Jenö Nagy

• Farouk, Sherif; El-Sheikh,, Islam; Jain, Sreepat; Ahmad, Fayez; Elamri, Zaineb & Nagy, Jenø [Show all 8 contributors for this article] (2025). High-resolution Danian-Selandian benthic foraminifera-based paleoenvironmental reconstruction and response to sequence stratigraphy : Inferences from the Elles section, El Kef Basin, Tunisia. Marine Micropaleontology. ISSN 0377-8398. 194. doi: 10.1016/j.marmicro.2024.102433. Full text in Research Archive Show summary

  High-resolution (123 samples) benthic foraminiferal distribution patterns were analyzed for paleoenvironmental reconstruction from a section located at the southern edge of the El Kef Basin (El Haria Formation; Tunisia) spanning the Danian-Selandian interval (planktic foraminifera P1a-P4b zones). Five distinct clusters were identified, each representing different paleoenvironments and depths ranging from inner neritic to upper bathyal, with significant variations in species diversity, paleoproductivity, and bottom water oxygenation. The Dan-C2 hypothermal event is characterized by moderately oxygenated bottom waters, high species diversity, and lowered paleoproductivity within an upper bathyal setting. The LDE is marked by high species diversity, higher paleoproductivity, moderately oxygenated bottom waters, abundance of epifaunal species, and shallowing to middle neritic depths. The Danian-Selandian boundary records (a) a sudden abundance of the inner neritic infaunal species Bulimina strobila, (b) an increase in species diversity, (c) moderately-oxygenated bottom waters, (d) a positive delta 13C excursion, and (e) deepening, from inner to middle neritic settings. Four transgressive- regressive (T-R) cycles based on benthic foraminiferal assemblage-derived bathymetry, P% and the transfer function-based estimate mirror each other, and distinctly mirror paleodepth changes, correlating with global eustatic cycles but also reflecting local tectonic influences.

• Farouk, Sherif; Nagy, Jenø; El-dawoudi,, Iman a; Ahmad, Fayez & Al-kahtany, Khaled (2024). Response of Bathonian–Oxfordian transgressive-regressive cycles on foraminiferal morphogroups, and diversity: a case study from shallow marine deposits in north Gulf of Suez, Egypt. Lethaia: An International Journal of Palaeontology and Stratigraphy. ISSN 0024-1164. 57(3), p. 1–16. doi: 10.18261/let.57.3.6. Full text in Research Archive Show summary

  The analysed samples originate from the commercial well GS 91 drilled in the northern Gulf of Suez, Egypt. It covers a 488-metre-thick Bathonian-Oxfordian section representing the Upper Safa and the Lower Masajid formations. Detailed taxonomic analyses resulted in the identification of 61 foraminiferal species belonging to 34 genera, which are applied to the delineation of Five benthic biozones. Based on test morphologies, nine infaunal and eight epifaunal morphotypes are distinguished to apply in palaeoenvironmental assessments. Lithological and faunal changes observed in the well section allowed the identification of three sea-level cycles. Each cycle includes a transgressive phase dominated by limestone and marl, representing inner shelf carbonate platform facies, and shale to sandstone facies formed during periods of increased palaeowater depth. The first cycle encompasses the upper part of the Safa Formation. Its transgressive phase contains nearly equal amounts of infaunal and epifaunal components indicating oxic conditions, while most of its highstand phase contains almost only epifaunal morphotypes, suggesting an oxygen-depleted condition. In the lower part of the Masajid Formation, two sea-level cycles are distinguished, both containing entirely or dominantly infaunal components indicating normal marine oxygenation. square Benthic foraminifera, carbonate platform, species diversity, morphogroup analysis, sea level cycles

• Nagy, Jenø & Hendrickson, Randi M Støkken (2022). Hyposaline to hypoxic foraminiferal facies and stratigraphy of Middle Jurassic to basal Cretaceous deposits of the Trøndelag Platform, mid-Norwegian shelf. Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 589. doi: 10.1016/j.palaeo.2022.110831. Full text in Research Archive
• Bruhn, Rikke; Nagy, Jenø; Smelror, Morten; Dypvik, Henning; Glimsdal, Sylfest & Pegrum, Richard [Show all 7 contributors for this article] (2022). Shaking and splashing—A case study of far-field effects of the Mjølnir asteroid impact on depositional environments in the Barents Sea. Basin Research. ISSN 0950-091X. doi: 10.1111/bre.12725. Full text in Research Archive Show summary

  The Mjølnir impact crater in the Norwegian Barents Sea features among the 20 largest impact craters listed in the Earth Impact Database. The impact is dated to 142 ± 2.6 Ma, corresponding closely to the Jurassic/Cretaceous boundary in the Boreal stratigraphy. Multidisciplinary studies carried out over the last three decades have suggested that the up to 40 km wide crater was created by a 1–3 km diameter impactor colliding with a shallow epicontinental sea, causing regional havoc and a regional ecological crisis that followed in its wake. Only minor evidence for the consequences of the impact for the surrounding depositional basins has been documented so far. This study describes a large submarine slump penetrated by hydrocarbon exploration well 7121/9-1, located in the southern Hammerfest Basin and approximately 350 km away from the impact site. The slump is dated by a black shale drape, which contains characteristic impact-related biotic assemblages and potential ejecta material. This precise dating enables us to associate the slump with large-scale fault movements and footwall collapse along the basin-bounding Troms-Finnmark Fault Complex, which we conclude were caused by shock waves from the Mjølnir impact and the passage of associated tsunami trains. The draping black shale is interpreted to represent significant reworking of material from the contemporary seabed by tsunamis and currents set up by the impact.

