Blar i forfatter Norges arktiske universitetsmuseum "Högström, Anette"

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    • Mass concentration of Hirnantian cephalopods from the Siljan District, Sweden; taxonomy, palaeoecology and palaeobiogeographic relationships 

      Kröger, Björn; Ebbestad, Jan Ove R.; Högström, Anette; Frisk, Åsa M. (Journal article; Tidsskriftartikkel; Peer reviewed, 2011-02-01)
      The 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 ...

    • New information on the Ediacaran-Cambrian transition in the Vestertana Group, Finnmark, northern Norway, from trace fossils and organic-walled microfossils 

      Högström, Anette; Jensen, Sören; Palacios, Teodoro; Ebbestad, Jan Ove R. (Journal article; Tidsskriftartikkel; Peer reviewed, 2013)
      The Vestertana Group on the Digermul Peninsula, Finnmark, northern Norway, presents one of the few, potentially continuous Ediacaran– Cambrian sections in Scandinavia. Trace fossils provide the main age constraint, with the boundary traditionally placed at the base of the Breidvika Formation. Here, we provide trace-fossil evidence to show that this boundary is at least as low as the third cycle of ...

    • A new interpretation of the sedimentary cover in the western Siljan Ring area, central Sweden, based on seismic data. 

      Juhlin, Christoffer; Sturkell, Erik; Ebbestad, Jan Ove R.; Lehnert, Oliver; Högström, Anette; Meinhold, Guido (Journal article; Tidsskriftartikkel; Peer reviewed, 2012)
      Two new reflection seismic profiles over the Paleozoic successions of the western part of the Siljan Ring impact structure show a contrasting seismic signature. The more southerly c. 10 km long Mora profile reveals a highly disturbed structure, with only a few kilometers of relatively horizontally layered structures observed. However, interpretations of refracted arrivals in the data, that can be ...

    • New occurrences of Palaeopascichnus from the Stáhpogieddi Formation, Arctic Norway, and their bearing on the age of the Varanger Ice Age. 

      Jensen, Sören; Högström, Anette; Høyberget, Magne; Meinhold, Guido; McIlroy, Duncan; Ebbestad, Jan Ove R.; Taylor, Wendy L.; Agic, Heda; Palacios, Teodoro (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-09-18)
      We report on new occurrences of the late Ediacaran problematicum <i>Palaeopascichnus</i> (Protista?) from the Stáhpogieddi Formation, Arctic Norway. The stratigraphically lowest occurrences are in beds transitional between the Lillevannet and Indreelva members: the highest in the second cycle of the Manndrapselva Member, stratigraphically close to the lowest occurrences of Cambrian-type trace fossils. ...

    • Rare earth elements and neodymium and strontium isotopic constraints on provenance switch and post-depositional alteration of fossiliferous Ediacaran and lowermost Cambrian strata from Arctic Norway. 

      Meinhold, Guido; Willbold, Matthias; Karius, Volker; Jensen, Sören; Agić, Heda; Ebbestad, Jan Ove R.; Palacios, Teodoro; Högström, Anette; Høyberget, Magne; Taylor, Wendy L. (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-09-16)
      The Digermulen Peninsula in northeastern Finnmark, Arctic Norway, comprises one of the most complete Ediacaran–Cambrian transitions worldwide with a nearly continuous record of micro- and macrofossils from the interval of the diversification of complex life. Here, we report on the provenance and post-depositional alteration of argillaceous mudstones from the Digermulen Peninsula using rare earth ...

    • Scratch circles from the Ediacaran and Cambrian of Arctic Norway and the Republic of South Africa, with a review of scratch circle ocurrences 

      Jensen, Sören; Högström, Anette; Almond, John E.; Taylor, Wendy L.; Meinhold, Guido; Høyberget, Magne; Ebbestad, Jan Ove R.; Agic, Heda; Palacios, Teodoro (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-07-13)
      Scratch circles - bedding plane parallel sedimentary structures formed by the passive rotation of a tethered organism into the surrounding sediment - are relatively rare in the geological record. Here new occurrences of scratch circles are described from the Ediacaran-Cambrian Stáhpogieddi Formation, Digermulen Peninsula, Arctic Norway, and from the Ediacaran Nudaus and Urusis formations, Nama Group, ...