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An Early to Middle Ordovician succession of conodont faunas at Mäekalda, northern Estonia

Published online by Cambridge University Press:  31 January 2002

VIIVE VIIRA
Affiliation:
Institute of Geology at Tallinn Technical University, Estonia Avenue 7, EE-10143 Tallinn, Estonia
ANITA LÖFGREN
Affiliation:
Department of Geology, Lund University, Sölvegatan 13, SE-223 62 Lund, Sweden
SILVI MÄGI
Affiliation:
Institute of Geology at Tallinn Technical University, Estonia Avenue 7, EE-10143 Tallinn, Estonia
JENNY WICKSTRÖM
Affiliation:
Department of Geology, Lund University, Sölvegatan 13, SE-223 62 Lund, Sweden

Abstract

The Mäekalda section presents a c. 12 m thick succession of mainly limestones, dolomites and siltstones of late Tremadoc to late Llanvirn age, exposed on the eastern outskirts of Tallinn, northern Estonia. The condensed sequence is rich in well-preserved conodont elements that provide the basis for detailed biozonation. In the Baltoscandian zonation, beds from the upper Varangu Paltodus deltifer Zone up to the lower Aseri Eoplacognathus foliaceus Subzone have been identified. In all, the conodont faunas exhibit a close resemblance to Swedish faunas. Many intervals can also be compared with coeval strata in western Russia. The presence at some levels of representatives of Laurentian conodont lineages provides an unusual opportunity for correlating Baltoscandian sequences with sequences in North America, especially in the lower Arenig part of the succession. The middle Volkhov (upper middle Arenig) Paroistodus originalis Zone at Mäekalda is remarkably complete bearing in mind the highly condensed nature of the section as a whole. The details of this zone can be correlated with the equivalent intervals in Swedish sections. In the upper Volkhov–lower Kunda beds there is a considerable stratigraphic gap in the section, but the upper Kunda has provided an excellent series of successive populations of Eoplacognathus, indicating that in this part the section is virtually complete.

Type
Research Article
Copyright
© 2001 Cambridge University Press

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