Volkhov graptolites from the lower-middle Ordovician boundary beds of the St. Petersburg region, Russia

Koren, Tatiana N.; Gorshenina, V.V.; Tolmacheva, T. Yu.

doi:10.1007/bf03009139

Cited by 5 publications

(5 citation statements)

References 17 publications

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“…Numerous graptolites were collected from several layers within the mud-mound clay beds of the Volkhov Fm., in association with the benthic fauna and conodonts. The graptolite diversity is relatively low and the assemblage includes no more then seven species in all localities: Expansograptus hirundo Salter, E. goldschmidti (Monsen), Xiphograptus svalbardensis (Archer & Fortey), Tetragraptus amii Elles & Wood, T. quadribrachiatus (Hall), T. reclinatus Elles & Wood, and Azygograptus volchovensis Koren (Koren et al 2004).…”

Section: Middle Ordovicianmentioning

confidence: 98%

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Advances in the Ordovician graptolite biostratigraphy of the St Petersburg area, Russia

Suyarkova¹,

Koren²

2009

Estonian J. Earth Sci.

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The Ordovician shallow-water shelf deposits rich in benthic fauna are exposed along the Russian part of the Baltic-Ladoga Klint. Graptolites occur only at some stratigraphic levels, being comparatively numerous in marls and clays and very rare in carbonate layers. Since the 19th century graptolites have been collected from exposures of the Pakerort, Hunneberg, Billingen, and Volkhov regional stages (Tremadocian-Dapingian), while in the Uhaku-Idavere stratigraphic interval (Darriwilian-lower Sandbian) rare graptolites have been found in boreholes. Up to now, only some collections have been systematically studied. On the basis of new graptolite finds, recently the Pterograptus elegans Biozone was established in the upper Aseri Stage and the Nemagraptus gracilis Biozone in the lower Kukruse Stage. Detailed sampling of the Shundorovo Formation (upper Idavere Stage) resulted in the discovery of numerous diplograptids at five stratigraphic levels, in association with various dendroids. These diplograptids were provisionally assigned to ?Archiclimacograptus antiquus lineatus Elles & Wood. A systematic description of the late Darriwilian and early Sandbian diplograptids is under preparation.

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Section: Middle Ordovicianmentioning

confidence: 98%

“…Presently, this stratigraphic interval is covered by comparatively complete graptolite data. Based on the systematic descriptions and biostratigraphic analysis, the Tetragraptus phyllograptoides and Expansograptus hirundo biozones of Baltoscandia were established Koren et al 2004) (Fig. 2).…”

Section: Introductionmentioning

confidence: 99%

Advances in the Ordovician graptolite biostratigraphy of the St Petersburg area, Russia

Suyarkova¹,

Koren²

2009

Estonian J. Earth Sci.

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“…The Ventspils and Pavilosta boreholes (Figs 4,5) are located in the depression facies of the Baltic Basin (Nestor & Einasto 1982), characterized mostly by argillaceous marlstones with graptolites. The Gussev-1 (or Gusevskaya-1 by Koren et al 2005) core (Fig. 6) in the southernmost edge of the basin contains dolomitic mudstones.…”

Section: Lithology Facies and Stratigraphical Notesmentioning

confidence: 99%

“…3) also refer to the correspondence of the S. lycoperdoides and nassaludensis zones. Concerning the position of the boundary between the colonus and scanicus zones, some graptolite data from the Gussev-1 core (Koren et al 2005) seem to be insufficiently detailed and there was no evidence presented to place the bottom of the scanicus Zone at a depth of 1464 m (Fig. 6).…”

Section: The Sphaerochitina Lycoperdoides Biozonementioning

confidence: 99%

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Chitinozoans in the Wenlock–Ludlow boundary beds of the East Baltic

Nestor¹

2007

EJES

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The distribution of chitinozoans in the Wenlock-Ludlow boundary beds was studied in five drill core sections of the East Baltic. It was established that most of the typical Wenlock chitinozoan species became extinct in the uppermost part of the Jaagarahu Stage. In the lower part of the Rootsiküla Stage the Sphaerochitina lycoperdoides Biozone was identified for the first time. The Conochitina postarmillata and Ancyrochitina desmea biozones were established in the Dubysa Formation of the Paadla Stage in the Ventspils and Pavilosta cores and in the Gorstian Stage of the Gussev-1 core. Two stratigraphically important new species, Rhabdochitina sera and Conochitina postarmillata, were described, and Eisenackitina lagena (Eisenack) was redescribed.

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Carbon and oxygen isotope compositions of Lower-Middle Ordovician carbonate rocks in the northwestern Russian platform

Pokrovsky

2014

Lithol Miner Resour

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Volkhov graptolites from the lower-middle Ordovician boundary beds of the St. Petersburg region, Russia

Cited by 5 publications

References 17 publications

Advances in the Ordovician graptolite biostratigraphy of the St Petersburg area, Russia

Advances in the Ordovician graptolite biostratigraphy of the St Petersburg area, Russia

Chitinozoans in the Wenlock–Ludlow boundary beds of the East Baltic

Carbon and oxygen isotope compositions of Lower-Middle Ordovician carbonate rocks in the northwestern Russian platform

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