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norskBlar i forfatter "Högström, Anette"
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Acritarchs from the Duolbagáisá Formation (Cambrian Series 2-Miaolingian) on the Digermulen Peninsula, Finnmark, Arctic Norway: towards a high-resolution Cambrian chronostratigraphy
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-04-24)New information on acritarchs from the Duolbagáisá Formation, Digermulen Peninsula, Arctic Norway, enable recognition of the three Cambrian Series 2 acritarch-based zones: the <i>Skiagia ornata–Fimbriaglomerella membranacea, Heliosphaeridium dissimilare–Skiagia ciliosa and Volkovia dentifera–Liepaina plana</i> Assemblage zones. Acritarchs of the <i>Skiagia ornata–Fimbriaglomerella membranacea</i> ... -
Distribution and correlation of Sabellidites cambriensis (Annelida?) in the basal Cambrian on Baltica
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-12-09)Sabellidites cambriensis is a tubular non-mineralized metazoan that appears as compressed ribbon-shaped imprints with transverse wrinkling, thick walls and an even tube diameter of up to 3 mm. The distribution of Sabellidites is investigated in three Ediacaran–Cambrian sections on the Digermulen Peninsula in Arctic Norway, spanning the Manndrapselva Member of the Stáhpogieddi Formation and the lower ... -
First record of carbonates with spherulites and cone-in-cone structures from the Precambrian of Arctic Norway, and their palaeoenvironmental significance
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-04-10)We report for the first time carbonates from the upper Ediacaran sedimentary succession of Finnmark, Arctic Norway. Carbonates occur as calcareous siliciclastic beds, lenses, and concretions, some with calcite spherulites and cone-in-cone (CIC) calcite, in a mudrock to fine-grained sandstone succession from approximately 3 m to 26 m above the base of the 2nd cycle of the Manndrapselva Member of the ... -
A late Caledonian tectono-thermal event in the Gaissa Nappe Complex, Arctic Norway: evidence from fine-fraction K‒Ar dating and illite crystallinity from the Digermulen Peninsula
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-03)Fine-fraction K‒Ar dating and illite crystallinity determination were applied on a peculiar pale olive green shale sample from the upper Ediacaran Indreelva Member (Stáhpogieddi Formation, Vestertana Group, Gaissa Nappe Complex) of the Digermulen Peninsula in Finnmark, Arctic Norway, to constrain the age and metamorphic conditions of tectono-thermal overprint. The <2 and <0.2 µm grain-size fractions ... -
Late Ediacaran occurrences of the organic-walled microfossils Granomarginata and flask-shaped Lagoenaforma collaris gen. et sp. nov.
(Journal article; Tidsskriftartikkel; Peer reviewed, 2021-11-12)New occurrences of flask-shaped and envelope-bearing microfossils, including the predominantly Cambrian taxon Granomarginata, are reported from new localities, as well as from earlier in time (Ediacaran) than previously known. The stratigraphic range of Granomarginata extends into the Cambrian System, where it had a cosmopolitan distribution. This newly reported Ediacaran record includes areas from ... -
Mass concentration of Hirnantian cephalopods from the Siljan District, Sweden; taxonomy, palaeoecology and palaeobiogeographic relationships
(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
(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.
(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 ... -
A new large mound dwelling chiton (Mollusca), from the Late Ordovician Boda Limestone of central Sweden
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-09-24)A new rare Upper Ordovician mound dwelling palaeoloricate chiton is described as <i>Crassaplax collicola</i> gen. et sp. nov. from three large isolated intermediate valves from the Katian carbonate mud mounds of the Boda Limestone in the Siljan district of central Sweden. Together with the previously known <i>Spicuchelodes</i>? sp., also from the Boda Limestone, these are the only known Late Ordovician ... -
New occurrences of Palaeopascichnus from the Stáhpogieddi Formation, Arctic Norway, and their bearing on the age of the Varanger Ice Age.
(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. ... -
Organically-preserved multicellular eukaryote from the late Neoproterozoic Nyborg Formation, Arctic Norway.
(Journal article; Tidsskriftartikkel; Peer reviewed, 2019-10-10)Eukaryotic multicellularity originated in the Mesoproterozoic Era and evolved multiple times since, yet early multicellular fossils are scarce until the terminal Neoproterozoic and often restricted to cases of exceptional preservation. Here we describe unusual organically-preserved fossils from mudrocks, that provide support for the presence of organisms with differentiated cells (potentially an ... -
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.
(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
(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, ... -
Trace fossils from the Upper Member of the Duolbagáisá Formation (Cambrian Series 2-Miaolingian), northern Norway, with the first diverse Cambrian record of Halimedides
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-11-30)New information is provided on trace fossils from the Cambrian Series 2 toNew information is provided on trace fossils from the Cambrian Series 2 toMiaolingian in the Upper Member of the Duolbagáisá Formation of northern Norway. This includes the first rich Cambrian material of Halimedides, a tracefossil with more or less regularly spaced swellings of different shapesconnected by a median string. ... -
U-Pb dating of calcite in ancient carbonates for age estimates of syn-to post-depositional processes: A case study from the upper Ediacaran strata of Finnmark, Arctic Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-10)Results of in situ U–Pb dating of calcite spherulites, cone-in-cone (CIC) calcite and calcite fibres from a calcareous concretion of the upper Ediacaran of Finnmark, Arctic Norway, are reported. Calcite spherulites from the innermost layers of the concretion yielded a lower intercept age of 563 ± 70 Ma, which, although imprecise, is within uncertainty of the age of sedimentation based on fossil ... -
U–Pb dating of calcite in ancient carbonates for age estimates of syn- to post-depositional processes: a case study from the upper Ediacaran of Finnmark, Arctic Norway
(Journal article; Tidsskriftartikkel; Peer reviewed, 2020-06-10)Results of <i>in situ</i> U–Pb dating of calcite spherulites, cone‐in‐cone (CIC) calcite and calcite fibres from a calcareous concretion of the upper Ediacaran of Finnmark, Arctic Norway, are reported. Calcite spherulites from the innermost layers of the concretion yielded a lower intercept age of 563 ± 70 Ma, which although imprecise, is within uncertainty of the age of sedimentation based on fossil ...