• Hjalmarsdottir, Hanna Rosa; Hammer, Øyvind; Nagy, Jenø & Grundvåg, Sten-Andreas (2021). Foraminiferal stratigraphy and palaeoenvironment of a storm-influenced marine shelf: upper Aptian – lower Albian, Svalbard, Arctic Norway. Cretaceous research (Print). ISSN 0195-6671. 130. doi: 10.1016/j.cretres.2021.105033. Full text in Research Archive Show summary

  This study presents the first record of foraminifera from the Lower Cretaceous Carolinefjellet Formation on the Svalbard archipelago, Arctic Norway. The Svalbard foraminiferal assemblages are dominated by agglutinated forms with a subordinate calcareous component. Several stratigraphically important species are recognised, and four assemblage zones are established: 1) Serovaina loetterlei Zone of middle Aptian or lower, 2) Ammobaculites wenonahae Zone of the middle Aptian, 3) Gaudryina tailleuri Zone of the upper Aptian, 4) Verneuilinoides borealis Zone of the lower Albian. The assemblages exhibit characteristic Boreal features, previously reported from the North Slope of Alaska, Arctic Canada, Western Siberia, and older Mesozoic strata in Svalbard. The study therefore allows for Circum-Arctic correlations and the extensions of stratigraphic ranges of several Boreal species. The investigated succession exhibits a large-scale fining-upwards trend. The lower part (the Dalkjegla Member) is characterised by abundant hummocky cross-stratified and wave-ripple cross-laminated sandstone beds, indicating deposition on a storm-dominated shelf. The upper part (the Innkjegla Member) is dominated by mudstones containing strata-bound siderite concretions and carbonate-cemented sandstone beds, suggesting deposition under more quiescent, middle to outer shelf conditions. An upwards increase in trace fossil diversity and degree of bioturbation, in concert with expanding foraminiferal diversity and morphogroup variability, reflects a long-term deepening of the shelf with fluctuating oxygen conditions. In combination with XRF data, diversity statistics, and morphogroup application, the present study thus sheds a new light on higher frequency palaeoenvironmental changes in upper part of the Carolinefjellet Formation

• Bujtor, László & Nagy, Jenø (2021). Fauna, palaeoecology and ecotypes of the Early Cretaceous sediment hosted hydrothermal vent environment of Zengővárkony (Mecsek Mountains, Hungary). Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 564. doi: 10.1016/j.palaeo.2020.110179. Full text in Research Archive Show summary

  The fossil biota of the upper Valanginian–lower Hauterivian sediment hosted vent (SHV) environment of Zengővárkony comprises 39 species, 55 genera and higher taxa representing seven phyla. Thirteen of these taxa are reported from Zengőrvárkony as new species or new subgenera/genera, and this high endemicity is linked to a unique palaeoenvironment. The palaeoenvironment is developed in an outer shelf epicontinental setting on an elevated block or slope, and is linked to a small sedimentary iron-ore body interbedded with pillow lavas being a result of ferriferous exhalations and biogenic processes. Biogeographically, the brachiopods indicate the Sub-Tethyan domain. Serial sectioning of brachiopods revealed a taxon-dependent rich and diverse microfauna (sponges, foraminifers, gastropods) preserved inside the shells. Internally preserved microfauna in brachiopods reveals differentiation among preventive strategies. It implies different preventive efficiencies of alternative defence strategies of higher brachiopod taxa. The unique Zengővárkony SHV environment attracted both nektonic and benthic organisms by creating different ecotopes around the hydrothermally driven bottom environment. This environment belongs to the group of rare, shelfal, hydrothermally influenced palaeoenvironments formed on continental crust. Water depth was most probably between 100 and 150 m. Recent observations from a similar modern volcanic built-up, and its effects on the marine environment located on continental crust around the Aeolian Islands (Tyrrhenian Sea) support the recognition of this fossil SHV environment and helps to understand better its bathymetry, ecological conditions and ore-formation.

• Nagy, Jenø & Naoroz, Mufak Said (2018). Changing depositional environments reflected by foraminifera in a transgressive-regressive sequence of the Lower Cretaceous on Spitsbergen. Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 511, p. 144–167. doi: 10.1016/j.palaeo.2018.07.026. Full text in Research Archive
• Hjalmarsdottir, Hanna Rosa; Nakrem, Hans Arne & Nagy, Jenø (2018). Environmental significance and taxonomy of well preserved foraminifera from Upper Jurassic – Lower Cretaceous hydrocarbon seep carbonates, central Spitsbergen. Micropaleontology. ISSN 0026-2803. 64(5-6), p. 435–480. Full text in Research Archive Show summary

  Five hydrocarbon seep carbonate structures in the upper part of the Slottsmøya Member (Agardhfjellet Formation) in central Spitsbergen have been sampled and processed for foraminifera. The carbonates have been found to contain excellently preserved agglutinated assemblages, in contrast to the diagenetically deformed assemblages in the adjacent shales. In total 15 genera and 35 agglutinated species are recognised in the palaeoseeps. The pristine condition of the foraminiferal tests allows for detailedmorphological documentation of 21 species, ofwhich the following six are proposed as new: Reophax pyriloculus n. sp., Haplophragmoides perlobatus n. sp., Labrospira lenticulata n. sp., Ammobaculites deflectus n. sp., Ammobaculites knorringensis n. sp. and Textularia pernana n. sp.. Depositional environment of the carbonate palaeoseeps is interpreted to be similar to that of a normalmarine shelf, as opposed to the previously documented restricted (hypoxic) environment of the adjacent shales. Morphogroup analysis of assemblages in the palaeoseeps reveals that over 89% of genera in the seep carbonate bodies are categorised as surficial/shallow infaunal to deep infaunal. The same morphogroup component in the shale succession onlymakes up 31.5% of the total genera. Agradual shift can be seen in the shale assemblages from almost exclusively epifaunalmorphogroups in the lower part to a dominating surficial to infaunal component in the samples closest to the palaeoseep stratigraphic levels, which translates to an upwards decreasing oxygen level trend. The foraminifera date the palaeoseeps as late Volgian – late Ryazanian, and the ages for each seep structure are constrained by previously reported associated ammonite occurrences. Some species of foraminifera occurring in the palaeoseeps are possible candidates for extended stratigraphic ranges.

