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Geological Magazine; November 2007; v. 144; no. 6; p. 953-961; DOI: 10.1017/S0016756807003597
© 2007 Cambridge University Press (CUP)
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A new lower Cambrian eodiscoid trilobite fauna from Swedish Lapland and its implications for intercontinental correlation

NIKLAS AXHEIMER*,{ddagger}, PER AHLBERG* and PETER CEDERSTRÖM{dagger}

* Department of Geology, GeoBiosphere Science Centre, Lund University, Sölvegatan 12, SE-223 62 Lund, Sweden
{dagger} Axelvoldsvägen 27, SE-241 35 Eslöv, Sweden

{ddagger} Author for correspondence: Niklas.Axheimer{at}geol.lu.se

A lower Cambrian eodiscoid trilobite fauna and an associated holmiid trilobite, Holmia sp., are described from a bioclastic limestone at the top of the Torneträsk Formation in the Luobákti section, south of Lake Torneträsk, northern Sweden. Other associated polymerid trilobites include Orodes? lapponica and Strenuaeva inflata. The precise age of the trilobite fauna cannot be determined, but its generic composition and stratigraphical position at the top of the lower Cambrian suggest that it was recovered from the Ornamentaspis? linnarssoni Assemblage Zone. Two species of eodiscoids are present: Neocobboldia aff. dentata and Chelediscus acifer. The latter species is known previously from England and southeastern Newfoundland, and provides a novel link between upper lower Cambrian successions in Baltica and Avalonia.

Key Words: eodiscoids • trilobites • correlation • biostratigraphy • lower Cambrian • Sweden






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