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First record of Telephina (Trilobita) from the Ordovician of northeastern Estonia and its stratigraphical implications

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Author(s): Helje Pärnaste | Adrian Popp

Journal: Estonian Journal of Earth Sciences
ISSN 1736-4728

Volume: 60;
Issue: 2;
Start page: 83;
Date: 2011;
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Keywords: Ordovician | Baltoscandia | Viivikonna Formation | Kukruse Stage | trilobites | Telephina.

ABSTRACT
For the first time a telephinid trilobite was recorded from the shallow-water rocks of the North Estonian Confacies Belt in the oil-shale mining area of northeast Estonia. A cranidium of Telephina (Telephops) biseriata (Asklund) was collected from a loose boulder of the kerogenous limestone of the Viivikonna Formation, Kukruse Stage, together with a rich assemblage of other trilobites, bryozoans, ostracods and rare graptolites. In its type area Jämtland, Sweden, T. biseriata occurs together with Pygodus anserinus and Hustedograptus teretiusculus in the Ståltorp Limestone Member of the Andersö Shale Formation, marking the latest Darriwilian. The occurrence in the North Estonian Confacies Belt of Telephina, known as a pelagic trilobite inhabiting deeper-water areas, probably reflects a transgression event at this time. Together with T. biseriata, other trilobite taxa such as Remopleurides and Lonchodomas, common in the Hustedograptus teretiusculus Biozone in deeper-water areas, arrive in the North Estonian Confacies Belt. Graptolites from the other loose boulders at the same locality have been identified as Hustedograptus cf. uplandicus, which occur together with a few dendroids.
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