Papers by Tatiana Isakova
The Assemblage of Late Devonian Primitive Parathuramminids (Foraminifera) from Carbonate Deposits of the Mendeleev Rise, Eastern Arctic
Stratigraphy and Geological Correlation, Mar 1, 2021
The results of a paleontological and stratigraphic study of an assemblage of Paleozoic primitive ... more The results of a paleontological and stratigraphic study of an assemblage of Paleozoic primitive calcareous foraminifers from the central part of the Mendeleev Rise (Eastern Arctic) are presented. The obtained data allow us to refine and correct the age of strata containing these fossils. It is shown that the Parathurammina (s.l.) foraminifera are the most stratigraphically informative in this assemblage. The primitive foraminifers recorded in Sample 1601/8c from carbonate deposits of the central part of the Mendeleev Rise indicate the early Famennian time of formation of these deposits.
Paleontological Journal
Spravochnik po sistematike foraminifer paleozoya (endotiroidy, fuzulinoidy) (Reference Book on th... more Spravochnik po sistematike foraminifer paleozoya (endotiroidy, fuzulinoidy) (Reference Book on the Taxonomy of Paleozoic Foraminifers (Endothyroids, Fusulinoids)), Moscow: Nauka, 1996.
Geologicheskii vestnik
Изучены ассоциации фораминифер из нижнепермских отложений рифовых массивов Торатау, Куштау и Юрак... more Изучены ассоциации фораминифер из нижнепермских отложений рифовых массивов Торатау, Куштау и Юрактау. Определен их таксономический состав с учетом данных, ранее опубликованных предшествующими исследователями. Уникальной особенностью сообществ фораминифер (фузулинид и мелких фораминифер) Башкирских шиханов является неповторимый смешанный состав комплексов. В сообществах фораминифер присутствуют таксоны как широко латерально распространенные, так и эндемики; как виды северных акваторий, так и виды области Палеотетис. Таксономический состав фораминифер включает свыше 50 родов и более 180 видов. Приведена краткая характеристика стратиграфической приуроченности определенных родов и видов фораминифер в ассельско-артинских отложениях, слагающих рифовые массивы, а также основные сведения об условиях и образе жизни фораминифер. The foraminiferal assemblages from the Lower Permian deposits of the Toratau, Kushtau, and Yuraktau reef massifs were studied. Their taxonomic composition was determi...
Geologicheskii vestnik, 2020
Реферат. Приведены результаты комплексного палеонтологического исследования микро-и макрофауны из... more Реферат. Приведены результаты комплексного палеонтологического исследования микро-и макрофауны из пограничных сакмарско-артинских отложений разреза «Дальний Тюлькас», который претендует на роль Глобального стратотипа нижней границы («золотого гвоздя») артинского яруса пермской системы Международной стратиграфической шкалы. Изучено распространение по разрезу конодонтов, аммоноидей и фораминифер. Нижняя граница артинского яруса проведена по появлению космополитного вида Sweetognathus whitei (Rhodes) в эволюционной линии S. binodosus-S. anceps-S. whitei. Выше сакмарско-артинской границы обнаружен типичный для нижнеартинского (актастинского) подъяруса комплекс аммоноидей с Daraelites, Eothinites, Popanoceras, а также Neopronorites skvorzovi (Tchernow), Uraloceras involutum (Voinova), U. gracilentum Ruzhencev и Popanoceras annae Ruzhencev, являющихся маркерами сакмарско-артинского рубежа. В разрезе впервые выделены слои с Uraloceras involutum. Послойно показано распределение характерных шубертелло-фузулинидовых комплексов и комплексов мелких фораминифер по разрезу. Проанализировано изменение таксономического состава фораминифер во времени. Ключевые слова: пермская система, сакмарский ярус, артинский ярус, конодонты, аммоноидеи, фораминиферы, Международная стратиграфическая шкала PALEONTOLOGICAL CHARACTERISTICS OF THE "DALNIY TYULKAS" SECTION (SOUTHERN URALS)
Global Stratotype Section and Point (GSSP) for the base-Artinskian Stage (Lower Permian)
Episodes
New species of small foraminifers from the Mechetlino Quarry section (Southern Urals, Russia): a potential candidate for the GSSP of the lower boundary of the Global Kungurian Stage
Palaeontologische Zeitschrift, Mar 26, 2022
Four new species of small foraminifers, Hemigordius infantem sp. nov., Pseudoammodiscus valeryi s... more Four new species of small foraminifers, Hemigordius infantem sp. nov., Pseudoammodiscus valeryi sp. nov., Nodosaria septumlamellosa sp. nov., and N. zebra sp. nov., are described from strata near the Artinskian/Kungurian boundary in sections of the Southern Urals (Mechetlino Quarry), Middle Urals (Kamayskiy Log), Preuralian Foredeep, and the Sol-Iletsk Swell (boreholes of the Nagumanovskaya Field), Russia. High morphological variability of Hemigordius infantem sp. nov. is noted. It is shown that lateral thickenings and wall structure may not be preserved as a result of subsequent lithification processes. The lumen shape of the last whorl and test morphology are more constant features for all specimens of Hemigordius infantem sp. nov. The high variability of dimensions of H. infantem sp. nov. and Pseudoammodiscus valeryi sp. nov. is clearly seen in the binary discriminative diagrams of the dependence of some features of the tests depending on the number of whorls (test size and proloculus diameter). For the first time, the appearance of species of Nodosaria with a multilayered, poly- or plesiomonolamellar wall have been noted in the upper Artinskian deposits in the Urals. Such a wall is known only in Artinskian and Kungurian deposits in the Urals, and in Artinskian, Kungurian, and Kazanian deposits of the north and northeast of Russia. The appearance of this feature may be a good marker of the upper Artinskian (upper part of the Sarginian), Neostreptognathodus pequopensis Conodont Zone, near Artinskian/Kungurian boundary.
