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dc.contributor.authorKröger, Björn
dc.contributor.authorEbbestad, Jan Ove R.
dc.contributor.authorHögström, Anette
dc.contributor.authorFrisk, Åsa M.
dc.date.accessioned2022-06-30T11:27:04Z
dc.date.available2022-06-30T11:27:04Z
dc.date.issued2011-02-01
dc.description.abstractThe Hirnantian Glisstjärn Formation (Normalograptus persculptus graptolite Biozone) is a succession of limestones and shales onlapping the Katian Boda Limestone in the Siljan District, Sweden. It contains a conspicuous, up to several decimeter thick bed densely packed with bipolarly oriented, orthoconic cephalopod conchs that can reach lengths of more than 120 cm. Conch fragmentation, bioereosion and the generally poor preservation of the conchs indicate time averaging and the conchs are tentatively interpreted as beached, and a result of winnowing. Ten nautiloid species were collected from the Glisstjärn Formation of which five are new: Dawsonoceras gregarium n. sp., Discoceras siljanense n. sp., Isorthoceras dalecarlense n. sp., Retizitteloceras rarum gen. et sp. n., and Transorthoceras osmundsbergense gen. et sp. n. The non-endemic taxa in most cases are known from elsewhere in Baltoscandia, except one species which is known from Siberia, and North America respectively. Proteocerid orthoceridans dominate the association, of which T. osmundsbergense is the predominant species. Oncocerids are diverse but together with tarphycerids very rare. Notable is the lack of many higher taxa, that are typical for other Late Ordovician shallow water depositional settings. Based on the taxonomical composition of the cephalopod mass occurrence it is interpreted as an indicator of eutrophication of the water masses in the area.en_US
dc.identifier.citationKröger B, Ebbestad, Högström A, Frisk. Mass concentration of Hirnantian cephalopods from the Siljan District, Sweden; taxonomy, palaeoecology and palaeobiogeographic relationships. Fossil Record. 2011;14(1):35-53en_US
dc.identifier.cristinIDFRIDAID 860827
dc.identifier.doi10.1002/mmng.201000014
dc.identifier.issn1435-1943
dc.identifier.issn1860-1014
dc.identifier.urihttps://hdl.handle.net/10037/25668
dc.language.isoengen_US
dc.publisherCopernicus Publicationsen_US
dc.relation.journalFossil Record
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2011 The Author(s)en_US
dc.titleMass concentration of Hirnantian cephalopods from the Siljan District, Sweden; taxonomy, palaeoecology and palaeobiogeographic relationshipsen_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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