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Biotic dynamics and carbonate microfacies of the conspicuous Darriwilian (Middle Ordovician) 'Taljsten' interval, south-central Sweden

Eriksson, Mats LU ; Lindskog, Anders LU ; Calner, Mikael LU ; Mellgren, Johanna LU ; Bergstrom, Stig M.; Terfelt, Fredrik LU and Schmitz, Birger LU (2012) In Palaeogeography, Palaeoclimatology, Palaeoecology 367. p.89-103
Abstract
Enclosed in the Darriwilian (Middle Ordovician) part of the reddish 'orthoceratite limestone' of Baltoscandia is a conspicuous c. 1.5 m thick unit colloquially known as the 'Taljsten' interval. It has a wide geographical distribution in the Baltoscandian paleocontinent but is particularly well exposed in south-central Sweden. The unit is characterized by its deviant gray color and beds with a mass occurrence of cystoid echinoderms. Moreover, the recent discovery of an anomalous abundance of extraterrestrial chromite grains and micrometeorites in the 'Taljsten' and immediately adjacent strata bear witness of a time of deposition correlating to an increased influx of extraterrestrial matter to Earth. In this study we analyze the faunal... (More)
Enclosed in the Darriwilian (Middle Ordovician) part of the reddish 'orthoceratite limestone' of Baltoscandia is a conspicuous c. 1.5 m thick unit colloquially known as the 'Taljsten' interval. It has a wide geographical distribution in the Baltoscandian paleocontinent but is particularly well exposed in south-central Sweden. The unit is characterized by its deviant gray color and beds with a mass occurrence of cystoid echinoderms. Moreover, the recent discovery of an anomalous abundance of extraterrestrial chromite grains and micrometeorites in the 'Taljsten' and immediately adjacent strata bear witness of a time of deposition correlating to an increased influx of extraterrestrial matter to Earth. In this study we analyze the faunal dynamics, based primarily on microfossils and carbonate microfacies, across this intriguing interval. Generally known as a macrolithologically monotonous succession, the 'Taljsten' proved more heterogeneous than previously believed in terms of fossil content and preservation, as well as mineral content and composition. The general texture is wackestone/packstone, but local heterogeneities are frequent. A microfaunal reorganization occurred with a transition from a trilobite- and brachiopod-dominated community to one dominated by echinoderms, which is mirrored also macroscopically by the cystoids. The latter pelmatozoans seem to have flourished and might even have aided in the formation of the numerous hardgrounds. The increase in echinoderms is linked to a Volkhovian increase in echinoderms in eastern Baltica. In the immediate post-'Taljsten' strata there is no distinct change back to the pre-'Taljsten' biota. Conodont and ostracod faunal diversity data reveal peak values in the 'Taljsten' compared to the enclosing strata, suggesting that the paleoenvironment was more suitable for higher diversity faunas of these metazoan groups. All data collectively support a regression in the beginning of the 'Taljsten', likely followed by transgression in its upper part. (C) 2012 Elsevier B.V. All rights reserved. (Less)
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Contribution to journal
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subject
keywords
Faunal dynamics, Carbonate microfacies, Taljsten, Darriwilian, Middle, Ordovician, Kinnekulle, Sweden
in
Palaeogeography, Palaeoclimatology, Palaeoecology
volume
367
pages
89 - 103
publisher
Elsevier
external identifiers
  • wos:000312686400009
  • scopus:84870394080
ISSN
1872-616X
DOI
10.1016/j.palaeo.2012.02.012
language
English
LU publication?
yes
id
c6b7f484-e7ef-4080-ba77-dc0f3d43ebe1 (old id 3481628)
date added to LUP
2013-02-26 12:19:38
date last changed
2017-10-08 03:13:29
@article{c6b7f484-e7ef-4080-ba77-dc0f3d43ebe1,
  abstract     = {Enclosed in the Darriwilian (Middle Ordovician) part of the reddish 'orthoceratite limestone' of Baltoscandia is a conspicuous c. 1.5 m thick unit colloquially known as the 'Taljsten' interval. It has a wide geographical distribution in the Baltoscandian paleocontinent but is particularly well exposed in south-central Sweden. The unit is characterized by its deviant gray color and beds with a mass occurrence of cystoid echinoderms. Moreover, the recent discovery of an anomalous abundance of extraterrestrial chromite grains and micrometeorites in the 'Taljsten' and immediately adjacent strata bear witness of a time of deposition correlating to an increased influx of extraterrestrial matter to Earth. In this study we analyze the faunal dynamics, based primarily on microfossils and carbonate microfacies, across this intriguing interval. Generally known as a macrolithologically monotonous succession, the 'Taljsten' proved more heterogeneous than previously believed in terms of fossil content and preservation, as well as mineral content and composition. The general texture is wackestone/packstone, but local heterogeneities are frequent. A microfaunal reorganization occurred with a transition from a trilobite- and brachiopod-dominated community to one dominated by echinoderms, which is mirrored also macroscopically by the cystoids. The latter pelmatozoans seem to have flourished and might even have aided in the formation of the numerous hardgrounds. The increase in echinoderms is linked to a Volkhovian increase in echinoderms in eastern Baltica. In the immediate post-'Taljsten' strata there is no distinct change back to the pre-'Taljsten' biota. Conodont and ostracod faunal diversity data reveal peak values in the 'Taljsten' compared to the enclosing strata, suggesting that the paleoenvironment was more suitable for higher diversity faunas of these metazoan groups. All data collectively support a regression in the beginning of the 'Taljsten', likely followed by transgression in its upper part. (C) 2012 Elsevier B.V. All rights reserved.},
  author       = {Eriksson, Mats and Lindskog, Anders and Calner, Mikael and Mellgren, Johanna and Bergstrom, Stig M. and Terfelt, Fredrik and Schmitz, Birger},
  issn         = {1872-616X},
  keyword      = {Faunal dynamics,Carbonate microfacies,Taljsten,Darriwilian,Middle,Ordovician,Kinnekulle,Sweden},
  language     = {eng},
  pages        = {89--103},
  publisher    = {Elsevier},
  series       = {Palaeogeography, Palaeoclimatology, Palaeoecology},
  title        = {Biotic dynamics and carbonate microfacies of the conspicuous Darriwilian (Middle Ordovician) 'Taljsten' interval, south-central Sweden},
  url          = {http://dx.doi.org/10.1016/j.palaeo.2012.02.012},
  volume       = {367},
  year         = {2012},
}