Gzhel section. Stratotype of Gzhelian Stage
Geologicheskii vestnik
Рифовый массив Шахтау является уникальным объектом изучения раннепермской морской биоты. Массив р... more Рифовый массив Шахтау является уникальным объектом изучения раннепермской морской биоты. Массив расположен в окрестностях г. Стерлитамак на правобережье р. Белой и широко известен как одна из Стерлитамакских гор-одиночек или шиханов. Шиханы как геологические объекты вызывали интерес у отечественных и зарубежных геологов и неоднократно посещались многими естествоиспытателями разных поколений. История накопления знаний о геологии, стратиграфии, палеонтологии шиханов подробно представлена Д.М. Раузер-Черноусовой [1950], начиная с геологических исследований Стерлитамакских гор-одиночек Мурчисоном [Murchison et al., 1845] в XIX веке и заканчивая исследованиями, проводившимися до середины ХХ века большим коллективом геологов, стратиграфов и литологов Академии наук СССР. История изучения рифового массива Шахтау до 1985 г. подробно изложена И.К. Королюк [1985]. В настоящее время Шахтау является наиболее известным
Biostratigraphy of the Carboniferous in the Moscow Syneclise, Russia
Paleontological analysis and comparison of the Moscovian/Kasimovian boundary beds in the Moscow Basin (Russia) and in the Cantabrian Mountains (Spain)
Geologicheskii vestnik, 2018
Реферат. Приведена палеонтологическая характеристика пограничных артинско-кунгурских отложений ра... more Реферат. Приведена палеонтологическая характеристика пограничных артинско-кунгурских отложений разреза Мечетлино. Описаны основные группы фауны (конодонты, аммоноидеи, фораминиферы, рыбы, брахиоподы, трилобиты); рассмотрено эволюционное развитие родов конодонтов и аммоноидей. Детально показано распределение характерных комплексов по разрезу, проанализировано их изменение во времени. Ключевые слова: разрез Мечетлино, пермская система, артинский ярус, кунгурский ярус, конодонты, аммоноидеи, фораминиферы, GSSP кунгурского яруса
地质幕 英文版, 2008
We propose that the level at which the conodont species Idiognathodus simulator (Ellison 1941) (s... more We propose that the level at which the conodont species Idiognathodus simulator (Ellison 1941) (sensu stricto) first appears be selected to mark the base of the Gzhelian Stage, because we believe that this is the optimal level by which this boundary can be correlated. This taxon has a short range and a wide distribution, as shown by correlation of glacial-eustatic cyclothems across the Kasimovian-Gzhelian boundary interval among Midcontinent North America and the Moscow and Donets basins of eastern Europe, based on scale of the cyclothems along with several aspects of biostratigraphy. Outside of these areas, I. simulator (sensu stricto) is known also from other parts of the U.S., and is reported from the southern Urals and south-central China in its expected position between other widespread taxa. Its first appearance is consistent with the current ammonoid placement of the boundary (first appearance of Shumardites cuyleri), and it is also compatible with certain aspects of the distribution of Eurasian fusulinid faunas (e.g., lectotype of Rauserites rossicus).
Multidisciplinary study of the Mechetlino Quarry section (Southern Urals, Russia) — the GSSP candidate for the base of the Kungurian Stage (Lower Permian)
Palaeoworld
Dynamics of development of the small foraminiferal biota during early Kungurian (Permian) as evidenced from the Chikali section, Middle Urals, Russia
Revue de Micropaléontologie
Evolution of the late carboniferous foraminiferal genus Fusiella Lee et Chen (Fusulinida)
Paleontological Journal, 2013
Lower Moscovian Conodonts and Fusulinids: The Position of the Lower Boundary of the Moscovian Stage (Pennsylvanian)
STRATI 2013, 2014
“Sub-Triticites Beds” of the Donskaya Luka and lower boundary of the Kasimovian Stage
Stratigraphy and Geological Correlation, 2009
ABSTRACT Micro- and macrofauna remains were studied from transitional deposits of Moscovian and K... more ABSTRACT Micro- and macrofauna remains were studied from transitional deposits of Moscovian and Kasimovian Stages in the Donskaya Luka (Volgograd Region). The preliminary analysis of microfauna showed that “sub-Triticites Beds” of the Donskaya Luka contain fusulinid and conodont assemblages enabling correlation of the Middle and Upper Carboniferous deposits in the study region with the type sections of Moscow area and Donbass. Conodonts from the “sub-Triticites Beds” stratotype were studied for the first time. As is established, upper part of the Sukhov Fm. and the base of the Seleznev Fm. belong to the Protriticites pseudomontiparus-Obsoletes obsoletus Zone. Based on fusulinids, higher parts of the Seleznev Fm. belong to the Montiparus Zone of the Khamovnikian Substage, whereas conodonts suggest their correlation with lower part of the Khamovnikian Substage, i.e., with the Ratmirovo Fm. or a basal part of the Neverovo Fm. Middle part of the Seleznev Fm. is correlated to middle cycle of the Neverovo Fm. of the Khamovnikian Substage in Moscow area. The Middle-Upper Carboniferous boundary deposits of the Donskaya Luka are represented by deposits of extremely shallow-water settings and contain only sporadic microfauna. These sections cannot be considered as possible candidates for the GSSP of the Kasimovian Stage base.
