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The fossil alga Chaetocladus gracilis revisited : new material from the Silurian of Sweden

Pettersson, Johan LU ; Ahlberg, Per LU ; Lindskog, Anders LU ; Lindgren, Johan LU and Eriksson, Mats E. LU (2020) In GFF 142(4). p.304-308
Abstract

In 2006, a new species of non-calcified dasycladalean alga, Chaetocladus gracilis, from the upper Silurian of Skåne (Scania), southernmost Sweden, was erected. The original description was based on a single incomplete fossil recovered from the abandoned limestone quarry at Bjärsjölagård, a classic geologic locality in Scania. Here we present four additional and, importantly, more complete specimens from this same site and type stratum. This new material largely corroborates the general anatomical features of C. gracilis, but also adds some intricate details, most notably with regards to the external sheet-like phytoleim and organisation of the laterals. Elemental mapping confirmed an expected carbonaceous composition of the fossils,... (More)

In 2006, a new species of non-calcified dasycladalean alga, Chaetocladus gracilis, from the upper Silurian of Skåne (Scania), southernmost Sweden, was erected. The original description was based on a single incomplete fossil recovered from the abandoned limestone quarry at Bjärsjölagård, a classic geologic locality in Scania. Here we present four additional and, importantly, more complete specimens from this same site and type stratum. This new material largely corroborates the general anatomical features of C. gracilis, but also adds some intricate details, most notably with regards to the external sheet-like phytoleim and organisation of the laterals. Elemental mapping confirmed an expected carbonaceous composition of the fossils, which are embedded in a calcareous mudstone. These additional fossils show that the originally described specimen was not a singular occurrence at this locality. Based on the state of preservation of our algal fossils, we note that the mudstone facies of the Ludlow Bjärsjölagård Limestone Member of the Klinta Formation (Öved-Ramsåsa Group), from which all C. gracilis have been recovered, share characteristics with deposits typically referred to as “algal-Lagerstätten”.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
algal-Lagerstätte, Bjärsjölagård Limestone, Dasycladalean algae, Klinta Formation, Lau Event
in
GFF
volume
142
issue
4
pages
5 pages
publisher
Taylor & Francis
external identifiers
  • scopus:85091306684
ISSN
1103-5897
DOI
10.1080/11035897.2020.1819408
language
English
LU publication?
yes
id
472bfb42-2488-4acc-8361-ced9681af3a7
date added to LUP
2020-10-28 13:38:44
date last changed
2021-01-06 05:12:33
@article{472bfb42-2488-4acc-8361-ced9681af3a7,
  abstract     = {<p>In 2006, a new species of non-calcified dasycladalean alga, Chaetocladus gracilis, from the upper Silurian of Skåne (Scania), southernmost Sweden, was erected. The original description was based on a single incomplete fossil recovered from the abandoned limestone quarry at Bjärsjölagård, a classic geologic locality in Scania. Here we present four additional and, importantly, more complete specimens from this same site and type stratum. This new material largely corroborates the general anatomical features of C. gracilis, but also adds some intricate details, most notably with regards to the external sheet-like phytoleim and organisation of the laterals. Elemental mapping confirmed an expected carbonaceous composition of the fossils, which are embedded in a calcareous mudstone. These additional fossils show that the originally described specimen was not a singular occurrence at this locality. Based on the state of preservation of our algal fossils, we note that the mudstone facies of the Ludlow Bjärsjölagård Limestone Member of the Klinta Formation (Öved-Ramsåsa Group), from which all C. gracilis have been recovered, share characteristics with deposits typically referred to as “algal-Lagerstätten”.</p>},
  author       = {Pettersson, Johan and Ahlberg, Per and Lindskog, Anders and Lindgren, Johan and Eriksson, Mats E.},
  issn         = {1103-5897},
  language     = {eng},
  number       = {4},
  pages        = {304--308},
  publisher    = {Taylor & Francis},
  series       = {GFF},
  title        = {The fossil alga Chaetocladus gracilis revisited : new material from the Silurian of Sweden},
  url          = {http://dx.doi.org/10.1080/11035897.2020.1819408},
  doi          = {10.1080/11035897.2020.1819408},
  volume       = {142},
  year         = {2020},
}