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Paläontologische Zeitschrift

, 74:543 | Cite as

The Hunneberg Stage (Ordovician) in the area east of St. Petersburg, north-western Russia

  • Tatiana Ju. Tolmacheva
  • Tatiana N. Koren
  • Lars E. Holmer
  • Leonid E. Popov
  • Elena Raevskaya
Article

Abstract

The bio- and lithostratigraphy of the poorly known early Ordovician (Arenig) Hunneberg Stage is described from the area east of St. Petersburg (Putilovo Quarry and Lava river), where the Lakity Beds (Leetse Fm.) consist of glauconitic sands and silty clays. The described fauna includes graptolites, conodonts, brachiopods, acritarchs, foraminifers, and several problematic groups. The Lakity Beds are unique within the lower Ordovician sequence of the East Baltic in the abundance of graptolites, co-occurring with conodonts. The conodonts from the lower part of the Lakity Beds belong to the uppermost subzone (Oelandodus elongatus — Acodus deltatus deltatus) of theParoistodus proteus Zone, coinciding with the lower part of theTetragraptus phyllograptoides Zone. This suggests that there is a hiatus between the Lakity Beds and the underlying Nazya Formation. The lower Lakity Beds also contain the brachiopodsLeptembolon lingulaeformis andEosiphonotreta cf.acrotretomorpha, which suggest that they may be correlated with the Joa Member of the Leetse Formation in North Estonia. In the upper part of the Lakity Beds, conodonts of thePrioniodus elegans Zone co-occur with graptolites indicating the upper subzone of theTetragraptus phyllograptoides Zone in the Scandinavian sections. There are still problems of defining and correlating the base of the Billingen Regional Stage, which are outside the scope of this paper.

Keywords

Ordovician Ventral Valve Conodont Element Glauconitic Sand Lava River 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Zusammenfassung

Die Bio- und Lithostratigraphie der wenig bekannten früh-ordovizischen Hunneberg-Stufe (Arenig) wird aus dem Gebiet östlich von St. Petersburg (Steinbruch Putilo und Lava Fluß) beschrieben, wo die Lakity-Schichten (Leetse-Formation) aus glaukonitischen Sanden und siltigen Tonen bestehen. Die hier beschriebene Fauna umfaßt Graptolithen, Conodonten, Brachiopoden Acritarchen, Foraminiferen und verschiedene problematische Gruppen. Die Lakity-Schichten sind innerhalb der unterordovizischen Abfolge des östlichen Baltikums einzigartig im Hinblick auf die Fülle an Graptolithen, die zusammen mit Conodonten auftreten. Die Conodonten des unteren Teils der Lakity-Schichten gehören zur obersten Subzone (Oelandodus elongatus — Acodus deltatus deltatus) derParoistodus proteus Zone, die dem unteren Teil derTetragraptus phyllograptoides Zone entspricht. Dieser Umstand deutet darauf hin, daß ein Hiatus zwischen den Lakity-Schichten und der darunter liegenden Nazya-Formation vorhanden ist. Die unteren Lakity-Schichten enthalten auch die BrachiopodenLeptembolon lingulaeformis undEosiphonotreta cf.acrotretomorpha, was darauf hindeutet, daß sie mit dem Joa-Member der Leetse-Formation in Nord-Estland korreliert werden können. Im oberen Teil der Lakity-Schichten treten Conodonten derPrioniodus elegans Zone zusammen mit Graptolithen auf und weisen auf die obere Subzone derTetragraptus phyllograptoides Zone in den skandinavischen Profilen hin. Probleme bestehen noch hinsichtlich der Definition und Korrelation der Basis der Billingen-Stufe, was jedoch außerhalb der Themenstellung dieser Arbeit liegt.

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Copyright information

© E. Schweizerbart’sche Verlagsbuchhandlung 2001

Authors and Affiliations

  • Tatiana Ju. Tolmacheva
    • 1
  • Tatiana N. Koren
    • 2
  • Lars E. Holmer
    • 1
  • Leonid E. Popov
    • 2
  • Elena Raevskaya
    • 3
  1. 1.Department of Historical Geology and Palaeontology, Institute of Earth SciencesUniversity of UppsalaUppsalaSweden
  2. 2.All-Russian Geological Research Institute (VSEGEI)St. PetersburgRussia
  3. 3.All-Russian Petroleum Exploration Institute (VNIGRI)St. PetersburgRussia

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