Palaeoworld, 2009
The Afanasievo Quarry, approximately 90 km southeast of Moscow and about 5 km southwest of Voskre... more The Afanasievo Quarry, approximately 90 km southeast of Moscow and about 5 km southwest of Voskresensk, starts with Late Moscovian limestone of the Peski Formation, which is overlain by shallow-water carbonates of the Krevyakinian Horizon (Substage) (Suvorovo and Voskresensk formations) and the lower part of the Khamovnikian Horizon (Substage) (Ratmirovo and Neverovo formations). These rocks were formed under the strong influence of glacio-eustatic sea-level fluctuations and are separated by the palaeosol horizons and minor stratigraphic gaps. The Moscovian-Kasimovian transition interval contains fusulinids, brachiopods, bryozoans, corals, and conodonts. It was recently proposed . Report of the Task Group to establish GSSPs at the Moscovian-Kasimovian and Kasimovian-Gzhelian boundaries. Newsletter on Carboniferous Stratigraphy 23, 9-10] that the appearance of the conodont Idiognathodus sagittalis Kozitskaya is one of the best markers for definition of the base of the Kasimovian on the global chronostratigraphic scale. The first appearance of this species is 2 m above the base of Neverovo Formation, and is close to the first appearance of the fusulinid Montiparus in the section. The possible ancestor of I. sagittalis occurs in the lower Suvorovo Formation, but is more abundant and more advanced in the middle to upper parts of the Voskresensk Formation. This lineage has potential for defining a GSSP at the first appearance of I. sagittalis.
Palaeoworld, 2009
Studies carried out for more than 10 years by the Task Group to establish GSSPs at the base of th... more Studies carried out for more than 10 years by the Task Group to establish GSSPs at the base of the Moscovian-Kasimovian and Kasimovian-Gzhelian boundaries have resulted in the proposal that the level at which the conodont species Idiognathodus simulator first appears be selected to mark the base of the Gzhelian Stage. This expands this eastern European chronostratigraphic unit to a global scale.
The main objects of the underground study in the Moscow region are limestone mines. Gallery syste... more The main objects of the underground study in the Moscow region are limestone mines. Gallery systems, many kilometers-long, formed as a result of extraction of building material (limestone) for the construction of White-Stone Moscow.
The main issues in the study of the quarries as a unique historical monuments are: 1. Dates and stages of mining of individual parts of the mine systems; 2. Matching of stone from mines with existing buildings and monuments; 3. Determination of the main stages of the use of white stone in the region; 4. Conservation and restoration of limestone buildings and monuments.
To resolve these problems, we used methods of physical chemistry and paleontology. The originality of the developed procedure consists of using an integrated approach of scientific methods which complement and correct results. As a part of the paleontological method we studied the micro-organisms which formed every limestone sample, namely foraminifera and fusulinida - unicellular organisms that possessed limestone shells of various shapes, and their generic and species diversity. As a part of the physic-chemical method we studied and compared the chemical composition of limestone samples by qualitative and quantitative powder X-ray diffraction analysis and X-ray fluorescent analysis.
At present time our main job is the development of the procedure which may be used and making the database which will be open to use for other researches.
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Papers by Tatiana Isakova
The main issues in the study of the quarries as a unique historical monuments are: 1. Dates and stages of mining of individual parts of the mine systems; 2. Matching of stone from mines with existing buildings and monuments; 3. Determination of the main stages of the use of white stone in the region; 4. Conservation and restoration of limestone buildings and monuments.
To resolve these problems, we used methods of physical chemistry and paleontology. The originality of the developed procedure consists of using an integrated approach of scientific methods which complement and correct results. As a part of the paleontological method we studied the micro-organisms which formed every limestone sample, namely foraminifera and fusulinida - unicellular organisms that possessed limestone shells of various shapes, and their generic and species diversity. As a part of the physic-chemical method we studied and compared the chemical composition of limestone samples by qualitative and quantitative powder X-ray diffraction analysis and X-ray fluorescent analysis.
At present time our main job is the development of the procedure which may be used and making the database which will be open to use for other researches.