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The Ordovician Tøyen Shale (Floian) and its graptolite fauna at Kinnekulle, Västergötland, Sweden – a regional overview GFF (IF 1.0) Pub Date : 2023-12-26 Jörg Maletz, Anders Lindskog, Mikael Calner, Åsa Wallin
The graptolites of the Tøyen Shale Formation of Kinnekulle in Västergötland, south-central Sweden, are described for the first time and their biostratigraphic distribution is documented from drill ...
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The “Lund Moraine” – the geomorphic limit of the last Young Baltic ice advance in the Öresund region GFF (IF 1.0) Pub Date : 2023-12-21 Carl Regnéll, Helena Alexanderson, Sarah L. Greenwood, Richard Gyllencreutz, Christian Öhrling
Here we present geomorphological evidence of a previously unrecognised ∼50 km long, ice-marginal moraine complex in southwestern Skåne, southernmost Sweden, which we name the “Lund Moraine”. This l...
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High diversity and early radiation of organic-walled phytoplankton in southern Baltica during the Middle-Late Ordovician – evidence from the Borenshult-1 drillcore of southern Sweden GFF (IF 1.0) Pub Date : 2023-10-31 Claudia V. Rubinstein, Vivi Vajda
Highly diverse and well preserved organic-walled phytoplankton were recorded from the Darriwilian–early Katian interval of the Borenshult-1 drillcore. We identified 154 species in 53 genera, and th...
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Pore-canal network (“wrinkles”) in ammonoid shell wall (Cephalopoda) GFF (IF 1.0) Pub Date : 2023-10-31 Harry Mutvei
The shell wall in ammonoids contains a pore-canal network similar to that detected recently in the shell wall of the Ordovician nautiloid Orthoceras. In the Jurassic monomorphic ammonoids Quenstedt...
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The development of dark shales from the middle and late Cambrian to early Ordovician on the East European Platform – with focus on Gotland GFF (IF 1.0) Pub Date : 2023-10-26 Stefan E. Hagenfeldt, Erik Palmlöv, Aleksey Amantov, Jonas Hagström, Rémy Ghalayini, Thomas Liljedahl
By compiling data from literature and unpublished reports a more detailed description is presented on the geographical and stratigraphic distribution of the Alum Shale Formation (ASF) and correlate...
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Shell injuries, repair and malformation in the early Cambrian mollusc Helcionella antiqua from Scania, Sweden GFF (IF 1.0) Pub Date : 2023-08-10 Jan Ove R. Ebbestad, Peter Cederström, John S. Peel
Three cases of repaired injuries and malformation in specimens of the helcionelloid mollusc Helcionella antiqua (Kiær, 1917) from the lower Cambrian (Cambrian Series 2, Stage 4) Gislöv Formation of...
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Stable carbon and oxygen isotope geochemistry as provenance indicator for the picture stones on Gotland (Sweden) GFF (IF 1.0) Pub Date : 2023-08-02 Patrick Hänsel, Sigmund Oehrl, Lena Ideström, Per Widerström, Carl J. Reddin, Axel Munnecke
The picture stones from Gotland are one of the most famous and exceptional groups of monuments known from Swedish Prehistory. These carved memorial stones and their extraordinarily rich imagery are...
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Unusual cystoporate? bryozoan from the Upper Ordovician of Siljan District, Dalarna, central Sweden GFF (IF 1.0) Pub Date : 2023-08-01 Andrej Ernst, Zoya Tolokonnikova
Suecipora ebbestadi gen. n. sp. n. (Bryozoa) is described from the Upper Ordovician of Siljan District, Dalarna, central Sweden. This taxon is characterized by long peristome-like tubes with keel-s...
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U-Pb baddeleyite age for the Ottfjället Dyke Swarm, central Scandinavian Caledonides: new constraints on the timing of the Baltoscandian Dyke Swarm, opening of the Iapetus Ocean and Neoproterozoic glaciation of Baltica – comment on the inferred age of Neoproterozoic glaciation on Baltica – a reply GFF (IF 1.0) Pub Date : 2023-07-25 Risto A. Kumpulainen, Mike A. Hamilton, Ulf Söderlund, Johan Petter Nystuen
Published in GFF (Vol. 144, No. 3-4, 2022)
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Late Paleoproterozoic deposition and Mesoproterozoic metamorphism of detrital material in the southernmost Baltic Sea region (Gdańsk IG1 borehole): monazite versus zircon and chemical versus isotopic age record GFF (IF 1.0) Pub Date : 2023-06-15 Dominik Gurba, Anna Grabarczyk-Gurba, Ewa Krzemińska
The SHRIMP ion microprobe zircon and monazite U–Th–Pb isotope geochronology of a biotite-sillimanite paragneiss derived from the Gdańsk IG1 borehole that penetrated the Precambrian basement in the ...
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U-Pb baddeleyite age for the Ottfjället Dyke Swarm, central Scandinavian Caledonides: New constraints on Ediacaran opening of the Iapetus Ocean and glaciations on Baltica – a comment on the inferred age of Neoproterozoic glaciations GFF (IF 1.0) Pub Date : 2023-06-14 A. Hugh N. Rice
Published in GFF (Vol. 144, No. 3-4, 2022)
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Emendment to the term complex in: “Guide for geological nomenclature in Sweden” (Kumpulainen 2016) GFF (IF 1.0) Pub Date : 2023-05-18 Ulf Bertil Andersson, Nils Jansson, Linda Wickström, Stefan Bergman, Risto Kumpulainen, Mark Johnson, Mats Olvmo, Stephen McLoughlin, Mikael Calner
Published in GFF (Vol. 144, No. 3-4, 2022)
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Prehistory of an enigmatic mineral: hisingerite GFF (IF 1.0) Pub Date : 2023-04-04 Dan Holtstam
According to most sources, the type locality for the hydrous iron silicate mineral hisingerite is Riddarhyttan, Västmanland, Sweden, first reported in 1828. However, it was described by A.F. Cronst...
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Cobalt enrichment in some ores of the Bergslagen province, south central Sweden GFF (IF 1.0) Pub Date : 2023-02-21 Erik Jonsson, Karin Högdahl
The presence of cobalt (Co) in sulphide deposits or sulphide-bearing iron oxide deposits in and around the Palaeoproterozoic Bergslagen ore province, south central Sweden, led to focused mining and...
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Solstad, a Co-Se-bearing copper ore in the Västervik quartzites, Sweden GFF (IF 1.0) Pub Date : 2022-12-15 Kjell Billström, Johan Söderhielm, Curt Broman, Krister Sundblad
The Solstad copper deposit, located in SE Sweden, is hosted by a quartz-rich rock sliver surrounded by a granite belonging to the 1.8 Ga Transscandinavian Igneous Belt. Ore petrographic studies hav...
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A new dallasiellid shark from the lower Campanian (Upper Cretaceous) of Sweden GFF (IF 1.0) Pub Date : 2022-10-03 Mikael Siversson, Peter Cederström, Helen E. Ryan
ABSTRACT Examination of isolated shark teeth from the uppermost lower Campanian Gonioteuthis quadrata scaniensis Zone of southern Sweden revealed the presence of a rare, previously undescribed lamniform shark. The unusually small-sized anterior teeth, variable presence of a short and shallow median groove, cusplet shape and outline of posterior teeth indicate a dallasiellid affinity and the species
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Hydrothermal alteration, lithogeochemical marker units and vectors towards mineralisation at the Svärdsjö Zn-Pb-Cu deposit, Bergslagen, Sweden GFF (IF 1.0) Pub Date : 2022-10-03 Anton Fahlvik, Tobias C. Kampmann, Nils F. Jansson
The Svärdsjö Zn-Pb-Cu deposit is situated in the heavily mineralised Bergslagen lithotectonic unit of the Fennoscandian shield, south-central Sweden. Intense hydrothermal alteration followed by a s...
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Hitherto undetected pore-canal network in the shell wall of the Ordovician Orthoceras from Baltoscandia (Cephalopoda: orthoceratida, calciosiphonata) GFF (IF 1.0) Pub Date : 2022-09-27 Harry Mutvei
The structure of the shell wall in the Ordovician Orthoceras differs from that in the extant Nautilus. It consists of two equal thick layers: an outer probably nacreous layer and an inner prismatic...
