uu.seUppsala University Publications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Faunal recovery in the Ordovician Lockne and Tvären craters
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences, Palaeobiology. Paleobiologi.
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences, Palaeobiology. Paleobiologi.
2005 (English)In: Lundadagarna i Historisk Geologi och Paleontologi IX, 2005Conference paper, Published paper (Other scientific)
Abstract [en]

FAUNAL RECOVERY IN THE ORDOVICIAN LOCKNE AND TVÄREN CRATER

Åsa Frisk1, Maurits Lindström2 & Lars Holmer1

1Uppsala University, Department of Earth Sciences, Palaeobiology, Norbyvägen 22, SE-752 36 Uppsala, Sweden.

2Stockholm University, Department of Geology and Geochemistry, SE-106 91 Stockholm, Sweden

Limited amount of work has been carried out looking at the aftermath of marine impacts; in particular the patterns of faunal recovery in and around marine craters have never been studied in detail. In Baltoscandia several marine impacts occurred during the Ordovician, and this project focuses on the Lockne and Tvären craters. The Lockne crater in Jämtland, Sweden, is well exposed on land while the Tvären crater, located under water in the Stockholm archipelago, Sweden, is available as drill cores and erratic boulders. The impacted sedimentary sequence at Tvären consisted of Ordovician carbonates resting on non-lithified sands of Early to earliest Middle Cambrian age whereas at Lockne the same kind of limestone rests on Middle to Upper Cambrian bituminous mud. After the impact events and the settling of the impact ejectas and resurge materials, deposition of carbonates continued (Dalby Limestone).

After impact the substrate became devoid of life. Large areas were affected by the local extinction of the fauna and thus provided virgin ground for the settling of marine fauna still living in the surrounding sea, though not affected by the impact. A dramatic alteration of the seafloor topography, caused by the impact, offered new habitats characterized by the crater morphology and sheltering rims. The immigrating biota, mostly consisting of chitinozoans, graptolites, trilobites, bryozoans, ostracodes, echinoderms, cephalopods and brachiopods, developed new ecosystems. Certain groups are restricted to deeper or lower water levels, varying during the sedimentation in the crater, while some occur throughout the succession. A detailed biostratigraphic study of the post-impact succession in the craters is being carried out in order to understand how the abundance of species changed in relation to the varied environments and how the pre-impact faunal groups recovered gradually as life returned onto a sterile seafloor.

Place, publisher, year, edition, pages
2005.
Identifiers
URN: urn:nbn:se:uu:diva-75210OAI: oai:DiVA.org:uu-75210DiVA: diva2:103120
Available from: 2006-02-15 Created: 2006-02-15

Open Access in DiVA

No full text

Authority records BETA

Frisk, ÅsaHolmer, Lars

Search in DiVA

By author/editor
Frisk, ÅsaHolmer, Lars
By organisation
Department of Earth SciencesPalaeobiology

Search outside of DiVA

GoogleGoogle Scholar

urn-nbn

Altmetric score

urn-nbn
Total: 497 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf