaws are similar to the coeval jaws previously reported from Europe, which is made possible by the widespread occurrence of black shale facies associated with the early Toarcian oceanic anoxic event (TOAE) in Siberia.
Article
Geology
Nikolay G. Zverkov, Mikhail A. Rogov, Viktor A. Zakharov, Igor G. Danilov, Dmitry Grigoriev, Martin Kostak
Summary: This study reports the first reptile remains found in the Upper Cretaceous marine strata of Siberia, including plesiosaurians, mosasaurids and turtles. These findings represent the northernmost occurrences of these reptile groups in the Cretaceous of Eurasia. The discovery of plesiosaurians suggests that the Arctic Polar Circle may have served as a birth and nursery area for these reptiles during the polar summer.
CRETACEOUS RESEARCH
(2023)
Article
Geosciences, Multidisciplinary
Mikhail A. Rogov, Oleg A. Lutikov
Summary: Diverse microfossil assemblages are found in the Lower Jurassic deposits on Svalbard, and macrofossils were previously known only from re-deposited phosphorite pebbles. This study describes a unique in situ molluscan assemblage dominated by ammonites in the lower Toarcian part of the Agardhbukta section. Ammonites belong to a new species and their findings characterize a new biohorizon.
NORWEGIAN JOURNAL OF GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
Mikhail A. Rogov, Oleg A. Lutikov
Summary: This study described an in situ molluscan assemblage from the lower Toarcian deposits on Svalbard, which is dominated by ammonites and has fewer belemnites and bivalves. The distribution patterns of ammonites and bivalves suggest bilateral molluscan immigrations via the Greenland-Norwegian seaway during the late early Toarcian.
NORWEGIAN JOURNAL OF GEOLOGY
(2022)
Article
Geosciences, Multidisciplinary
N. M. M. Janssen, M. A. Rogov, V. A. Zakharov
Summary: This study describes the discovery of Ryazanian (Berriasian) macrofossils in the Central Graben and on the J AE ren High in the southern North Sea region. The macrofossils mainly consist of buchiid bivalves and ammonites, with the genus Lynnia recorded for the first time outside its typical area. The stratigraphic ranges of key ammonite genera are reconsidered, and the distribution differences of ammonites and bivalves are hypothesized to be the result of anoxic bottom water conditions in the southern Viking Strait.
NETHERLANDS JOURNAL OF GEOSCIENCES-GEOLOGIE EN MIJNBOUW
(2022)
Article
Geosciences, Multidisciplinary
Thomas Letulle, Guillaume Suan, Mathieu Daeron, Mikhail Rogov, Christophe Lecuyer, Arnauld Vincon-Laugier, Bruno Reynard, Gilles Montagnac, Oleg Lutikov, Jan Schlogl
Summary: Periods of high atmospheric CO2 levels in the past were associated with high polar temperatures and reduced latitudinal gradients. This study reconstructs marine temperatures during the Early Jurassic using isotope analysis of mollusc shells, showing that polar temperatures were 10-20 degrees Celsius higher than present, with reduced latitudinal gradients. These findings provide important constraints for modeling Jurassic temperatures and suggest that high climate sensitivity has been a hallmark of greenhouse climates for at least 180 million years.
CLIMATE OF THE PAST
(2022)
Article
Geosciences, Multidisciplinary
Mikhail A. Rogov, Julia N. Savelieva, Olga Shurekova
Summary: The study of Upper Jurassic deposits near the village of Valy in the Syzran district, Samara region, reveals a detailed biostratigraphic analysis with the identification of zones, subzones, and biohorizons. The findings include the establishment of specific zones in different periods of the Upper Jurassic, as well as the discovery of unique fossilized corals and warm-water taxa in certain layers, suggesting deposition during short-term warming events. The analysis also provides insights into the paleo-ecological conditions of the region, indicating sediment accumulation in warm shallow eutrophic basins with gradual changes in eutrophy over time.
VESTNIK OF SAINT PETERSBURG UNIVERSITY EARTH SCIENCES
(2021)