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Inversion tectonics in the Sorgenfrei–Tornquist Zone: insight from new marine seismic data at the Bornholm Gat, SW Baltic Sea GFF (IF 1.0) Pub Date : 2022-08-16 Yaocen Pan, Elisabeth Seidel, Christopher Juhlin, Christian Hübscher, Daniel Sopher
ABSTRACT New seismic profiles located within the Bornholm Gat in the SW Baltic Sea area image Late Cretaceous-Paleogene inversion and exhumation of a previously poorly characterized narrow crustal zone in the southern end of the Sorgenfrei–Tornquist Zone (STZ), a long pre-Alpine tectonic lineament in Europe. Thrusts and pop-up structures developed along the inversion axis accompanied by subsidence
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The Holocene of Sweden – a review GFF (IF 1.0) Pub Date : 2022-07-18 Stefan Wastegård
ABSTRACT This paper presents a review on more than hundred years of palaeoenvironmental research in Sweden; from early descriptions of peat and tufa deposits in the late nineteenth and early twentieth centuries to multiproxy transfer function studies in the late twentieth and early twenty-first centuries CE. Research on Holocene climate variability has a long history in Sweden and many ideas and concepts
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Contrasting coronas: microscale fluid variation deduced from monazite breakdown products in altered metavolcanic rocks associated with the Grängesberg apatite-iron oxide ore, Bergslagen, Sweden GFF (IF 1.0) Pub Date : 2022-06-20 Jarosław Majka, Adam Włodek, Erik Jonsson, Karin Högdahl
ABSTRACT Three different types of secondary coronas developed around monazite-(Ce) were discovered in altered metavolcanic rocks closely associated with the Palaeoproterozoic apatite-iron oxide ore deposit in Grängesberg, Sweden. All three types of reaction coronas include fluorapatite that is either rimmed by allanite-(Ce), REE-fluorocarbonate(s), or hingganite-(Y). The latter mineral has not been
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First record of an Early Ordovician brachiopod and conodont fauna from Lapland, Sweden GFF (IF 1.0) Pub Date : 2022-06-09 Michael Streng, Jan Audun Rasmussen, Jan Ove R. Ebbestad, Thomas Weidner
ABSTRACT An Early Ordovician fauna of linguliform brachiopods and euconodonts is described from the Alum Shale Formation in northernmost Västerbotten County, northern Sweden. The fauna was recovered from a single carbonate concretion collected at an exposure near the northern shore of Lake Storvindeln. Despite of the fragmentary and tectonized preservation of the obtained fossils, at least eight different
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The oldest tongue worm: a stem-group pentastomid arthropod from the early middle Cambrian (Wuliuan Stage) of North Greenland (Laurentia) GFF (IF 1.0) Pub Date : 2022-05-23 John S. Peel
ABSTRACT Rare phosphatised fragments within small shelly fossil assemblages from the upper Henson Gletscher Formation (Cambrian, Miaolingian Series, Wuliuan Stage) of North Greenland (Laurentia) are described as Dietericambria hensoniensis n. gen. n. sp. Two pairs of minute cephalic limbs promote comparison with stem-group pentastomids, best known from the late Cambrian (Furongian) Orsten Lagerstätten
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New encrusting tentaculitoids from the Silurian of Estonia and taxonomic status of Anticalyptraea Quenstedt, 1867 GFF (IF 1.0) Pub Date : 2022-04-11 Michał Zatoń, Olev Vinn, Ursula Toom, Jakub Słowiński
ABSTRACT A new genus and species of encrusting tentaculitoid, Lindstroemiella eichwaldi, from the Silurian (Ludfordian Stage, Ludlow) of Saaremaa Island in Estonia, is described. This tentaculitoid shares common structural features (inwardly directed pseudopunctae and vesicles) with Anticalyptraea, but differs from the latter in having a spirally coiled, microconchid-like shell with a variously oriented
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The Middle Ordovician Jinonicella (Mollusca) from Belarus and Ukraine GFF (IF 1.0) Pub Date : 2022-04-11 Alexander P. Gubanov, Sofia Bakayeva, Jan Ove R. Ebbestad, Olga K. Bogolepova
ABSTRACT The oldest known specimens of the enigmatic mollusc Jinonicella kolebabai Pokorný, 1978 are redescribed from Middle Ordovician strata of Ukraine and Belarus. The phosphatic internal moulds preserve imprints of growth lines, hitherto only documented in Silurian specimens. The persistent distribution of Jinonicella in the Baltoscandian basin of the Russian Platform suggests that this was the
