Alexander Sizov

Russian Academy of Sciences | RAS · Laboratory of Quaternary Stratigraphy

The new basal ursine bear, Ballusia zhegalloi n. sp., is described from the Early Miocene Tagay 1 locality (Baikal region, Russia) based on isolated M1. Previously described maxillary fragment with M1-2 from the closely synchronous fauna of Khirgis-Nur I in Mongolia, originally referred to Ballusia elemensis, is here included into the new species....

An additional anterior caudal vertebra of a titanosaurian sauropod Tengrisaurus starkovi from the Lower Cretaceous (Barremian–Aptian) Murtoi Formation of Transbaikalia, Asiatic Russia, reveals new morphological details of this taxon. The new characters include dorsoventrally compressed cotyle and condyle of the centrum and a prominent ridge separat...

The revised dinosaur assemblage from the Lower Cretaceous Murtoi Formation at Mogoito locality in Transbaikalia, Russia, includes lithostrotian titanosaur Tengrisaurus starkovi known from caudal vertebrae, Sauropoda indet. represented by isolated teeth and metatarsal IV, theropods Ornithomimosauria, Therizinosauria, Dromaeosauridae, Theropoda indet...

The Early Cretaceous topographic evolution of Transbaikalia was largely governed by the tectonic evolution of the Mongol-Okhotsk orogen. The collapse of the Mongol-Okhotsk orogen triggered the formation of metamorphic core complexes and associated extensional basins, widespread throughout Transbaikalia, North Mongolia, and North China. Numerous lit...

The Great Lakes Depression in northwestern Mongolia contains widespread Late Neogene continental deposits, reaching thicknesses of several hundred metres. The Late Neogene Khyargas Nuur formation (also known as the Khirgis-Nur formation) has a significant biostratigraphic value for Central Asia, as it encompasses a unique palaeontological record an...

Fluviatile deposits of the Krutaya Gorka regional formation host a new locality of Early Pliocene continental biota from southern Western Siberia. The Novaya Livenka site provides important data on palynology, paleocarpology, molluscs, fishes, and small mammals, mostly coming from a single fossiliferous bed. This study is the first successful insig...

An Erratum to this paper has been published: https://doi.org/10.1134/S1028334X23070322

The paper describes fossil birds from the Early Pleistocene (Gelasian) of Malye Goly locality in the Baikal area of the East Siberia (Irkutsk Region, Russia). This is the first studied bird fauna from the Early Pleistocene of the Northern Asia, shedding the first light on the early Quaternary bird associations of the Siberia. A tiny fossil duck Sib...

Описывается новое местонахождение Кимильтей, Иркутская область, где в массе захоронились неминерализованные остатки членистоногих. Изотопное U–Pb-датирование детритовых цирконов из слоя с фоссилиями указывает на их кембрийский возраст 491 ± 6 млн лет. Членистоногие в Кимильтей представлены Chasmataspidida, Synziphosurina и Euthycarcinoidea. Две пос...

A new locality Kimiltei, Irkutsk oblast, where unmineralized remains of arthropods were buried en masse, is described. The U–Pb zircon dating yielded a Cambrian age with the youngest values of 492±4 Ma. Kimiltei arthropods are represented by Chasmataspidida, Synziphosurina, and Euthycarcinoidea. The last two groups have not been known in the Siberi...

Hippo-like rhinocerotids, or teleoceratines, were a conspicuous component of Holarctic Miocene mammalian faunas, but their phylogenetic relationships are widely under-investigated. Excavations in lower Miocene deposits of the Olkhon Island (Tagay locality, Eastern Siberia; 16-18 Ma) have opened a unique window on the poorly-known early history of t...

The paper presents petrographic, geochemical, and new U-Pb zircon (LA-ICP-MS) geochronological data on the Upper Lena Fm. sediments which make part of the Cambrian sedimentary cover of the Siberian craton. The composition of lithic fragments in these clastic sediments, including mafic and felsic volcanics and granitoids, along with the correlation...

Представлены результаты исследования карбонатных кутан (натеков), cформированных на нижних поверхностях галечниковых включений в отложениях голоцен-верхнеплейстоценового возраста на территории Иркутско-Черемховской равнины. Новообразования сформированы в процессе выщелачивания карбонатов из вышележащих отложений в ходе педогенеза. Кутаны сложены чи...

We present results of study of carbonate coatings formed at the lower surfaces of pebble inclusions in Holocene–Upper Pleistocene deposits of the Irkutsk–Cheremkhovo plain. The coatings resulted from the leaching of carbonates from the overlying deposits during pedogenesis. They are composed of pure and magnesian calcite with minor inclusions of q...

The article contains preliminary data on faunal remains from the cave Graninskaya located in Transbaikal. We recognised nine mammal taxa. The predominance of the bones of Capreolus pygargus was revealed. Also we made biological and archaeozoological characteristics of the bones: measurements for bones are given, bones modified by humans are counted...

В 2008 года после полувекового перерыва (Китайник, Иваньев, 1958; Иваньев, 1960,Логачев и др., 1964) возобновлены тематические палеонтологические исследования наместонахождении Тагай-1 (переход от раннего к среднему миоцену, MN5, о. Ольхон, оз.Байкал). Это одно из немногочисленных мест России, где обнаружена анхитериевая фау-на. В результате раскоп...

New material on anchithere is described from Miocene of Eastern Siberia (Tagay locality, Olkhon Island, Lake Baikal). Based on the structure of teeth and postcranial bones, the Baikalian record is referred to the widespread Eurasian species Anchitherium aurelianense. This form shows low crowned lophodont type teeth without cement. Metaloph is mostl...

We present the results of geological-stratigraphic and paleontological research of Tagay 1 that situated in the Siberia on Olkhon Island (Lake Baikal). Over the last few years, this site attracts considerable attention. The excavation started in 2008. We studied the stratigraphic column and taphonomy of the site and allocated some different bone la...

Progress in the study of Miocene vertebrates of Tagay locality (Olkhon Island, Lake Baikal)

Lingham-Soliar questions our interpretation of integumentary structures in the Middle-Late Jurassic ornithischian dinosaur Kulindadromeus as feather-like appendages and alternatively proposes that the compound structures observed around the humerus and femur of Kulindadromeus are support fibers associated with badly degraded scales. We consider thi...

Middle Jurassic to Early Cretaceous deposits from northeastern China have yielded varied theropod dinosaurs bearing feathers. Filamentous integumentary structures have also been described in ornithischian dinosaurs, but whether these filaments can be regarded as part of the evolutionary lineage toward feathers remains controversial. Here we describ...

The biostratigraphic study of a new Upper Cenozoic reference section in the Tunka rift valley (southwestern Baikal region) accompanied by radiocarbon measurements made it possible to date its lithological units. It is established that the section is largely composed of Upper Pleistocene fluvial sediments resting with distinct angular unconformity u...