A5046303265- Paleontology and Stratigraphy of Fossils
- Geological Studies and Exploration
- Geology and Paleoclimatology Research
- Marine Biology and Ecology Research
- Geological and Geochemical Analysis
- Hydrocarbon exploration and reservoir analysis
- Geological and Geophysical Studies
- Marine and environmental studies
- Methane Hydrates and Related Phenomena
- Paleontology and Evolutionary Biology
- Geological Formations and Processes Exploration
- Geochemistry and Elemental Analysis
- Pleistocene-Era Hominins and Archaeology
- Cephalopods and Marine Biology
- Geological Modeling and Analysis
- Evolution and Paleontology Studies
- Scientific Research and Discoveries
- Geographic Information Systems Studies
- Maritime and Coastal Archaeology
- Classical Antiquity Studies
- Aquatic Invertebrate Ecology and Behavior
- Ancient and Medieval Archaeology Studies
- Seismic Imaging and Inversion Techniques
- Fossil Insects in Amber
- Geochemistry and Geologic Mapping
UiT The Arctic University of Norway
2014-2023
Novelis (Canada)
2023
Diagnostics for the Real World (United Kingdom)
2022
Uppsala University
1996-2012
Tromsø research foundation
2011-2012
University of California, Riverside
2001
Centre for Palaeogenetics
2001
Institute of Paleontology A A Borisyak
2001
Early Cambrian tommotiids are problematic fossil metazoans with external organophosphatic sclerites that have been considered to be basal members of the lophophorate stem group. Tommotiids almost exclusively known from isolated or rarely fused individual sclerites, which made previous reconstructions actual organism highly conjectural. However, recent discovery first articulated specimens tommotiid Eccentrotheca revealed a tubular sclerite arrangement (scleritome) limited possible life habit...
Two new reflection seismic profiles over the Paleozoic successions of western part Siljan Ring impact structure show a contrasting signature. The more southerly c. 10 km long Mora profile reveals highly disturbed structure, with only few kilometers relatively horizontally layered structures observed. However, interpretations refracted arrivals in data, that can be correlated to reflections, indicate Silurian clastic rocks about 200 m thick central profile. Weak reflections from 600 depth...
New drill cores from the largest known impact structure in Europe, relict of Siljan meteorite crater, provide new possibilities to reconstruct Early Palaeozoic marine environments and ecosystems, document changes sedimentary facies, sea level palaeoclimate Baltoscandia. The crater is an important target project "Concentric Impact Structures Palaeozoic" within framework "Swedish Deep Drilling Program". Two core sections, Mora 001 Solberga 1, have been analysed. successions these sections...
Integration of new isotopic data and earlier biostratigraphic information from eight sections through the terminal Ordovician (Pirgu Porkuni stages) Siljan district, Sweden, allows a more precise correlation in terms biostratigraphy carbon isotope dating. Four levels with positive δ13C excursions are identified (from bottom) – Moe, an unnamed excursion, Paroveja Hirnantian Carbon Isotope Excursion (HICE). The values Boda Limestone 1–2‰ higher than usual Baltica, only for HICE remains within...
We report on new occurrences of the late Ediacaran problematicum Palaeopascichnus (Protista?) from Stáhpogieddi Formation, Arctic Norway. The stratigraphically lowest are in beds transitional between Lillevannet and Indreelva members: highest second cycle Manndrapselva Member, close to Cambrian-type trace fossils. This establishes a long stratigraphical range Digermulen Peninsula, as has been previously documented Newfoundland, South Australia, elsewhere Baltica. age Avalonia Baltica is ∼565...
Abstract New acritarch data from the Kistedalen Formation based on two sections with continuous exposure enable us to establish most detailed Miaolingian biozonation in Baltica date. Six interval zones previously established Gondwana, Eliasum llaniscum , Cristallinium cambriense Adara alea Timofeevia lancarae dubium and Vulcanisphaera turbata zones, are identified, their correlations within Acado‐Baltic Province examined. The diagnoses of Retisphaeridium dichamerum lechistanium emended new...
Abstract The biogeographical distribution of Ordovician and Silurian gastropods, monoplacophorans mimospirids has been analysed on a generic level. dataset contains 334 genera 2769 species, yielding 1231 records with 2274 occurrences worldwide. There is bias towards eastern Laurentia, Baltica Perunica records. Some 53.1% the are Ordovician. study demonstrates that these molluscs well suited to being used improve understanding provinciality. Specific points that: Lower assemblage evident in...