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Sandbian (Late Ordovician) conodonts in Estonia: distribution and biostratigraphy GFF (IF 1.0) Pub Date : 2022-02-14 Tõnn Paiste, Peep Männik, Tõnu Meidla
ABSTRACT The boundaries of the Sandbian Stage are defined by graptolites. Because of their rare occurrence in the Estonian part of the Baltoscandian palaeobasin, other fossils, including conodonts, are used for biostratigraphy as good alternatives. Since the definition of Sandbian Stage/Age in 2002, information about conodonts from this time interval in Baltsocandia has improved considerably. In this
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Has the tectonic regime of the Baltic Shield always remained the same? GFF (IF 1.0) Pub Date : 2022-02-08 Anders Lindh
ABSTRACT Recent theories on the growth of continental crust stress its formation in pre-Archean and Archean times with minor additions at later times. The Earth has gone through a unidirectional evolution including surface changes, the genesis of life and an important loss of energy. The energy loss drives tectonic processes, but at a rate declining with available energy and thus with time. Semiquantitative
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Two trepostome bryozoans from the Assistance Formation (Permian, Roadian) near Lake Hazen, Ellesmere Island, Canada GFF (IF 1.0) Pub Date : 2021-11-17 Andrej Ernst, Hans Arne Nakrem
ABSTRACT Rhombotrypella superangustata and Dyscritellina fuglensis (Bryozoa, Trepostomata) were found for the first time in the Assistance Formation of Ellesmere Island, Canada. Both species correlate the Roadian age of the Assistance Formation with contemporary deposits in Northern Russia and Bjørnøya, Norway. They possess robust erect colonies adapted for shallow shelf conditions with moderate energy
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Holdfasts of Sphenothallus (Cnidaria) from the early Silurian of western North Greenland (Laurentia) GFF (IF 1.0) Pub Date : 2021-10-21 John S. Peel
ABSTRACT Well-preserved holdfasts and early growth stages of the tubular cnidarian Sphenothallus are described from the early Silurian (Llandovery Series) of Washington Land, North Greenland. The diameter of the holdfast is determined by the formation of a basal disc attached to the substrate, upon which the initially conical, but subsequently tubular shell is formed. The characteristic opposing longitudinal
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Advances in Swedish palaeontology; the importance of fossils in natural history collections - The Department of Palaeobiology at the Swedish Museum of Natural History GFF (IF 1.0) Pub Date : 2021-10-19 Vivi Vajda, Christian B. Skovsted
(2021). Advances in Swedish palaeontology; the importance of fossils in natural history collections - The Department of Palaeobiology at the Swedish Museum of Natural History. GFF: Vol. 143, Special Issue: Advances in Swedish palaeontology; the importance of fossils in natural history collections – The Department of Palaeobiology at the Swedish Museum of Natural History, pp. 93-102.
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Trace fossils, algae, invertebrate remains and new U-Pb detrital zircon geochronology from the lower Cambrian Torneträsk Formation, northern Sweden GFF (IF 1.0) Pub Date : 2021-09-17 Stephen McLoughlin, Vivi Vajda, Timothy P. Topper, James L. Crowley, Fan Liu, Ove Johansson, Christian B. Skovsted
ABSTRACT Nineteen ichnotaxa, together with algal and invertebrate remains, and various pseudo-traces and sedimentary structures are described from the Torneträsk Formation exposed near Lake Torneträsk, Lapland, Sweden, representing a marked increase in the diversity of biotic traces recorded from this unit. The “lower siltstone” interval of the Torneträsk Formation contains mostly simple pascichnia
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Neutron tomography, fluorescence and transmitted light microscopy reveal new insect damage, fungi and plant organ associations in the Late Cretaceous floras of Sweden GFF (IF 1.0) Pub Date : 2021-09-15 Stephen McLoughlin, Adam T. Halamski, Chris Mays, Jiří Kvacek
ABSTRACT Neutron tomographic reconstructions, macrophotography, transmitted light microscopy and fluorescence microscopy are employed to assess the quality of organic preservation, determine organ associations, identify insect damage, and document fungal interactions with selected Santonian–lower Campanian plant fossils from the northern Kristianstad Basin, southern Sweden. Fricia nathorstii (Conwentz)
