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Re-evaluation of the stratigraphically important olenellid trilobite Holmia cf. mobergi from the Cambrian Series 2, Stage 3 and its implications for the lower Cambrian stratigraphy in the Mjøsa area, Norway
Rennesveien 14, N-4513 Mandal, Norway.
Uppsala University, Music and Museums, Museum of Evolution. Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Palaeobiology.ORCID iD: 0000-0001-8769-3572
Gjelleråsveien 10, N–1481 Hagan, Norway.
2019 (English)In: Norwegian Journal of Geology, Vol. 99, no 1, p. 1-30Article in journal (Refereed) Published
Abstract [en]

The olenellid trilobite Holmia cf. mobergi, known from a single cephalon in the upper lower Cambrian strata from a river section in Flagstadelva, Hamar, has played a significant stratigraphic role in interpreting the lower Cambrian informal Series 2, Stage 3 in the Mjøsa area, Norway, sinceits discovery in the early 1950s. It was considered one of the oldest trilobite taxa in the lower Cambrian of Scandinavia, but the stratigraphic leveland biozonation of the cephalon were problematic and a matter of discussion for decades. Moreover, organic-walled microfossil biostratigraphyquestioned the supposed age of the trilobite. New specimens of this taxon collected from the type locality show that the species occurs at a differentstratigraphic level than first reported, prompting a new description of the species and a re-evaluation of the taxon’s biostratigraphic significance.Holmia cf. mobergi is compared with new and well-preserved topotype material of Holmia inusitata, a very rare taxon hitherto known from onesingle outcrop in an autochthonous setting in Norway. Holmia cf. mobergi and Holmia inusitata are here considered conspecific.

Place, publisher, year, edition, pages
2019. Vol. 99, no 1, p. 1-30
Keywords [en]
Cambrian Series 2, biostratigraphy, Holmia, ontogeny, Mjøsa area, Norway
National Category
Other Earth and Related Environmental Sciences
Research subject
Earth Science with specialization in Historical Geology and Palaeontology
Identifiers
URN: urn:nbn:se:uu:diva-398899DOI: 10.17850/njg99-1-04OAI: oai:DiVA.org:uu-398899DiVA, id: diva2:1377241
Available from: 2019-12-11 Created: 2019-12-11 Last updated: 2019-12-18Bibliographically approved

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