The upper Viséan-Serpukhovian in the type area for the Serpukhovian Stage (Moscow Basin, Russia): Part 2. bulk geochemistry and magnetic susceptibility

The Visean–Serpukhovian boundary is not yet defined by a Global Stratotype Section and Point (GSSP) but it is recognizable operationally by the appearance of the conodont Lochriea ziegleri in the L. nodosa–L. ziegleri chronocline. Foraminiferal successions across this boundary in the type area of the Serpukhovian Stage (Moscow Basin, Russia), elsewhere in Russia and in the central United States suggest that the appearances of Asteroarchaediscus postrugosus, Janischewskina delicata, Eolasiodiscus donbassicus, and specimens controversially referred to “Millerella tortula” are reliable, auxiliary indices to the base of the Serpukhovian. In southern Guizhou Province, China, Visean–Serpukhovian rock sequences from slope and platform settings have yielded rich associations of conodonts and foraminifers, respectively. The Nashui section is a leading candidate for the Serpukhovian GSSP because its slope deposits contain an uninterrupted record of conodont occurrences including the L. nodosa–L. ziegleri transition. Foraminifers recovered from the Nashui section are comparatively rare and include none of the basal Serpukhovian indices. In contrast, the nearby Yashui section represents a platform interior setting in which foraminifers flourished and conodonts were nearly absent. The base of the Serpukhovian at Yashui is marked approximately by the appearance of “tortula-like” specimens. Although it is not possible to correlate biostratigraphically between the Nashui and Yashui sections, the occurrence of “tortula-like” specimens at the Yashui section allows correlation with the mid-Venevian Substage of the Moscow Basin at a level coinciding with the appearance of L. ziegleri. Together, the slope and platform sections comprise an informative biostratigraphic reference area for micropaleontologic characterization of the Visean–Serpukhovian boundary in southern Guizhou.

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The upper Viséan-Serpukhovian in the type area for the Serpukhovian Stage (Moscow Basin, Russia): Part 1. Sequences, disconformities, and biostratigraphic summary

Geological Journal ◽

10.1002/gj.2612 ◽

2014 ◽

Vol 51 (2) ◽

pp. 163-194 ◽

Cited By ~ 23

Author(s):

Pavel B. Kabanov ◽

Alexander S. Alekseev ◽

Nilyufer B. Gibshman ◽

Ruslan R. Gabdullin ◽

Aleksei V. Bershov

Keyword(s):

Type Area ◽

Moscow Basin ◽

Serpukhovian Stage

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Magnetic susceptibility and geochemical characterization of an upper Mississippian cyclothemic section Polotnyanyi Zavod, (Moscow Basin, Russia)

Geological Society London Special Publications ◽

10.1144/sp414.1 ◽

2015 ◽

Vol 414 (1) ◽

pp. 181-196 ◽

Cited By ~ 2

Author(s):

A. O. Alekseev ◽

P. B. Kabanov ◽

T. V. Alekseeva ◽

P. I. Kalinin

Keyword(s):

Magnetic Susceptibility ◽

Geochemical Characterization ◽

Moscow Basin

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ON THE POSITION OF THE BOUNDARY BETWEEN THE MOSCOVIAN AND KASIMOVIAN GLOBAL STAGES OF THE CARBONIFEROUS IN THE DONETS BASIN

Collection of Scientific Works of the Institute of Geological Sciences of the NAS of Ukraine ◽

10.30836/igs.2522-9753.2021.232114 ◽

2021 ◽

Vol 14 (1) ◽

pp. 63-71

Author(s):

Tamara I. Nemyrovska

Keyword(s):

Lower Boundary ◽

Donets Basin ◽

Present Position ◽

Precise Position ◽

Index Species ◽

Potential Index ◽

Type Area ◽

Extinction Event ◽

Moscow Basin ◽

Definition Of

Detailed new data on paleontology and stratigraphy were obtained in the process of fulfilling the tasks of the International Carboniferous Subcommission on definition of the scopes of the Moscovian and Kasimovian global stages and the precise position of the boundary between them. The analysis of these data has shown that the position of this boundary in the type area and in the other regions needs the revision. Recently the investigation of the conodonts from the Moscovian–Kasimovian boundary deposits in the Donets Basin revealed that the boundary between the Moscovian and Kasimovian stages in the official Ukrainian Carboniferous Stratigraphic Scheme does not correspond to this boundary in the type area of these stages in the Moscow Basin. To correct this situation the lower boundary of the Kasimovian in the Ukrainian Scheme must be downgraded by two conodont zones — Swadelina subexcelsa and Sw. makhlinae. To update this boundary in the type area to fulfill the task of the Carboniferous Subcommission four conodont species were proposed as potential index-species for the definition of the boundary between the Moscovian and Kasimovian global stages. These conodont species are as follows Sw. subexcelsa, Idiognathodus sagittalis, I. turbatus and I. heckeli. One of these species, which is selected, will be used as a marker of the studied boundary. None of these species is officially selected as a marker. If Sw. subexcelsa will be selected, the position of the Moscovian–Kasimovian boundary will remain at the present position. In this case this boundary in the Donets Basin has to be downgraded by two conodont zones. If one of three Idiognathodus will be selected, this boundary in the type area will be upgraded by one and a half regional substage. In the Donets Basin it will be upgraded by less than a cycle. Keywords: Carboniferous, stratigraphy, conodonts, extinction event, index-species.