• Hess, Silvia & Nagy, Jenø (2017). New foraminiferal species from the Kapp Toscana Group (Carnian to Bathonian) of central Spitsbergen. In Kaminski, M.A. & Alegret, L. (Ed.), Proceedings of the Ninth International Workshop on Agglutinated Foraminifera. Grzybowski Foundation. ISSN 9788394195618. p. 65–73. doi: 10.2307/1486047. Full text in Research Archive
• Nagy, Jenø; Tovar, Francisco J Rodríguez & Reolid, Matias (2016). Environmental significance of Ophiomorpha in a transgressive-regressive sequence of the Spitsbergen paleocene :. Polar Research. ISSN 0800-0395. 35. doi: 10.3402/polar.v35.24192. Full text in Research Archive Show summary

  The study focuses on occurrences of Ophiomorpha burrows in a transgressive–regressive succession composing the Early Paleocene Firkanten Formation deposited in paralic, prodelta to delta front conditions in the Central Basin of Spitsbergen. The burrows colonize sandstones of the Todalen Member at four sites and belong to two ichnospecies: Ophiomorpha cf. nodosa, forming dominantly vertical shafts; and O. cf. irregulaire, consisting of horizontal sinuous tunnels ending in subconical shafts. Both species are observed in shoreface sandstones deposited as a barrier bar. Lithological features and stratigraphic positions suggest that the trace-makers preferentially colonized high-energy sand environments. Foraminiferal faunas occurring below and above the barrier sandstones indicate brackish water conditions for the Ophiomorpha levels, which accordingly are of restricted, monospecific nature. It is inferred that the trace-makers had a dominantly suspension feeding habit as a modern analogue Calianassa major. Portrayed in a sequence stratigraphic framework, the Ophiomorpha-bearing sandstones in middle reaches of the Central Basin were deposited in the final stage of the transgressive systems tract, which drowned the underlying coal-bearing paralic facies. Moreover, in the northern, coal-rich parts of the basin, occurrence of Ophiomorpha signals marine ingression into the paralic system.

• Nagy, Jenø (2016). A sequence stratigraphic model of benthic foraminiferal facies trends with Triassic and Jurassic examples. Marine Micropaleontology. ISSN 0377-8398. 122, p. 99–114. doi: 10.1016/j.marmicro.2015.12.003. Full text in Research Archive Show summary

  Foraminiferal facies trends are outlined in a new sequence stratigraphic model embracing depositional conditions from alluvial plain to offshore shelf settings. The biofacies proxies include distribution of benthic species, faunal diversities and frequency of normal marine (contra restricted) taxa. In the transgressive–regressive framework, biofacies trends are portrayed as assemblage expansion and reduction separated by trend changes. Assemblage expansion means upward increase in diversity and frequency of normal marine taxa, while assemblage reduction means upward decrease of the same proxies. The model is based on two modern bathymetric profiles and five Mesozoic sections, the latter documenting three settings in a transgressive–regressive sequence: 1) A deeper basinal setting, with hypoxia at maximum flooding, shows a trend change from assemblage expansion to reduction in the transgressive systems tract, marking a shift from the restricting effect of shallow water to that of hypoxia. The maximum flooding reveals a change from assemblage reduction to expansion. 2) An intermediate basinal setting with normal shelf conditions at maximum flooding is typified by continuous assemblage expansion in the transgressive systems tract, while the maximum flooding shows a change from expansion to reduction. 3) At a basin marginal position the maximum transgression is marked by extremely low diversities and relatively homogeneous assemblages. The study demonstrates that changing foraminiferal facies trends signify depositional conditions reflecting arrangement of sequence components such as flooding events, systems tracts and boundaries. Assemblage trend changes are discrete stratigraphic horizons signalling shifts in the effect of environmental factors (water depth, salinity, oxygenation) in the sequence architecture.

