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Vertebrate Microfossils as Tools in Stratigraphy: A Study of the LowerDevonian Andrée Land Group Spitsbergen
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology, Evolution and Developmental Biology. (Evolution and Development)ORCID iD: 0000-0001-5209-5767
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Organismal Biology. (Evolution and Development)
University of Alabama.
Muséum national d'histoire naturelle.
2014 (English)In: Springer Geology, p. 1167-1171Article in journal (Refereed) Published
Abstract [en]

We have studied vertebrate microremains from the Lower to Middle Devonian of the Andrée Land Group, comprising the Wood Bay and Grey Hoek formations. We have defined two new thelodont assemblages, which represent different depositional phases during the late Early to early Middle Devonian formation of the Andrée Land Group. The definition of these two new thelodont assemblages allows us to precisely establish the relative ages of the Lower–Middle Devonian strata. Rare earth element (REE) abundances were measured in a number of thelodont and chondrichthyan microfossil dental tissue biominerals, using laser ablation inductively coupled plasma mass spectrometry (LA–ICP–MS). The evaluation of fossil preservation level was performed using semiquantitative spot-geochemistry analyses on finely polished thelodont scale thin-sections using Energy Dispersive X-ray Spectroscopy (EDS), and Electron Backscattering Diffractometry (EBSD) was applied to detect recrystallization. Stable oxygen isotope measurements (δ18O) of bulk biominerals were conducted in parallel, and showed lower heavy oxygen values in the fossil tissues with stronger visible alteration, such as those from the Grey Hoek Formation. Our results suggest that certain lithostratigraphic units of the Andrée Land Group must be regarded as contemporaneous lithofacies subjected to different sedimentary environments, rather than as separate stratigraphic members.

Place, publisher, year, edition, pages
2014. p. 1167-1171
National Category
Evolutionary Biology
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URN: urn:nbn:se:uu:diva-379915DOI: 10.1007/978-3-319-04364-7_224OAI: oai:DiVA.org:uu-379915DiVA, id: diva2:1298014
Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-09-05Bibliographically approved

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Zigaite, ZivileBlom, Henning

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