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Serpukhovian Stage (Carboniferous) in type area: Sedimentology, mineralogy, geochemistry, and section correlation

Stratigraphy and Geological Correlation ◽

10.1134/s0869593812010030 ◽

2012 ◽

Vol 20 (1) ◽

pp. 15-41 ◽

Cited By ~ 11

Author(s):

P. B. Kabanov ◽

T. V. Alekseeva ◽

A. O. Alekseev

Keyword(s):

Type Area ◽

Serpukhovian Stage

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Late Moscovian fusulinids from the “N” Formation (Donets Basin, Ukraine)

Journal of Paleontology ◽

10.1666/11-132r1.1 ◽

2013 ◽

Vol 87 (1) ◽

pp. 44-68 ◽

Cited By ~ 4

Author(s):

Rimma R. Khodjanyazova ◽

Vladimir I. Davydov

Keyword(s):

New Species ◽

Sea Level ◽

Donets Basin ◽

Taxonomic Study ◽

Evolutionary Trend ◽

Type Area ◽

Distributional Patterns ◽

Moscow Basin ◽

Three New Species

A fusulinoidean taxonomic study of the Gurkovo and Kalinovo sections allows us to refine the biostratigraphy of the poorly studied Myachkovian (upper Moscovian) strata of the “N” Formation in the Donets Basin. Three fusulinid biozones,Hemifusulina graciosa–Fusiella spatiosa,Fusulina cylindrica–Fusulinella pseudobocki, andFusulinella?kumpani, are proposed in the interval from the top of Limestone M10to the base of N3, and they are correlated with coeval strata in the historical type area of the Moscow Basin. A total of 33 fusulinid species and subspecies belonging to eight genera are described, including three new species:Hemifusulina gurkovensisn. sp.,Beedeina innaeformisn. sp., andFusulina sosninaen. sp. The main evolutionary trend in fusulinoidean morphology in the late Moscovian is the appearance of massive secondary deposits in the limestone of the “N” Formation.Specific temporal and distributional patterns of the Middle Pennsylvanian fusulinoidean assemblages indicate variations in sea level stand. Variations are cyclic, with periods ∼600,000–1,000,000 years. AHemifusulina-association indicates the beginning of transgression; the late transgression–high sea level stand is designated by theBeedeina–Neostaffella–Ozawainella–Taitzehoellaassemblage which is successively replaced by the most diverseFusulinella-dominant association, which occupied a progressively shallowing sea.The similarity of fusulinoidean assemblages in the Moscow and Donets Basins and their cognate evolution trends reveal a connection between both regions at least during Podolskian–Myachkovian time.

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Integrated stratigraphy of the Kimmeridge Clay Formation (Upper Jurassic) based on exposures and boreholes in south Dorset, UK

Geological Magazine ◽

10.1017/s0016756801005738 ◽

2001 ◽

Vol 138 (5) ◽

pp. 511-539 ◽

Cited By ~ 69

Author(s):

HELEN S. MORGANS-BELL ◽

ANGELA L. COE ◽

STEPHEN P. HESSELBO ◽

HUGH C. JENKYNS ◽

GRAHAM P. WEEDON ◽

...

Keyword(s):

Magnetic Susceptibility ◽

Gamma Ray ◽

Analytical Data ◽

Upper Jurassic ◽

Data Sets ◽

Borehole Data ◽

Type Section ◽

Type Area ◽

Complete Section ◽

Clay Formation

For the purposes of a high-resolution multi-disciplinary study of the Upper Jurassic Kimmeridge Clay Formation, two boreholes were drilled at Swanworth Quarry and one at Metherhills, south Dorset, UK. Together, the cores represent the first complete section through the entire formation close to the type section. We present graphic logs that record the stratigraphy of the cores, and outline the complementary geophysical and analytical data sets (gamma ray, magnetic susceptibility, total organic carbon, carbonate, δ13Corg). Of particular note are the new borehole data from the lowermost part of the formation which does not crop out in the type area. Detailed logs are available for download from the Kimmeridge Drilling Project web-site at http://kimmeridge.earth.ox.ac.uk/. Of further interest is a mid-eudoxus Zone positive shift in the δ13Corg record, a feature that is also registered in Tethyan carbonate successions, suggesting that it is a regional event and may therefore be useful for correlation. The lithostratigraphy of the cores has been precisely correlated with the nearby cliff section, which has also been examined and re-described. Magnetic-susceptibility and spectral gamma-ray measurements were made at a regular spacing through the succession, and facilitate core-to-exposure correlation. The strata of the exposure and core have been subdivided into four main mudrock lithological types: (a) medium-dark–dark-grey marl; (b) medium-dark–dark grey–greenish black shale; (c) dark-grey–olive-black laminated shale; (d) greyish-black–brownish-black mudstone. The sections also contain subordinate amounts of siltstone, limestone and dolostone. Comparison of the type section with the cores reveals slight lithological variation and notable thickness differences between the coeval strata. The proximity of the boreholes and different parts of the type section to the Purbeck–Isle of Wight Disturbance is proposed as a likely control on the thickness changes.

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