• Mueller, Steven; Veld, Harry; Nagy, Jenø & Kürschner, Wolfram Michael (2014). Depositional history of the upper triassic kapp toscana group on svalbard, Norway, inferred from palynofacies analysis and organic geochemistry. Sedimentary Geology. ISSN 0037-0738. 310, p. 16–29. doi: 10.1016/j.sedgeo.2014.06.003. Full text in Research Archive
• Hess, Silvia; Nagy, Jenø & Laursen, Gitte Vestergaard (2014). Benthic foraminifera from the lower jurassic transgressive mudstones of the south-western barents sea-a possible high-latitude expression of the global Pliensbachian-Toarcian turnover? Polar Research. ISSN 0800-0395. 33:20206. doi: 10.3402/polar.v33.20206. Full text in Research Archive
• Rodríguez-Tovar, Francisco J.; Nagy, Jenø & Reolid, Matias (2014). Palaeoenvironment of Eocene prodelta in Spitsbergen recorded by the trace fossil Phycosiphon incertum. Polar Research. ISSN 0800-0395. 33:23786(2014). doi: 10.3402/polar.v33.23786. Full text in Research Archive
• Nagy, Jenø (2013). Sequence stratigraphic application of foraminiferal facies patterns: Triassic and Jurassic examples. In Nakrem, Hans Arne & haukdal, gunn (Ed.), NGF Vinterkonferansen 2013. Oslo, 8-20. January, 2013. NGF Abstracts and Proceedings of the Geological Society of Norway 1 (2013). Norsk Geologisk Forening. ISSN 9788292394786. p. 93–93. doi: 10.1016/j.marmicro.2015.12.003. Full text in Research Archive
• Nagy, Jenø; Jargvoll, David; Dypvik, Henning; Jochmann, Malte & Riber, Lars (2013). Environmental changes during the Paleocene-Eocene Thermal Maximum in Spitsbergen as reflected by benthic foraminifera. Polar Research. ISSN 0800-0395. 32. doi: 10.3402/polar.v32i0.19737. Full text in Research Archive
• Reolid, Matias; Rodríguez-Tovar, Francisco J. & Nagy, Jenø (2012). Ecological replacement of Valanginian agglutinated foraminifera during a maximum flooding event in the Boreal realm (Spitsbergen). Cretaceous research (Print). ISSN 0195-6671. 33(1), p. 196–204. doi: 10.1016/j.cretres.2011.10.003. Full text in Research Archive
• Hjalmarsdottir, Hanna Rosa; Nakrem, Hans Arne & Nagy, Jenø (2012). Foraminifera from Late Jurassic - Early Cretaceous hydrocarbon seep carbonates, central Spitsbergen, Svalbard - preliminary results. Norsk Geologisk Tidsskrift. ISSN 0029-196X. 92(2-3), p. 157–165. Full text in Research Archive Show summary

  Mixed calcareous-agglutinated benthic foraminiferal assemblages have been obtained from five hydrocarbon seep carbonate structures in the upper Slottsmøya Member (Agardhfjellet Formation) in central Spitsbergen, Svalbard. The composition of the agglutinated component is comparable to faunas previously described from the surrounding dark shales of the Slottsmøya Member, as well as from deposits of Arctic Russia and other areas of the Boreal Realm. Calcareous foraminifera are observed only in thin-sections. The foraminifera date the hydrocarbon seep bodies as Late Volgian – Late Ryazanian; an age determination in part slightly divergent from ammonite datings previously recorded from these carbonates. This is the first systematic report of foraminifera from seep structures developed at the Jurassic-Cretaceous transition.

