Agić, H, Högström, AES, Jensen, S, Ebbestad, JOR, Vickers-Rich, P, Hall, M, Matthews, JJ, Meinhold, G ORCID: https://orcid.org/0000-0001-8375-8375, Høyberget, M and Taylor, WL (2021) Late Ediacaran occurrences of the organic-walled microfossils Granomarginata and flask-shaped Lagoenaforma collaris gen. et sp. nov. Geological Magazine. 1 - 22.

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Abstract

<jats:title>Abstract</jats:title> <jats:p>New occurrences of flask-shaped and envelope-bearing microfossils, including the predominantly Cambrian taxon <jats:italic>Granomarginata</jats:italic>, are reported from new localities, as well as from earlier in time (Ediacaran) than previously known. The stratigraphic range of <jats:italic>Granomarginata</jats:italic> extends into the Cambrian System, where it had a cosmopolitan distribution. This newly reported Ediacaran record includes areas from Norway (Baltica), Newfoundland (Avalonia) and Namibia (adjacent to the Kalahari Craton), and puts the oldest global occurrence of <jats:italic>Granomarginata</jats:italic> in the Indreelva Member (&lt; 563 Ma) of the Stáhpogieddi Formation on the Digermulen Peninsula, Arctic Norway. Although <jats:italic>Granomarginata</jats:italic> is rare within the assemblage, these new occurrences together with previously reported occurrences from India and Poland, suggest a potentially widespread palaeogeographic distribution of <jats:italic>Granomarginata</jats:italic> through the middle–late Ediacaran interval. A new flask-shaped microfossil <jats:italic>Lagoenaforma collaris</jats:italic> gen. et sp. nov. is also reported in horizons containing <jats:italic>Granomarginata</jats:italic> from the Stáhpogieddi Formation in Norway and the Dabis Formation in Namibia, and flask-shaped fossils are also found in the Gibbett Hill Formation in Newfoundland. The <jats:italic>Granomarginata</jats:italic>–<jats:italic>Lagoenaforma</jats:italic> association, in addition to a low-diversity organic-walled microfossil assemblage, occurs in the strata postdating the Shuram carbon isotope excursion, and may eventually be of use in terminal Ediacaran biostratigraphy. These older occurrences of <jats:italic>Granomarginata</jats:italic> add to a growing record of body fossil taxa spanning the Ediacaran–Cambrian boundary.</jats:p>

Item Type: Article
Additional Information: © The Author(s), 2021. Published by Cambridge University Press. This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http:// creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction, provided the original article is properly cited.
Subjects: G Geography. Anthropology. Recreation > G Geography (General)
Q Science > Q Science (General)
Q Science > QE Geology
Divisions: Faculty of Natural Sciences > School of Geography, Geology and the Environment
Depositing User: Symplectic
Date Deposited: 15 Mar 2022 16:35
Last Modified: 15 Mar 2022 16:35
URI: https://eprints.keele.ac.uk/id/eprint/10706

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