Permian marine fauna of Northeastern Asia

© 2015, Pleiades Publishing, Ltd. The characteristics of the main biotic groups of the Permian marine basins of northeastern Asia are provided. They include nine animal phyla: sarcodines, sponges, cnidarians, arthropods, bryozoans, brachiopods, mollusks, echinoderms, and conodonts. The distribution of the fauna was nonuniform and controlled primarily by the depth of their habitats. Dominating groups were foraminifers, brachiopods, bivalves, and gastropods. The most diverse fauna inhabited the Omolon Basin, where almost all the above groups have been recorded. A distinctive feature of the Permian biota of northeastern Asia is wide distribution of bipolar taxa in all faunal groups

Discovery of Shallow-Marine Biofacies Conodonts in a Bioherm Within the Carboniferous-Permian Transition in the Omalon Massif, NE Russia near the North Paleo-Pole: Correlation with a Warming Spike in the Southern Hemisphere

The conodont genera Hindeodus and Streptognathodus are reported for the first time within the Carboniferous-Permian transition in the northern high latitudes of the Paren’ River, Omolon Massif, NE Russia. Several fossil groups, including brachiopods, bivalves, scaphopods and microgastropods were found to be prolific in the invertebrate-dominated bioherms. These bioherms occur within predominantly siliciclastic sequences with extremely poor fauna, whereas in the studied bioherms the diversity of the bivalves and brachiopods exceeded observed diversity elsewhere in coeval facies in NE Russia. The bioherms are biostratigraphically constrained as uppermost Pennsylvanian to lowermost Cisuralian based on ammonoids. The very unusual peak of bivalve and brachiopod diversity and the occurrence of conodonts that require minimum sea water temperatures of at least 10-12 °C indicate a short lived, but significant warming event at that time, at least of provincial significance. This event most likely corresponds with a short-lived warming event recently discovered in the east of the southern hemisphere, in Timor and Australia. Thus, the event is possibly of global significance

Biogeography of the Permian marine Boreal basins based on bivalves

© 2015, Pleiades Publishing, Ltd. The biogeography of Permian marine bivalves of the Boreal Superrealm is considered. Two biochores, the Western Boreal and Eastern Boreal realms, divided into a number of provinces are distinctly recognized. The Western Boreal Realm, which comprises the East European, West European, Greenland–Canadian, and Spitsbergen provinces, is distinguished by the widespread occurrence of pteriacians, myalinids, mitilids, Pseudomonotis, Cyrtorostra, and Netschajewia. The Eastern Boreal Realm comprises the Pechora, Novaya Zemlya, Taimyr, Verkhoyansk–Okhotsk, Kolyma–Omolon, Mongol–Transbaikalian, and Yukon provinces and is characterized by the widespread occurrence of Inoceramus-like bivalves of the family Kolymiidae and a high proportion of genera with bipolar distribution

New records of bipolar nuculanid bivalves of the genus Glyptoleda in the Permian of northeastern Asia

© 2016, Pleiades Publishing, Ltd.Geographical and stratigraphical ranges of the bipolar nuculanid bivalves of the genus Glyptoleda is considered. In the Boreal Biogeographical Superrealm, Glyptoleda is only known in the eastern (high boreal) part: in the Novaya Zemlya and Verkhoyansk–Okhotsk provinces. Glyptoleda is recorded for the first time in the Kolyma–Omolon Province. Possibly, the appearance of glyptoleds in the northern Eurasian basins was associated with cooling episodes. A new species, Glyptoleda parenica sp. nov., is described from the Kungurian–Roadian beds of the southeastern framing of the Omolon Massif

New Inoceramus-like bivalves of the genus Praekolymia Biakov from the Lower Permian of the western Verkhoyansk Region, northeastern Asia

© 2014, Pleiades Publishing, Ltd. Historical development of Permian Inoceramus-like bivalves of the genus Praekolymia Biakov endemic to the Verkhoyansk-Okhotsk and Kolyma-Omolon provinces is briefly considered. Two new earliest representatives of the genus (Praekolymia kaschirtzevi sp. nov. and P. barajensis sp. nov.) from the Lower Permian of the western Verkhoyansk are described

A new most ancient Permian Inoceramus-like bivalve of the genus Aphanaia Koninck from northeastern Asia

© 2015, Pleiades Publishing, Ltd. The most ancient representative of Permian Inoceramus-like bivalves, Aphanaia kletzi sp. nov., from the Upper Sakmarian of the Western Verkhoyansk Region (northeastern Asia) is described. It is established for the first time that the first kolymiids appeared in the northeastern Asian basins in the latter half of the Sakmarian rather than at the end of the Artinskian. The age of the record is reliably dated by the ammonoid genera Uraloceras and Neoshumardites

