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...
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ftedgehilluniv:oai:repository.edgehill.ac.uk:8379 2023-05-15T14:25:37+02:00 Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway Kirkland, Christopher L MacGabhann, Breandan Kirkland, Brian Daly, Stephen 2016-10-26 text http://repository.edgehill.ac.uk/8379/ http://repository.edgehill.ac.uk/8379/1/journal.pone.0164071.PDF http://journals.plos.org/plosone/article? id=10.1371/journal.pone.0164071 en eng http://repository.edgehill.ac.uk/8379/1/journal.pone.0164071.PDF Kirkland, Christopher L, MacGabhann, Breandan, Kirkland, Brian and Daly, Stephen (2016) Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway. PLOS ONE. ISSN 1932-6203 DOI https://doi.org/10.1371/journal.pone.0164071 <https://doi.org/10.1371/journal.pone.0164071> cc_by_4 CC-BY G Geography (General) Article PeerReviewed 2016 ftedgehilluniv https://doi.org/10.1371/journal.pone.0164071 2018-02-03T16:55:54Z 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 Arctic Edge Hill University: Edge Hill Research Archive Arctic Norway Holdfast ENVELOPE(-66.590,-66.590,-66.803,-66.803) PLOS ONE 11 10 e0164071 |
institution |
Open Polar |
collection |
Edge Hill University: Edge Hill Research Archive |
op_collection_id |
ftedgehilluniv |
language |
English |
topic |
G Geography (General) |
spellingShingle |
G Geography (General) Kirkland, Christopher L MacGabhann, Breandan Kirkland, Brian Daly, Stephen Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway |
topic_facet |
G Geography (General) |
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 |
Kirkland, Christopher L MacGabhann, Breandan Kirkland, Brian Daly, Stephen |
author_facet |
Kirkland, Christopher L MacGabhann, Breandan Kirkland, Brian Daly, Stephen |
author_sort |
Kirkland, Christopher L |
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 |
publishDate |
2016 |
url |
http://repository.edgehill.ac.uk/8379/ http://repository.edgehill.ac.uk/8379/1/journal.pone.0164071.PDF http://journals.plos.org/plosone/article? id=10.1371/journal.pone.0164071 |
long_lat |
ENVELOPE(-66.590,-66.590,-66.803,-66.803) |
geographic |
Arctic Norway Holdfast |
geographic_facet |
Arctic Norway Holdfast |
genre |
Arctic Arctic |
genre_facet |
Arctic Arctic |
op_relation |
http://repository.edgehill.ac.uk/8379/1/journal.pone.0164071.PDF Kirkland, Christopher L, MacGabhann, Breandan, Kirkland, Brian and Daly, Stephen (2016) Cryptic Disc Structures Resembling Ediacaran Discoidal Fossils from the Lower Silurian Hellefjord Schist, Arctic Norway. PLOS ONE. ISSN 1932-6203 DOI https://doi.org/10.1371/journal.pone.0164071 <https://doi.org/10.1371/journal.pone.0164071> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1371/journal.pone.0164071 |
container_title |
PLOS ONE |
container_volume |
11 |
container_issue |
10 |
container_start_page |
e0164071 |
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1766298061953302528 |