• Nagy, Jenø & Murray, John W. (2011). Paralic foraminiferal assemblages from the Paleocene Firkanten Formation of Spitsbergen. Foraminiferal assemblages and paleoenvironmental interpretation of the Cretaceous Carolinefjellet Formation, Spitsbergen. ISSN 1400-3821. p. 137–150. Full text in Research Archive
• Nagy, Jenø; Hess, Silvia; Dypvik, Henning & Bjærke, Tor (2011). Marine shelf to paralic biofacies of Upper Triassic to Lower Jurassic deposits in Spitsbergen. Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 300(1-4), p. 138–151. doi: 10.1016/j.palaeo.2010.12.018. Full text in Research Archive
• Nagy, Jenø & Murray, John W. (2011). Paralic foramimiferal assemblages from the Paleocene Firkanten Formation of Spitsbergen. In Kaminski, M.A. & Filipescu, Sorin (Ed.), Proceedings of the Eight International Workshop on Agglutinated Foraminifera, Cluj-Napoca, Romania, September 7-13, 2008. Grzybowski Foundation. ISSN 9789735952600. p. 137–149. Full text in Research Archive
• Silye, L; Nagy, Jenø & Filipescu, Sorin (2011). Ammodiscus aff. Gullmarensis in the Sarmatian (Middle Miocene) of the Transylvanian Basin, Romania. In Kaminski, M.A. & Filipescu, Sorin (Ed.), Proceedings of the Eight International Workshop on Agglutinated Foraminifera, Cluj-Napoca, Romania, September 7-13, 2008. Grzybowski Foundation. ISSN 9789735952600. p. 311–315. Full text in Research Archive
• Dypvik, Henning; Riber, Lars; Burca, Florin; Ruther, Denise Christina; Jargvoll, David & Nagy, Jenø [Show all 7 contributors for this article] (2011). The Paleocene-Eocene thermal maximum (PETM) in Svalbard - clay mineral and geochemical signals. Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 302(3-4), p. 156–169. doi: 10.1016/j.palaeo.2010.12.025. Full text in Research Archive
• Reolid, Matias; Nagy, Jenø & Rodriguez-Toyar, FJ (2010). Ecostratigraphic trends of Jurassic agglutinated foraminiferal assemblages as a response to sea-level changes in shelf deposits of Svalbard (Norway). Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 293(1-2), p. 184–196. doi: 10.1016/j.palaeo.2010.05.019. Full text in Research Archive
• Nagy, Jenø & Bjørlykke, Knut (2010). Stratigraphy. In Bjørlykke, Knut (Eds.), Petroleum Geoscience: From Sedimentary Environments to rock Physics. Springer Science+Business Media B.V.. ISSN 9783642023316. p. 213–234. Full text in Research Archive
• Reolid, Matias; Philippe, Marc; Nagy, Jenø & Abad, Isabel (2010). Preservation of phosphatic wood remains in marine deposits of the Brentskardhaugen Bed (Middle Jurassic) from Svalbard (Boreal Realm). Facies. ISSN 0172-9179. 56(4), p. 549–566. doi: 10.1007/s10347-010-0219-z. Full text in Research Archive
• Nagy, Jenø; Hess, Silvia & Alve, Elisabeth (2010). Environmental significance of foraminiferal assemblages dominated by small-sized Ammodiscus and Trochammina in Triassic and Jurassic delta-influenced deposits. Earth-Science Reviews. ISSN 0012-8252. 99(1-2), p. 31–49. doi: 10.1016/j.earscirev.2010.02.002. Full text in Research Archive
• Nagy, Jenø; Reolid, Matias & Rodriguez-Tovar, F.J. (2009). Foraminiferal morphogroups in dysoxic shelf deposits from the Jurassic of Spitsbergen. Polar Research. ISSN 0800-0395. 28(2), p. 214–221. doi: 10.1111/j.1751-8369.2009.00112.x. Full text in Research Archive
• Reolid, Matias; Nagy, Jenø; Rodriguez-Tovar, F.J. & Oloriz, F. (2008). Foraminiferal assemblages as palaeoenvironmental bioindicators in Late Jurassic epicontinental platforms: Relation with trophic conditions. Acta Palaeontologica Polonica. ISSN 0567-7920. 53(4), p. 705-722–705-722. Full text in Research Archive
• Nagy, Jenø & Berge, S.H. (2008). Micropalaeontological evidence of brackish water conditions during deposition of the Knorringfjellet Formation, Late Triassic-Early Jurassic, Spitsbergen. Polar Research. ISSN 0800-0395. 27(3), p. 413–427. doi: 10.1111/j.1751-8369.2007.00038.x. Full text in Research Archive
• Reolid, Matias & Nagy, Jenø (2008). Jurassic transgressive-regressive cycles in carbonate and siliciclastic shelf facies: different response of foraminiferal assemblage trends to sea-level changes. In Kaminski, M.A. & Coccioni, Rodolfo (Ed.), Proceedings of the Seventh International Workshop on Agglutinated Foraminifera (Urbino, Italy, October 2-8, 2005). The Grzybowski Foundation. ISSN 9788392486930. p. 199–223. Full text in Research Archive
• Reolid, Matias; Rodriguez-Tovar, F.J.; Nagy, Jenø & Oloriz, F. (2008). Benthic foraminiferal morphogroups of mid to outer shelf environments of the Late Jurassic (Prebetic Zone, southern Spain): Characterization of biofacies and environmental significance. Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 261(3-4), p. 280–299. doi: 10.1016/j.palaeo.2008.01.021. Full text in Research Archive
• Midtkandal, Ivar; Nystuen, Johan Petter & Nagy, Jenø (2007). Paralic sedimentation on an epicontinental ramp shelf during a full cycle of relative sea-level fluctuation; the Helvetiafjellet Formation in Nordenskiold Land, Spitsbergen. Norsk Geologisk Tidsskrift. ISSN 0029-196X. 87, p. 343–359. Full text in Research Archive
• Nagy, Jenø (2005). Delta-influenced foraminiferal facies and sequence stratigraphy of Paleocene deposits in Spitsbergen. Palaeogeography, Palaeoclimatology, Palaeoecology. ISSN 0031-0182. 222, p. 161–179. Full text in Research Archive
• Dypvik, Henning; Mørk, Atle; Smelror, Morten; Sandbakken, Pål; Tsikalas, Filippos & Vigran, Jorun os [Show all 12 contributors for this article] (2004). Impact breccia and ejecta from the Mjølnir crater in the Barents Sea - The Rangnarok Formation and Sindre Bed. Norsk Geologisk Tidsskrift. ISSN 0029-196X. 84, p. 143–167. Full text in Research Archive
• Bremer, Gerd Merethe A.; Smelror, Morten; Nagy, Jenø & Vigran, Jorunn Os (2004). Biotic Responses to the Mljønir Meteorite Impact, Barents Sea: Evidence from a Core Drilled within the Crater, Cratering in Marine Environments and on Ice. Springer. ISSN 9783540406686. p. 21–38. Full text in Research Archive
• Smelror, Morten; Kelly, Simon R.A.; Dypvik, Henning; Mørk, Atle; Nagy, Jenø & Tsikalas, Filippos (2001). Mjølnir (Barents Sea) meteorite impact ejecta offers a Volgian-Ryazanian boundary marker. Newsletters on stratigraphy. ISSN 0078-0421. 38(2/3), p. 129–140. Full text in Research Archive
• Nagy, Jenø & Basov, V. (1999). Revised foraminiferal stratigraphy of Bathonian to Ryazanian deposits in Spitsbergen. Micropaleontology. ISSN 0026-2803. 44, p. 217–255. Full text in Research Archive

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• Nagy, Jenø & Hendrickson, Randi M Støkken (2019). Stratigraphy of Middle Jurassic to basal Cretaceous foraminiferal facies reflecting hyposaline and hypoxic waters on the mid-Norwegian shelf. Full text in Research Archive
• Planke, Sverre; Zuchuat, Valentin; Svensen, Henrik; Hammer, Øyvind; Braathen, Alvar & Silkoset, Petter [Show all 27 contributors for this article] (2016). Coring and High-Resolution Imaging of the Permian-Triassic Boundary in Deltadalen, Svalbard. Full text in Research Archive
• Planke, Sverre; Twitchett, Richard; Zuchuat, Valentin; Svensen, Henrik; Hammer, Øyvind & Braathen, Alvar [Show all 22 contributors for this article] (2015). Coring the Permian-Triassic Boundary in Deltadalen, Svalbard. Full text in Research Archive
• Rismyhr, Bjarte; Olaussen, Snorre; Bjærke, Tor & Nagy, Jenø (2015). Facies characteristics, stratigraphic architecture and sequence stratigraphy of the Upper Triassic-Middle Jurassic Wilhelmøya Subgroup on eastern Spitsbergen - A possible analogue for the Realgrunnen Subgroup along platform margins and internal basin highs in the Barents Sea. Full text in Research Archive
• Nagy, Jenø & Hendrichson, R.M. (2014). Middle Jurassic to basal Cretaceous foraminifral stratigraphy and water mass features on the Mid-Norwegian shelf. Full text in Research Archive
• Nakrem, Hans Arne; Hammer, Øyvind; Hryniewicz, Krzysztof; Rousseau, Julie; Nagy, Jenø & Hjálmarsdóttir, Hanna Rosa [Show all 9 contributors for this article] (2013). Micro and macro-fauna in the Jurassic-Cretaceous Slottsmøya Mbr. (Agardhfjellet Fm.), Central Spitsbergen. In Nakrem, Hans Arne & haukdal, gunn (Ed.), NGF Vinterkonferansen 2013. Oslo, 8-20. January, 2013. NGF Abstracts and Proceedings of the Geological Society of Norway 1 (2013). Norsk Geologisk Forening. ISSN 9788292394786. p. 93–94. Full text in Research Archive
• Hess, Silvia; Nagy, Jenø & Laursen, G.V. (2013). Benthic foraminiferal assemblages in Early Jurassic deposits of the south-western Barents Sea. In Nakrem, Hans Arne & haukdal, gunn (Ed.), NGF Vinterkonferansen 2013. Oslo, 8-20. January, 2013. NGF Abstracts and Proceedings of the Geological Society of Norway 1 (2013). Norsk Geologisk Forening. ISSN 9788292394786. p. 58–58. Full text in Research Archive
• Nagy, Jenø (2013). A sequence stratigraphic model for foraminiferal facies patterns Applied on Triassic and Jurassic sections mainly from Spitsbergen. Full text in Research Archive
• Nagy, Jenø (2012). Sequence stratigraphic Application of foraminiferal facies patterns: Triassic and Jurassic examples. Grzybowski Foundation Special Publication. 18, p. 66–67. Full text in Research Archive
• Nagy, Jenø (2011). Biotic responses to the Paleocene-Eocene thermal maximum in Spitsbergen. Full text in Research Archive
• Reolid, Matias; Nagy, Jenø & Philippe, Marc (2010). Taphonomy of phosphatic wood remains in marine deposits of the Middle Jurassic (Brentskardhaugen Bed) of Spitsbergen. Full text in Research Archive
• Reolid, Matias; Nagy, Jenø & Rodriguez-Tovar, F.J. (2010). Foraminiferalassemblages and oxygen restricted biofacies of Jurassic shelf deposits (Svalbard): ecostratigraphy and sea-level changes. Full text in Research Archive
• Nagy, Jenø; Hess, Silvia & Alve, Elisabeth (2010). Facies assessments of paralic deposits based on foraminifera: Triassic-Jurassic of the northwest European margin. Full text in Research Archive
• Hess, Silvia & Nagy, Jenø (2010). Environmental significance of foraminiferal facies combined with sedimentary data in Late Triassic to Middle Jurassic formations of Spitsbergen. Full text in Research Archive
• Nagy, Jenø (2010). The Paleogene foraminiferal succession of Svalbard on the margin of a brackish Arctic Ocean. Full text in Research Archive
• Nagy, Jenø (2010). Foraminiferal responses to the Paleocene-Eocene Thermal Maximum in Spitsbergen. Full text in Research Archive
• Dypvik, Henning; Riber, Lars; Burca, Florin; Ruther, Denise; Jargvoll, David & Nagy, Jenø (2010). Hypoxia developed at the Paleocene-Eocene thermal maximum in Svalbard, Norway. Full text in Research Archive
• Hess, Silvia; Nagy, Jenø; Dypvik, Henning & Bjærke, Tor (2010). Paralic biofacies and stratigraphy of Late Triassic to Middle Jurassic deposits of the Barents Sea region. Full text in Research Archive
• Nagy, Jenø; Dypvik, Henning; Jargvoll, David & Riber, Lars (2010). Features of a semi-isolated Arctic Ocean and the Paleocene-Eocene Thermal Maximum (PETM)reflected in the Paleogene foraminiferal facies of Spitsbergen. Full text in Research Archive
• Dypvik, Henning; Riber, Lars; Burca, Florin; Ruther, Denise; Jargvoll, David & Nagy, Jenø (2010). Mineralogical shifts at the paleocene-Eocene thermal maximum (PETM) event, Svalbard. Full text in Research Archive
• Nagy, Jenø (2008). Agglutinated foraminiferal assemblages of the Paleogene of Spitsbergen: responses to a semi-isolated Arctic Ocean. Grzybowski Foundation Special Publication. 14, p. 37–37. Full text in Research Archive
• Hess, Silvia & Nagy, Jenø (2008). Foraminiferal assemblages of Upper Triassic to Middle Jurassic offshore shelf to marginal marine deposits of the Barents Sea area. Grzybowski Foundation Special Publication. 14, p. 20–21. Full text in Research Archive
• Ruther, Denise; Burca, Florin; Nagy, Jenø & Dypvik, Henning (2008). The Palaeogene depositional environments of Frysjaodden to Hollendardalen formations, Svalbard. Full text in Research Archive
• Silye, L & Nagy, Jenø (2008). Agglutinated foraminifera from the Middle Miocene (Sarmatian) of the Transylvanian Basin, Romania. Grzybowski Foundation Special Publication. 14, p. 56–56. Full text in Research Archive
• Reolid, Matias; Nagy, Jenø & Hess, Silvia (2008). Agglutinated foraminiferal morphogroups in dysoxic shelf deposits from the Jurassic of Spitsbergen. Grzybowski Foundation Special Publication. 14, p. 50–50. Full text in Research Archive
• Nagy, Jenø (2008). Paleogene foraminiferal facies of Spitsbergen reflecting features of semiisolated Arctic ocean: results of the WUN PACE initiative. Full text in Research Archive
• Hess, Silvia & Nagy, Jenø (2008). Micropaleontological evidence of changing paralic environments in Mesozoic deposits of the Barents Sea area. Full text in Research Archive
• Hess, Silvia; Nagy, Jenø & Bjærke, T. (2008). Environmental significance of foraminiferal facies in Mesozoic deposits (Late Triassic to Middle Jurassic) of Spitsbergen. Full text in Research Archive
• Reolid, Matias; Nagy, Jenø & Hess, Silvia (2008). Foraminiferal morphogroups and sea-level changes in Jurassic shelf deposits of Svalbard (Artic Realm). Full text in Research Archive
• Hess, Silvia & Nagy, Jenø (2007). Environmental significance of foraminiferal facies combined with sedimentary data in Late Triassic to Middle Jurassic formations of Spitsbergen. Full text in Research Archive
• Hess, Silvia & Nagy, Jenø (2007). Presentation of the project - Paralic biofacies and stratigraphy of Late Triassic to Middle Jurassic deposits of the Barents Sea region. Full text in Research Archive
• Nagy, Jenø; Berge, S.H. & Hess, Silvia (2007). Foraminiferal facies suggests brackish water conditions during deposition of the Knorringfjellet Formation; Late Triassic - Early Jurassic of Spitsbergen. Full text in Research Archive
• Reolid, Matias; Nagy, Jenø & Rodriguez-Tovar, F.J. (2007). Agglutinated foraminiferal morphogroups in Jurassic shelf deposits from Spitsbergen. Full text in Research Archive
• Reolid, Matias & Nagy, Jenø (2005). Jurassic transgressive-regressive cycles in carbonate and siliciclastic shelf facies: comparison of foraminiferal aasemblades. Full text in Research Archive
• Nagy, Jenø; Randi, Hendrickson & Grønseth, Ole (2005). Foraminiferal stratigraphy and facies of Middle Jurassic to lowermost Cretaceous deposits of the Mid-Norwegian Shelf. Full text in Research Archive
• Grøseth, Ole; Nagy, Jenø & Karlsen, Dag (2005). Organic geochemistry and foraminiferal facies of the Jurassic (Alenian - Kimmeridgian) of the Mid-Norwegian shelf. Full text in Research Archive
• Dypvik, Henning; Mørk, Atle; Smelror, Morten; Tsikalas, Filippos; Sandbakken, Pål T. & Bremer, G.M.A. [Show all 8 contributors for this article] (2004). The Mjølnir impact crater. Full text in Research Archive
• Dypvik, Henning; Smelror, Morten; Mørk, Atle; Gabrielsen, Roy Helge; Sandbakken, Pål T. & Nagy, Jenø [Show all 9 contributors for this article] (2003). Mjølnirkrateret i Barentshavet – en hilsen fra verdensrommet. Gråsteinen : et geofaglig tidsskrift for alle. ISSN 0807-4801. 8. Full text in Research Archive
• Bremer, G.M.A.; Smelror, Morten & Nagy, Jenø (2003). Biotic responses to the Mjølnir meteorite impact in the Barents Sea. Full text in Research Archive
• Bremer, Gerd M Andersen; Nagy, Jenø & Dypvik, Henning (2001). Foraminiferal stratigraphy at the Jurassic-Cretaceous transition reflecting the Mjølnir meteor impact (Barnets Sea). Full text in Research Archive Show summary