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Cleaning up the record – revised U-Pb zircon ages and new Hf isotope data from southern Sweden GFF (IF 1.0) Pub Date : 2021-10-06 Åke Johansson
ABSTRACT Ten samples of felsic plutonic rocks from the Eastern Segment of the Sveconorwegian Orogen in southern Sweden, previously dated by ID-TIMS on zircon, have been dated anew using SIMS spot analysis of individual zircon grains, leading to more reliable and in most cases also more precise revised magmatic crystallization ages. A gneissic monzonite within the Protogine Zone in Småland yields a
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Upper Darriwilian (Middle Ordovician) graptolite biostratigraphy and correlation of the Krapperup drill core, Scania, Sweden GFF (IF 1.0) Pub Date : 2021-09-13 Jörg Maletz, Per Ahlberg
ABSTRACT The Krapperup drill core from Scania (Skåne), southern Sweden, includes one of the most important graptolitic Darriwilian (upper Middle Ordovician) successions of Baltica. Only some intervals have been documented previously and especially the uppermost part of the succession has been completely unknown. A fairly complete succession of mid- to late Darriwilian age provides insight into the
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Authigenic calcium carbonate precipitation in the “bathtub ring” around the anoxic Alum Shale Basin during the Furongian SPICE event (Baltic Basin, northern Poland) GFF (IF 1.0) Pub Date : 2021-09-08 Aleksander Majchrzyk, Wojciech Kozłowski, Anna Żylińska
ABSTRACT The precipitation of both biotic and abiotic calcium carbonate is of great importance in modern and ancient global biogeochemical cycles. In the present-day oceans, the widespread precipitation of inorganic CaCO3 on the seafloor or in the water column is possible only under extraordinary circumstances. By contrast, in the geological record, authigenic seafloor carbonate cements were widespread
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Introducing palaeolithobiology GFF (IF 1.0) Pub Date : 2021-07-27 Magnus Ivarsson, Henrik Drake, Anna Neubeck, Oona Snoeyenbos-West, Veneta Belivanova, Stefan Bengtson
ABSTRACT A growing literature of deep but also surficial fossilized remains of lithobiological life, often associated with igneous rocks, necessitates the unfolding of a sub-discipline within paleobiology. Here, we introduce the term paleolithobiology as the new auxiliary sub-discipline under which fossilized lithobiology should be handled. We present key criteria that distinguish the paleolithobiological
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Dispersed pollen and calyx remains of Diospyros (Ebenaceae) from the middle Miocene “Plant beds” of Søby, Denmark GFF (IF 1.0) Pub Date : 2021-07-26 Thomas Denk, Johannes M. Bouchal
ABSTRACT Diospyros is a large genus of woody flowering plants with a predominantly subtropical and tropical modern distribution. Fossils attributed to Diospyros are mainly leaf impressions from Cretaceous and Cenozoic strata across the Northern Hemisphere. However, it is difficult to assign such fossils to Diospyros because genus-diagnostic leaf characteristics remain to be identified. Unequivocal
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A new small-sized penguin from the late Eocene of Seymour Island with additional material of Mesetaornis polaris GFF (IF 1.0) Pub Date : 2021-07-26 Piotr Jadwiszczak, Marcelo Reguero, Thomas Mörs
ABSTRACT Here, we report on two tarsometatarsi assignable to relatively small-sized Eocene Antarctic penguins, housed in the palaeozoological collections of Naturhistoriska riksmuseet, Stockholm. The Priabonian fossils were collected by museum staff during two joined Argentinean and Swedish expeditions from the Submeseta Formation on Seymour Island, Antarctic Peninsula. One specimen represents a new
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3D imaging of shark egg cases (Palaeoxyris) from Sweden with new insights into Early Jurassic shark ecology GFF (IF 1.0) Pub Date : 2021-07-26 Ashley Krüger, Sam Slater, Vivi Vajda
ABSTRACT Several shark species produce egg cases as protective casings in which their embryos develop. These casings are composed of multiple layers of collagen and are extremely durable, making them prone to fossilisation. Here we document Palaeoxyris (Spirangium) ‒ fossil shark egg cases from Lower Jurassic successions of southern Sweden. We present high-resolution 3D images of Palaeoxyris based
