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Phosphatised olenid trilobites and associated fauna from the Upper Cambrian of Vastergotland, Sweden

Ahlberg, Per LU ; Szaniawski, H; Clarkson, ENK and Bengtson, S (2005) In Acta Palaeontologica Polonica 50(3). p.429-440
Abstract
Secondarily phosphatised olenid trilobites from organic-rich limestones (orsten) in the Furongian (Upper Cambrian) of Vastergotland, south-central Sweden, are described and illustrated. All trilobites originate from the Peltura scarabaeoides Zone and were collected on the western slope of Kinnekulle. Only the dorsal exoskeletons have become secondarily phosphatised, and the ventral appendages are not preserved. Yet the material is otherwise remarkably well preserved and reveals the morphology of the olenid trilobites in greater detail than hitherto known. Species belonging to the genera Ctenopyge, Sphaerophthalmus, Parabolina, and Peltura are identified, and several juvenile specimens are present in the material. The material is... (More)
Secondarily phosphatised olenid trilobites from organic-rich limestones (orsten) in the Furongian (Upper Cambrian) of Vastergotland, south-central Sweden, are described and illustrated. All trilobites originate from the Peltura scarabaeoides Zone and were collected on the western slope of Kinnekulle. Only the dorsal exoskeletons have become secondarily phosphatised, and the ventral appendages are not preserved. Yet the material is otherwise remarkably well preserved and reveals the morphology of the olenid trilobites in greater detail than hitherto known. Species belonging to the genera Ctenopyge, Sphaerophthalmus, Parabolina, and Peltura are identified, and several juvenile specimens are present in the material. The material is disarticulated and fragmentary, and it has only been possible to identify a few specimens to species level. In addition to chaetognaths and conodonts, the trilobites are associated with pelmatozoan columnals, a possible camaroid, and fossils of uncertain affinities. These fossils, along with a probable conulariid fragment from the Peltura minor Zone, are also described and discussed. The presence of a benthic fauna of pelmatozoans, and possible conulariids and camaroids, indicates that at least parts of the Peltura zones were deposited during dysoxic rather than anoxic periods. Moreover, the sea floor must have been firm enough to allow colonisation by sessile organisms. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
trilobita, olenidae, problematica, phosphatisation, Cambrian, Shales, Alum, Sweden, Vastergotland
in
Acta Palaeontologica Polonica
volume
50
issue
3
pages
429 - 440
publisher
Instytut Paleobiologii PAN
external identifiers
  • wos:000232242100002
  • scopus:26244433881
ISSN
0567-7920
language
English
LU publication?
yes
id
885fa492-ceca-44ab-bdfb-917021010592 (old id 222407)
alternative location
http://app.pan.pl/acta50/app50-429.pdf
date added to LUP
2007-08-21 11:15:56
date last changed
2017-01-01 07:11:25
@article{885fa492-ceca-44ab-bdfb-917021010592,
  abstract     = {Secondarily phosphatised olenid trilobites from organic-rich limestones (orsten) in the Furongian (Upper Cambrian) of Vastergotland, south-central Sweden, are described and illustrated. All trilobites originate from the Peltura scarabaeoides Zone and were collected on the western slope of Kinnekulle. Only the dorsal exoskeletons have become secondarily phosphatised, and the ventral appendages are not preserved. Yet the material is otherwise remarkably well preserved and reveals the morphology of the olenid trilobites in greater detail than hitherto known. Species belonging to the genera Ctenopyge, Sphaerophthalmus, Parabolina, and Peltura are identified, and several juvenile specimens are present in the material. The material is disarticulated and fragmentary, and it has only been possible to identify a few specimens to species level. In addition to chaetognaths and conodonts, the trilobites are associated with pelmatozoan columnals, a possible camaroid, and fossils of uncertain affinities. These fossils, along with a probable conulariid fragment from the Peltura minor Zone, are also described and discussed. The presence of a benthic fauna of pelmatozoans, and possible conulariids and camaroids, indicates that at least parts of the Peltura zones were deposited during dysoxic rather than anoxic periods. Moreover, the sea floor must have been firm enough to allow colonisation by sessile organisms.},
  author       = {Ahlberg, Per and Szaniawski, H and Clarkson, ENK and Bengtson, S},
  issn         = {0567-7920},
  keyword      = {trilobita,olenidae,problematica,phosphatisation,Cambrian,Shales,Alum,Sweden,Vastergotland},
  language     = {eng},
  number       = {3},
  pages        = {429--440},
  publisher    = {Instytut Paleobiologii PAN},
  series       = {Acta Palaeontologica Polonica},
  title        = {Phosphatised olenid trilobites and associated fauna from the Upper Cambrian of Vastergotland, Sweden},
  volume       = {50},
  year         = {2005},
}