A new lower Cambrian eodiscoid trilobite fauna from Swedish Lapland and its implications for intercontinental correlation

A lower Cambrian eodiscoid trilobite fauna and an associated holmiid trilobite, Holmia
sp., are described from a bioclastic limestone at the top of the Tornetr¨ask Formation in the Luob´akti
section, south of Lake Tornetr¨ask, 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.