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    Cryptic disc structures resembling Ediacaran discoidal fossils from the lower Silurian Hellefjord Schist, Arctic Norway

    Citation

    Kirkland CL, MacGabhann BA, Kirkland BL, Daly JS (2016) Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway. PLoS ONE 11(10): e0164071. doi:10.1371/journal.pone.0164071
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    Date
    2016
    Author
    MacGabhann, Breandán Anraoi
    Kirkland, Christopher L.
    Kirkland, Brian L.
    Daly, Stephen
    Peer Reviewed
    Yes
    Metadata
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    Kirkland CL, MacGabhann BA, Kirkland BL, Daly JS (2016) Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway. PLoS ONE 11(10): e0164071. doi:10.1371/journal.pone.0164071
    Abstract
    The Hellefjord Schist, a volcaniclastic psammite-pelite formation in the Caledonides of Arctic Norway contains discoidal impressions and apparent tube casts that share morphological and taphonomic similarities to Neoproterozoic stem-holdfast forms. U-Pb zircon geochronology on the host metasediment indicates it was deposited between 437 ± 2 and 439 ± 3 Ma, but also indicates that an inferred basal conglomerate to this formation must be part of an older stratigraphic element, as it is cross-cut by a 546 ± 4 Ma pegmatite. These results confirm that the Hellefjord Schist is separated from underlying older Proterozoic rocks by a thrust. It has previously been argued that the Cambrian Substrate Revolution destroyed the ecological niches that the Neoproterozoic frond-holdfasts organisms occupied. However, the discovery of these fossils in Silurian rocks demonstrates that the environment and substrate must have been similar enough to Neoproterozoic settings that frond-holdfast bodyplans were still ecologically viable some hundred million years later.
    Keywords
    Cryptic
    Disc
    Structures
    Resemblance
    Ediacaran
    Discoidal
    Fossils
    Lower Silurian Hellefjord Schist
    Arctic Norway
    Language (ISO 639-3)
    eng
    Publisher
    Public Library of Science
    License URI
    https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0164071
    DOI
    10.1371/journal.pone.0164071
    URI
    http://hdl.handle.net/10395/2406
    Collections
    • Geography (Peer-reviewed publications)

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