Discovery of shallow-marine biofacies conodonts in a bioherm within the Carboniferous-Permian transition in the Omolon Massif, NE Russia near the North paleo-pole: Correlation with a warming spike in the southern hemisphere

© 2014 . The conodont genera Hindeodus and Streptognathodus are reported for the first time within the Carboniferous-Permian transition in the northern high latitudes of the Paren' River, Omolon Massif, NE Russia. Several fossil groups, including brachiopods, bivalves, scaphopods and microgastropods were found to be prolific in the invertebrate-dominated bioherms. These bioherms occur within predominantly siliciclastic sequences with extremely poor fauna, whereas in the studied bioherms the diversity of the bivalves and brachiopods exceeded observed diversity elsewhere in coeval facies in NE Russia. The bioherms are biostratigraphically constrained as uppermost Pennsylvanian to lowermost Cisuralian based on ammonoids. The very unusual peak of bivalve and brachiopod diversity and the occurrence of conodonts that require minimum sea water temperatures of at least 10-12. °C indicate a short lived, but significant warming event at that time, at least of provincial significance. This event most likely corresponds with a short-lived warming event recently discovered in the east of the southern hemisphere, in Timor and Australia. Thus, the event is possibly of global significance

New records of the Late Carboniferous ammonoid genus Eoshumardites in the Kolyma–Omolon Region, and notes on the evolution of Eoshumarditidae

© 2016, Pleiades Publishing, Ltd.A new species, Eoshumardites popowi Kutygin sp. nov., is described from the Upper Carboniferous of the upper reaches of the Paren’ River in the Gizhiga Province of the Kolyma–Omolon Region. The ontogeny of the sutural and shell morphology of the new species is described. In the level of sutural organization, E. popowi occupies an intermediate position between E. lenensis (Popow) and E. sublenensis Klets. It has been suggested that Eoshumardites evolved from the genus Syngastrioceras rather than Aktubites and, on this basis, a new monotypic endemic family, Eoshumarditidae, has been proposed. This family existed in the Kasimovian synchronously with members of the family Parashumarditidae

Permian ammonoids of the Okhotsk Region, Northeast Asia

© 2015, Pleiades Publishing, Ltd. Beds with ammonoids are recognized as a result of the study of goniatitids and prolecanitids from the Nyut, Khuren, and Ayan-Yuryakh in the Okhotsk Region. Beds with Neopronorites tenkensis, assigned to the Upper Artinskian Substage, correspond to the upper part of the Echian Horizon of the Verkhoyansk Region. Beds with Paragastrioceras–Baraioceras characterize the middle part of the Kungurian Stage and correlate with the upper sunhorizon of the Tumarian Horizon of the Verkhoyansk Region. Beds with Sverdrupites harkeri correspond to a biostratigraphic subdivision with the same name widely distributed in the Vekhoyansk-Kolyma Region and assigned to the Roadian Stage. The new species Neopronorites tenkensis is described

Importance of carbon isotopic data of the Permian-Triassic boundary layers in the Verkhoyansk region for the global correlation of the basal Triassic layer

© 2015, Pleiades Publishing, Ltd. This paper is dedicated to a global correlation of marine Permian-Triassic boundary layers on the basis of partially published and original data on the δ13Corg and δ13Ccarb values of the Suol section (Setorym River, South Verkhoyansk region). The section consists of six carbon isotopic intervals, which are easily distinguishable in the carbon isotopic curves for a series of Permian-Triassic reference sections of Eurasia and Northern America, including paleontologically described sections of Central Iran, Kashmir, and Southern China. This suggests that the Permian-Triassic boundary in the Suol section is close to the carbon isotopic minimum of interval IV. In light of new data, we suggest considering the upper part of the Late Permian Changhsingian Stage and the lower substage of the Early Triassic Induan Stage of Siberia in the volumes of the rank Otoceras concavum zone and the Tompophiceras pascoei and Wordieoceras decipiens zones, respectively. The O. concavum zone of the Verkhoyansk region probably corresponds to the Late Changhsingian Hypophiceras triviale zone of Greenland. The carbon isotopic intervals II, III, IV, and V in the Permian-Triassic boundary layers of the Verkhoyansk region traced in a series of the reference sections of Eurasia correspond, most likely, to intensification of volcanic activity at the end of the Late Changhsingian and to the first massive eruptions of Siberian traps at the end of the Changhsingian and the beginning of the Induan Stages. New data indicate the possible survival of ammonoids of the Otoceratoidea superfamily at the species level after mass extinction of organisms at the end of the Permian