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Fish otoliths from the middle Paleocene (Selandian) of southern Sweden GFF (IF 1.0) Pub Date : 2021-07-26 Werner W. Schwarzhans, Thomas Mörs
ABSTRACT The first fossil otolith association from the middle Paleocene (Selandian) of Scania, southern Sweden is described. Forty-seven otoliths were retrieved from shallow wells representing 14 teleost taxa. Many specimens are small and/or eroded and, therefore, not identifiable to species level. Nevertheless, our findings indicate the potential for further fossil otolith discoveries in the region
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Megaspores from the Late Triassic‒Early Jurassic of southern Scandinavia: taxonomic and biostratigraphic implications GFF (IF 1.0) Pub Date : 2021-07-22 Jungang Peng, Sam M. Slater, Vivi Vajda
ABSTRACT Here we investigate megaspores from 10 Triassic‒Jurassic localities of southern Sweden and Bornholm, Denmark, based on collections housed in the Swedish Museum of Natural History. We identify and describe 19 megaspore taxa belonging to three stratigraphically constrained assemblages, representing the Rhaetian, Hettangian and Pliensbachian, respectively. Megaspores are abundant and diverse
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Searching for a nearest living equivalent for Bennettitales: a promising extinct plant group for stomatal proxy reconstructions of Mesozoic pCO2 GFF (IF 1.0) Pub Date : 2021-07-22 Margret Steinthorsdottir, Caroline Elliott-Kingston, Mario Coiro, Jennifer C. McElwain
ABSTRACT To understand Earth´s climate variability and improve predictions of future climate change, studying past climates is an important avenue to explore. A previously published record of pCO2, across the Triassic–Jurassic boundary (TJB, ~201 Ma) of East Greenland, showed that Bennettitales (Anamozamites and Pterophyllum) responded in parallel to the empirically proven pCO2-responders Ginkgoales
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Revision of thelodonts, acanthodians, conodonts, and the depositional environments in the Burgen outlier (Ludlow, Silurian) of Gotland, Sweden GFF (IF 1.0) Pub Date : 2021-07-22 Emilia Jarochowska, Oskar Bremer, Alexandra Yiu, Tiiu Märss, Henning Blom, Thomas Mörs, Vivi Vajda
ABSTRACT Ludfordian strata exposed in the Burgen outlier in eastern Gotland, Sweden record a time of initial faunal recovery after a global environmental perturbation manifested in the Ludfordian Carbon Isotope Excursion (LCIE). Vertebrate microfossils in the collection of the late Lennart Jeppsson, hosted at the Swedish Museum of Natural History, hold the key to reconstruct the dynamics of faunal
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The youngest known tommotiid: Lapworthella bornholmiensis (Poulsen, 1942) from Cambrian Stage 4 to Guzhangian (Miaolingian) strata of Bornholm and southern Sweden GFF (IF 1.0) Pub Date : 2021-07-22 Léa Devaere, Christian B. Skovsted
ABSTRACT The Camenellan tommotiid Lapworthella bornholmiensis is systematically revised based on the original type material and collections of Small Shelly Fossils at the Swedish Museum of Natural History. The species is clearly differentiated from all other species of Lapworthella by its unique surface ornamentation. Variability in sclerite shape is analyzed among the 39 specimens and four sclerite
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First discovery of Small Shelly Fossils and new occurrences of brachiopods and trilobites from the early Cambrian (Stage 4) of the Swedish Caledonides, Lapland GFF (IF 1.0) Pub Date : 2021-07-22 Christian B. Skovsted, Timothy P. Topper, Stephen McLoughlin, Ove Johansson, Fan Liu, Vivi Vajda
ABSTRACT New fossil discoveries are reported from the Grammajukku Formation at Luobákte south of Lake Torneträsk in northern Swedish Lapland, including a fauna of Small Shelly Fossils (SSF) from a limestone bed in the uppermost part of the formation and new occurrences of brachiopods and trilobites in siltstones of the lower part of the formation. The moderately diverse SSF fauna is the first of its
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Rock fracturing by subglacial hydraulic jacking in basement rocks, eastern Sweden: the role of beam failure GFF (IF 1.0) Pub Date : 2021-07-15 Maarten Krabbendam, Romesh Palamakumbura, Christian Arnhardt, Adrian Hall
ABSTRACT Dense networks of dilated fractures occur locally in the upper 5–15 m of bedrock in basement gneisses in eastern Sweden. Near Forsmark, pre-existing sub-horizontal fractures have been jacked open and filled with water-lain sediment, likely during the latest Weichselian glaciation. Despite extensive previous research, it is uncertain whether subglacial hydraulic jacking led to the generation