Abstract New information on acritarchs from the Duolbagáisá Formation, Digermulen Peninsula, Arctic Norway, enable recognition of three Cambrian Series 2 acritarch-based zones: Skiagia ornata – Fimbriaglomerella membranacea , Heliosphaeridium dissimilare ciliosa and Volkovia dentifera Liepaina plana Assemblage z ones. Acritarchs Zone (Cambrian Stage 3) appear near base unit, close to an undetermined trilobite. In Upper Member in levels with Kjerulfia n. sp. Elliptocephala sp., appears...
Abstract The Ordovician age Lockne and Devonian Siljan craters are two of the largest impact structures in northern Europe. Both formed targets with a thick, low-strength upper layer. This target configuration is known to generate concentric crater an outer, shallow layer, surrounding central, deeper more resistant substrate. excellent models for studies similar on Earth elsewhere Solar system. Several structural issues remain, drilling through within Swedish Deep Drilling Program intends...
Abstract Eukaryotic multicellularity originated in the Mesoproterozoic Era and evolved multiple times since, yet early multicellular fossils are scarce until terminal Neoproterozoic often restricted to cases of exceptional preservation. Here we describe unusual organically-preserved from mudrocks, that provide support for presence organisms with differentiated cells (potentially an epithelial layer) late Neoproterozoic. Cyathinema digermulense gen. et sp. nov. Nyborg Formation, Vestertana...
New organic-walled microfossil (OWM) assemblages are reported from upper Neoproterozoic glacial and interglacial siliciclastic deposits in Finnmark, northern Norway. A nearly continuous sedimentary succession of the Vestertana Group contains two glaciogenic units, Smalfjorden Mortensnes formations, interpreted as end-Cryogenian Marinoan Ediacaran glaciations, respectively. We investigated OWM record Nyborg, Mortensnes, Stáhpogieddi formations to assess impact a interval on diversity...
Abstract 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 investigated in three Ediacaran–Cambrian sections on the Digermulen Peninsula Arctic Norway, spanning Manndrapselva Member Stáhpogieddi Formation lower member Breidvika Formation. Here, boundary located part upper parasequence (third cycle) Member. Specimens are rare but...
The Hirnantian Glisstjärn Formation (Normalograptus persculptus graptolite Biozone) is a succession of limestones and shales onlapping the Katian Boda Limestone in Siljan District, Sweden. It contains conspicuous, up to several decimeter thick bed densely packed with bipolarly oriented, orthoconic cephalopod conchs that can reach lengths more than 120 cm. Conch fragmentation, bioereosion generally poor preservation indicate time averaging are tentatively interpreted as beached, result...
Abstract Results of in situ U–Pb dating calcite spherulites, cone-in-cone (CIC) and fibres from a calcareous concretion the upper Ediacaran Finnmark, Arctic Norway, are reported. Calcite spherulites innermost layers yielded lower intercept age 563 ± 70 Ma, which, although imprecise, is within uncertainty sedimentation based on fossil assemblages. Non-deformed CIC bottom part an 475 25 which interpreted as formation during period fluid overpressure induced burial sediments. Deformed top 418...
A machaeridian, Lepidocoleus hohensteini sp. nov., is described from the Hunsrück Slate (Lower Emsian) of Germany. The available material includes a unique example preserving evidence soft tissues, only second machaeridian specimen to do so and first lepidocoleid. This shows that plates are attached alternate segments in trunk. morphology consistent with an annelid affinity Lepidocoleidae confirms unity Machaeridia. discovery adds important group known diversity this famous late Palaeozoic...
Eight new specimens and the holotype of Lepidocoleus sarlei Clarke, 1896 from Lagersta¨tten deposits within Rochester Shale (Silurian, Wenlock) New York are described to elucidate morphology, function construction scleritome. The material exhibits an unusual type dorsal hinge with a pronounced antero‐posterior displacement between two sides. Two have aberrant sclerite on right side segment eleven. One tightly enrolled specimen may demonstrate method defence stronger protected oriented...
A new scleritome-bearing organism with eight sclerite types, Trachyplax arctica gen.et sp.nov., is described from the lower Cambrian Paralledal Formation of North Greenland.The originally calcareous sclerites are now silicified; no microstructures preserved.The dominant type (A; maximum dimension 19.3 mm) bilaterally symmetrical, strongly arched, an oval shield showing co-marginal growth lines and a projecting rostrum prominent radial ornamentation.A similar morphology can be identified in...