Late Ediacaran occurrences of the organic-walled microfossils Granomarginata and flask-shaped Lagoenaforma collaris gen. et sp. nov.
<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 (Ediacara...
Published in: | Geological Magazine |
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Main Authors: | , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
2021
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Subjects: | |
Online Access: | https://eprints.keele.ac.uk/id/eprint/10706/ https://eprints.keele.ac.uk/id/eprint/10706/1/Agi%C4%87_etal_2021_GeolMag_Late%20Ediacaran%20occurrences%20of%20the%20organic-walled%20microfossils%20Granomarginata%20and%20flask-shaped%20Lagoenaforma%20collaris%20gen.%20et%20sp.%20nov.pdf https://www.cambridge.org/core/journals/geological-magazine/article/late-ediacaran-occurrences-of-the-organicwalled-microfossils-granomarginata-and-flaskshaped-lagoenaforma-collaris-gen-et-sp-nov/EF9C93B4241E94E939570AC2A49026B8 https://doi.org/10.1017/s0016756821001096 |
Summary: | <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 (< 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 ... |
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