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Time constraints on the deposition of a mineralisation-proximal metavolcaniclastic rock at Byngsbodberget, northwest of Falun, Bergslagen, Sweden GFF (IF 1.0) Pub Date : 2021-05-04 Alexander Lewerentz, Magnus Ripa, George Morris
ABSTRACT Metavolcanic rocks in the area north and northwest of Falun, Bergslagen, Sweden host numerous mineralisations and historic mines. The stratigraphy and formation ages of these metavolcanic rocks however remains unresolved on the local scale. This study aims to add at least some pieces to that puzzle by exploring age-constrains for the deposition of a metavolcaniclastic rock at Byngsbodberget
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Eldoradia and Acrocephalops (Trilobita: Bolaspididae) from the middle Cambrian (Miaolingian) of northern Greenland (Laurentia) GFF (IF 1.0) Pub Date : 2021-03-01 John S. Peel
ABSTRACT The ptychoparioid trilobites Eldoradia and Acrocephalops (Family Bolaspididae) are described from the middle Cambrian (Miaolingian Series) of northern Greenland (Laurentia). Eldoradia, originally described from the Secret Canyon Shale of Nevada, is recorded from south-western Wulff Land, North Greenland, where it occurs together with Modocia and Olenoides. Eldoradia caerulioris n. sp. is established
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U-Pb baddeleyite age for the Ottfjället Dyke Swarm, central Scandinavian Caledonides: new constraints on Ediacaran opening of the Iapetus Ocean and glaciations on Baltica GFF (IF 1.0) Pub Date : 2021-04-21 R. A. Kumpulainen, M. A. Hamilton, U. Söderlund, J. P. Nystuen
ABSTRACT The Ottfjället Dyke Swarm (ODS) is a prominent component of the Ediacaran mafic magmatism associated with opening of the Iapetus ocean, and hosted in the Särv Nappe, Middle Allochthon of the Scandinavian Caledonides. A U-Pb baddeleyite age of 596.3 ± 1.5 Ma for a thick, well preserved, plagioclase-phyric dolerite dyke in Härjedalen, Sweden, dates emplacement of the swarm. The age represents
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Muonionalustaite, Ni3(OH)4Cl2·4H2O, a new mineral formed by terrestrial weathering of the Muonionalusta iron (IVA) meteorite, Pajala, Norrbotten, Sweden GFF (IF 1.0) Pub Date : 2021-02-02 Dan Holtstam, Luca Bindi, Andreas Karlsson, Johan Söderhielm, Anders Zetterqvist
ABSTRACT Muonionalustaite, ideally Ni3(OH)4Cl2 · 4H2O, is a new mineral species (IMA 2020–010), found as a terrestrial weathering product of the Muonionalusta iron meteorite, in a fragment excavated 1.5 km NE of Lake Kitkiöjärvi in northernmost Sweden. Muonionalustaite occurs in cavities of corrosion crust, associated with taenite, goethite, maghemite, amorphous Fe-Ni oxy-hydroxides and soil mineral
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Muonionalustaite, Ni3(OH)4Cl2·4H2O, a new mineral formed by terrestrial weathering of the Muonionalusta iron (IVA) meteorite, Pajala, Norrbotten, Sweden GFF (IF 1.0) Pub Date : 2021-02-02 Dan Holtstam, Luca Bindi, Andreas Karlsson, Johan Söderhielm, Anders Zetterqvist
ABSTRACT Muonionalustaite, ideally Ni3(OH)4Cl2 · 4H2O, is a new mineral species (IMA 2020–010), found as a terrestrial weathering product of the Muonionalusta iron meteorite, in a fragment excavated 1.5 km NE of Lake Kitkiöjärvi in northernmost Sweden. Muonionalustaite occurs in cavities of corrosion crust, associated with taenite, goethite, maghemite, amorphous Fe-Ni oxy-hydroxides and soil mineral
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Stratigraphy of the Gorstian and Ludfordian (upper Silurian) Hemse Group reefs on Gotland, Sweden GFF (IF 1.0) Pub Date : 2021-01-20 Olof Taromi Sandström, Peter Dahlqvist, Mikael Erlström, Lena Persson, Steve Kershaw, Mikael Calner
ABSTRACT The Hemse Group is one of the least understood stratigraphic units of the Silurian sequence of Gotland, Sweden. New results from airborne transient electromagnetic (ATEM) measurements in combination with previously published data from field studies and geophysical investigations shed new light on carbonate platform development during the early- to mid-Ludlow Hemse Group. ATEM reveals a transgressive
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Timing of deformation, metamorphism and leucogranite intrusion in the lower part of the Seve Nappe Complex in central Jämtland, Swedish Caledonides GFF (IF 1.0) Pub Date : 2021-01-13 Yuan Li, David G. Gee, Anna Ladenberger, Håkan Sjöström
