Cambrian section in the east of the West Siberian geosyneclise (<i>based on data from Vostok 4 well</i>)

Конторович, А. Э.; Kontorovich, Vladimir; Korovnikov, I. V.; Saraev, S.V.; Сенников, Н В; Filippov, Yu. F.; Варламов, А.И.; Efimov, A.S.; Filiptsov, Yu. A.; Postnikov, A. A.; Терлеев, А. А.; Karlova, G. A.; Nagovitsin, Konstantin; Токарев, Д. А.; Baturina, T.P.; Gubin, I.A.; Кочнев, Б. Б.; Novozhilova, N. V.; Luchinina, V. A.

doi:10.1016/j.rgg.2012.08.002

Cited by 10 publications

(1 citation statement)

References 2 publications

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“…The Oksym Formation, age analog of the Usolka Formation, is detected in the section of the Vostok-4 well, interval of 4570-5105 m (Filippov et al, 2014;Kontorovich et al, 2012). Unlike the Usolka Formation, it is predominantly of anhydrite-carbonate composition and does not contain rock salt.…”

Section: Structure Of Sections and Lithologymentioning

confidence: 99%

Lithologic and facies characteristics of the Lower Cambrian Usolka Formation and its age analogs in the Cis-Yenisei sedimentary basin, West Siberia

Saraev

2015

Russian Geology and Geophysics

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Based on the correlation between Lower Cambrian sections of deep wells on the left bank of the Yenisei River and outcrops in the westernmost Yenisei Ridge, the sedimentologic characteristics of the Usolka Formation and coeval deposits are compared. Three paleogeographic regions (subbasins) are distinguished in the Cis-Yenisei basin in Usolka time. The leading role in the sediment genesis was played by the region of barrier reefs stretching northwestward and northward as a ~70 km wide band to their joint with the reefs of the Igarka-Noril'sk facies region in the north. The salt basin east of the barrier reef ridge was a bay of the East Siberian salt basin, separated from the latter by the Yenisei paleoislands (at the place of the Yenisei Ridge). Sedimentation in that basin was controlled by evaporite processes, the supply of terrigenous material from the islands and carbonate debris from the opposite side (barrier reef), and the predominance of storm processes. The subbasin west of the barrier reefs evolved under different scenario. Since the Early Cambrian, a trough has been forming here, which was initially characterized by a regime of starvation and the first appearance of carbonaceous rocks (Lower Churbiga Subformation), regarded as Domanic oil source rocks, in the general Cambrian section. On the estimation of the prospects for the distribution of reservoirs whose origin depends on the facies regularities, the leading role is played by the barrier reef region. Importantly, the Lower Cambrian section of the Cis-Yenisei basin contains two large adjacent paleogeomorphologic structures and the corresponding facies zones of a starved prereef depression with the Domanic oil source rocks of the Lower Churbiga Subformation at the early stage of evolution and a potentially productive barrier reef system with a steep slope toward the basin. The favorable combination of these factors suggests that the Cis-Yenisei basin has a high petroleum potential.

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Section: Structure Of Sections and Lithologymentioning

confidence: 99%

Lithologic and facies characteristics of the Lower Cambrian Usolka Formation and its age analogs in the Cis-Yenisei sedimentary basin, West Siberia

Saraev

2015

Russian Geology and Geophysics

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Geometric morphometrics of macro- and meiofaunal priapulid pharyngeal teeth provides a proxy for studying Cambrian “tooth taxa”

Wernström,

Slater,

Sørensen

et al. 2023

Zoomorphology

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Priapulids are marine, benthic ecdysozoan worms that feed using a distinctive toothed pharynx. While only a handful of lineages have survived to the present day, the Cambrian priapulid stem group left behind a rich record of articulated body fossils and characteristic trace fossils in the form of burrows. Recently, the fossil record of isolated priapulid cuticular elements including pharyngeal teeth has gained increased attention as a means of revealing cryptic priapulid taxa otherwise unknown among macrofossils. In this study, we focus on the ecological implications of shape variation in the teeth of extant and extinct priapulids, which display substantial morphological differences between taxa and life stages. We define a landmarking scheme to capture shape variation in priapulid teeth and apply it to our dataset, which includes a breadth of tooth specimens from extant macrofaunal and meiofaunal lineages alongside numerous Cambrian priapulid teeth preserved as isolated small carbonaceous fossils. Through ordination of the principal components of shape, we explore the priapulid tooth morphospace and find evidence that its occupancy has expanded since Cambrian times, indicating a corresponding expansion of the group’s ecological niche. We also employ our geometric morphometric approach to make linear discriminant analysis-based taxon assignments based on tooth morphology, which can be helpful for classifying enigmatic “tooth taxa” known solely from fossil teeth. Finally, we use discriminant analysis to study tooth shapes from a functional perspective, considering known ecologies to characterize the ecological functions of unclassified isolated teeth.

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Animal origins: The record from organic microfossils

Slater

Bohlin

2022

Earth-Science Reviews

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Cambrian section in the east of the West Siberian geosyneclise (based on data from Vostok 4 well)

Cited by 10 publications

References 2 publications

Lithologic and facies characteristics of the Lower Cambrian Usolka Formation and its age analogs in the Cis-Yenisei sedimentary basin, West Siberia

Lithologic and facies characteristics of the Lower Cambrian Usolka Formation and its age analogs in the Cis-Yenisei sedimentary basin, West Siberia

Geometric morphometrics of macro- and meiofaunal priapulid pharyngeal teeth provides a proxy for studying Cambrian “tooth taxa”

Animal origins: The record from organic microfossils

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