  Foraminiferal assemblages in core samples have been studied from two cores (7430/10-U-01 and 7329/03-U-01) drilled on the southern Barents Shelf. Core 7329/03-U-01 is taken on the central high of the Mjølnir impact crater, while 7430/10-U-01 is located about 30 km northeast of the same crater. According to earlier publications (Gudlaugsson 1993; Dypvik et al. 1996; Tsikalas et al. 1998), the crater is formed by a bolide impact close to the Jurassic-Cretaceous boundary. The lower part of core 7329/03-U-01 consists of strongly deformed sandstones and shales. The deformation is attributed to the impact. The foraminiferal assemblages and lithologies of this interval show similarities with the Wilhelmøya Subgroup (Norian to Toarcian) in Spitsbergen. The upper part of the impact-affected unit is interpreted as suspension deposits, and contains impoverished faunas and also these are similar to those of the Wilhelmøya Subgroup. The upper, unaffected part of the core contains almost exclusively calcareous foraminifera and are typical for the Ryazanian to probably Valanginian interval. These faunas are dominted by epifaunal and partly epiphytic morphotypes. In core 7430/10-U-01 the impact is marked by a mudflake conglomerate associated with other impact indicators such as shocked quartz and Ir-anomaly. The interval (ca. 1 m) above these indicators is barren of foraminifera or contains very few, probably redeposited specimens. Rich Ryazanian to probably Valanginian calcareous faunas occur above this interval.