ABSTRACT Recent studies in the context of the International Continental Scientific Drilling Project “Collisional Orogeny in the Scandinavian Caledonides” have focused on the importance of the Seve Nappe Complex (SNC) for understanding the subduction history of the Baltoscandian margin during closure of the Iapetus Ocean. In the classical Åre area of western central Jämtland, granulite facies migmatites
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Timing of deformation, metamorphism and leucogranite intrusion in the lower part of the Seve Nappe Complex in central Jämtland, Swedish Caledonides GFF (IF 1.0) Pub Date : 2021-01-13 Yuan Li, David G. Gee, Anna Ladenberger, Håkan Sjöström
ABSTRACT Recent studies in the context of the International Continental Scientific Drilling Project “Collisional Orogeny in the Scandinavian Caledonides” have focused on the importance of the Seve Nappe Complex (SNC) for understanding the subduction history of the Baltoscandian margin during closure of the Iapetus Ocean. In the classical Åre area of western central Jämtland, granulite facies migmatites
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Dapingian to lower Darriwilian (Middle Ordovician) graptolite biostratigraphy and correlation of the Krapperup drill core, Scania, Sweden GFF (IF 1.0) Pub Date : 2021-01-04 Jörg Maletz, Per Ahlberg
ABSTRACT The Dapingian and lower Darriwilian graptolite succession of the Krapperup drill core from Scania, southern Sweden, provides a detailed insight into the axonophoran (biserial) graptolites and their early Palaeozoic evolutionary changes on the Scandinavian platform. Even though earliest Darriwilian axonophorans are not represented, the succession includes faunal elements of the basal Darriwilian
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Meteorite crater re-interpreted as iceberg pit in west-central Sweden GFF (IF 1.0) Pub Date : 2020-12-18 Christian Öhrling, Henrik Mikko, Gustaf Peterson Becher, Carl Regnéll
ABSTRACT This study shows the occurrence of numerous iceberg imprints on the bottom of former ice-dammed lakes in Härjedalen, west-central Sweden. Discussion of the genesis of the so-called “impact crater” known as the Tor structure at Torbygget, which is located in this area, motivated an examination of the area using high-resolution digital elevation models. Previous investigations have suggested
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Correction GFF (IF 1.0) Pub Date : 2020-09-28
(2020). Correction. GFF: Vol. 142, No. 4, pp. iii-iii.
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Dynamics of a retreating ice sheet: a LiDAR study in Värmland, SW Sweden GFF (IF 1.0) Pub Date : 2020-10-01 Alastair Goodship, Helena Alexanderson
ABSTRACT Värmland in south western Sweden lies across the established zone of marine-terrestrial transition of the Scandinavian Ice Sheet (SIS) margin. The region lies inside the Younger Dryas maximum limit reached at 12.7 cal ka BP and the area of rapid final SIS retreat from 11.5 cal ka BP. LiDAR data across Värmland allows more detailed observation and analysis of glacial landforms formed during
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Zircon U–Pb-Hf isotope data in eclogite and metagabbro from southern Sweden reveal a common long-lived evolution and enriched source GFF (IF 1.0) Pub Date : 2020-10-01 Andreas Petersson, Lorraine Tual
ABSTRACT Several orogenies have shaped the bedrock of southern Sweden. While mafic intrusions represent significant sources of information for reconstructing geodynamics and crustal evolution, the characterization of the various generations of such intrusions in Sweden remains limited. We report in situ zircon U–Pb ages and Hf isotope data from a Fe-Ti eclogite and a coronitic metagabbro from the Eastern
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High-resolution event stratigraphy (HiRES) of the Silurian across the Cincinnati Arch (USA) through integrating conodont and carbon isotope biochemostratigraphy, with gamma-ray and sequence stratigraphy GFF (IF 1.0) Pub Date : 2020-10-01 Stephan C. Oborny, Bradley D. Cramer, Carlton E. Brett
ABSTRACT Silurian strata within the tristate area of Indiana, Ohio, and Kentucky have been thoroughly studied for well over a century. Due to rapid facies changes throughout the region numerous lithostratigraphic terminologies were established, many of which were difficult to correlate even over short distances. Recently these stratigraphic complexities have received renewed interest due to advancements