Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway.
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...
Published in: | PLOS ONE |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Public Library of Science (PLoS)
2016
|
Subjects: | |
Online Access: | https://doi.org/10.1371/journal.pone.0164071 https://doaj.org/article/1b1b7bb903dd4c36b09ed766618a8ee7 |
id |
ftdoajarticles:oai:doaj.org/article:1b1b7bb903dd4c36b09ed766618a8ee7 |
---|---|
record_format |
openpolar |
spelling |
ftdoajarticles:oai:doaj.org/article:1b1b7bb903dd4c36b09ed766618a8ee7 2023-05-15T14:55:16+02:00 Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway. Christopher L Kirkland Breandán A MacGabhann Brian L Kirkland J Stephen Daly 2016-01-01T00:00:00Z https://doi.org/10.1371/journal.pone.0164071 https://doaj.org/article/1b1b7bb903dd4c36b09ed766618a8ee7 EN eng Public Library of Science (PLoS) http://europepmc.org/articles/PMC5082646?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0164071 https://doaj.org/article/1b1b7bb903dd4c36b09ed766618a8ee7 PLoS ONE, Vol 11, Iss 10, p e0164071 (2016) Medicine R Science Q article 2016 ftdoajarticles https://doi.org/10.1371/journal.pone.0164071 2022-12-31T16:23:04Z 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. Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Norway Holdfast ENVELOPE(-66.590,-66.590,-66.803,-66.803) PLOS ONE 11 10 e0164071 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Medicine R Science Q |
spellingShingle |
Medicine R Science Q Christopher L Kirkland Breandán A MacGabhann Brian L Kirkland J Stephen Daly Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway. |
topic_facet |
Medicine R Science Q |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Christopher L Kirkland Breandán A MacGabhann Brian L Kirkland J Stephen Daly |
author_facet |
Christopher L Kirkland Breandán A MacGabhann Brian L Kirkland J Stephen Daly |
author_sort |
Christopher L Kirkland |
title |
Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway. |
title_short |
Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway. |
title_full |
Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway. |
title_fullStr |
Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway. |
title_full_unstemmed |
Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway. |
title_sort |
cryptic disc structures resembling ediacaran discoidal fossils from the lower silurian hellefjord schist, arctic norway. |
publisher |
Public Library of Science (PLoS) |
publishDate |
2016 |
url |
https://doi.org/10.1371/journal.pone.0164071 https://doaj.org/article/1b1b7bb903dd4c36b09ed766618a8ee7 |
long_lat |
ENVELOPE(-66.590,-66.590,-66.803,-66.803) |
geographic |
Arctic Norway Holdfast |
geographic_facet |
Arctic Norway Holdfast |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
PLoS ONE, Vol 11, Iss 10, p e0164071 (2016) |
op_relation |
http://europepmc.org/articles/PMC5082646?pdf=render https://doaj.org/toc/1932-6203 1932-6203 doi:10.1371/journal.pone.0164071 https://doaj.org/article/1b1b7bb903dd4c36b09ed766618a8ee7 |
op_doi |
https://doi.org/10.1371/journal.pone.0164071 |
container_title |
PLOS ONE |
container_volume |
11 |
container_issue |
10 |
container_start_page |
e0164071 |
_version_ |
1766327052399542272 |