• Bremer, Gerd M Andersen; Nagy, Jenø & Dypvik, Henning (2001). Foraminiferal stratigraphy at the Jurassic/Cretaceous transition reflecting the Mjølnir impact (Barents Sea). Full text in Research Archive Show summary

  Foraminiferal assemblages in core samples have been studied from two cores (7430/10-U-01 and 7329/03-U-01) drilled on the southern Barents Shelf. Core 7329/03-U-01 is taken on the central high of the Mjølnir crater, while 7430/10-U-01 is located about 30 km northeast of the same Mjølnir structure. According to earlier publications, the crater is formed by a bolide impact at the Jurassic/Cretaceous boundary. The lower part of core 7329/03-U-01 consists of strongly deformed sandstones and shales. The deformation is attributed to the impact. The foraminiferal assemblages in this interval show similarities with the Wilhelmøya Subgroup in Spitsbergen (Norian to Toarcian in age). The upper part of the impact-affected unit is interpreted as suspension deposits and contains impoverished faunas similar to those of the Wilhelmøya Subgroup. The upper, unaffected part of the core contains typical Ryazanian to probably Valanginian faunas. In core 7430/10-U-01 the impact is marked by a mudflake conglomerate associated with other impact indicators as shocked quartz and Ir-anomaly. The interval (ca. 1 m) above these indicators is barren for foraminifera or contains very few, probably redeposited specimens. Rich Ryazanian to probably Valanginian faunas occur above this interval. In both cores the unaffected intervals consist mainly of organic rich shales.

• Bremer, Gerd M Andersen; Dypvik, Henning; Smelror, Morten & Nagy, Jenø (2001). Biotic responses to the marine Mjølnir meteorie impact (Volgian-Ryazanian boundary, Barents Sea). Full text in Research Archive Show summary

  The Mjølnir impact in the central Barents Sea (Dypvik et al. 1996) is one of very few occurrences allowing detailed studies on both pre- and post-impact sediments and marine biotas. Preliminary studies from, both within and outside the impact structure give no indications of any significant biotic extinctions related the Mjølnir impact. Low diversity invertebrate faunas with ammonites and bivalves (mainly Buchia), and low diversity foraminiferal assemblages (mainly agglutinated species) typically occur both below and above the impact influenced strata (Bremer et al. 2001, Smelror et al. 2001). There also seem to be no major extinction or changes in diversity of the marine microfloras related to the impact event. This is in accordance with Jansa (1993)'s lower limit bolide size for extinction The overall composition of the microfossil assemblages show, however, a significant turnover within the impact-influenced strata. Prolific blooms of marine prasinophycean algae, indicating ocean eutrophication, are noted in the oldest post impact crater deposits (core 7329/03-U-01), in ejecta-bearing strata 30 km outside the impact structure (core 7430/10-U-01) and in the Volgian-Ryazanian boundary beds on Svalbard and off northern Norway (Smelror et al., in press). These blooms probably were induced by the large amounts of nutrients released in the water-column by the impact, subsequent collapse of the crater, and the released tsunamis.

• Bremer, Gerd M Andersen; Nagy, Jenø & Dypvik, Henning (2001). Searching the foraminiferal succession for responses to the Mjølnir meteorite impact. Full text in Research Archive Show summary

  Foraminiferal assemblages have been studied in core samples from two IKU deep boreholes (7430/10-U-01 and 7329/03-U-01) drilled on the southern Barents Shelf. 7329/03-U-01 is from the central high of the Mjølnir impact crater, while 7430/10-U-01 is located about 30 km northeast of the crater. Earlier publications (Gudlaugsson 1993; Dypvik et al. 1996; Tsikalas et al. 1998; Smelror et al. 2001), identified the crater as a bolide impact close to the Jurassic-Cretaceous boundary. The core from 7329/03-U-01 is divided into several depositional intervals of which the lower, and major, one is comprised of strongly deformed sandstones and shales. This deformation has been attributed to the impact. The succeeding and much thinner interval has been interpreted as impact suspension deposits. The impoverished foraminiferal assemblages and the lithologies of both these intervals show similarities with the Wilhelmøya Subgroup (Norian to Toarcian) in Spitsbergen. The upper, unaffected part of the core contains almost exclusively calcareous foraminifera, typical for the Ryazanian to Valanginian interval. These faunas are dominated by epifaunal and partly epiphytic morphotypes. In the 7430/10-U-01 core, the impact is marked by a mudflake conglomerate associated with other indicators such as shocked quartz and Ir-anomaly. The interval (ca. 1 m) immediately above these indicators is barren of foraminifera or contains only very few, probably redeposited specimens.

• Solheim, Anders; Forsberg, Carl F.; Elverhøi, Anders; Eidvin, Tor; Nagy, Jenø & Smelror, Morten (1997). Glacial evolution of the Svalbard margin; an update based on results from Site 986, ODP Leg 162. Full text in Research Archive
• Nagy, Jenø (2007). Depositional environments and stratigraphy. (Til bruk i undervisning i GEO 4220). Unipub forlag. Full text in Research Archive
• Alve, Elisabeth; Husum, Katrine; Vestergard, L.G.; Murray, John W. & Nagy, Jenø (2007). Palaeoenvironmental interpretation of fossil benthic foraminiferal assemblages using modern analogues: possibilities and limitations. Statoil/Hydro. Full text in Research Archive
• Nagy, Jenø (2004). Trace fossils and their faces significance: an introduction. Kompendium i GEO 4220. Institutt for geofag. Full text in Research Archive
• Nagy, Jenø (2003). Microfossils and facies. Unipub forlag. Full text in Research Archive

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