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The Smithian–Spathian boundary in North Greenland: implications for extreme global climate changes

Published online by Cambridge University Press:  19 July 2019

Sofie Lindström Open the ORCID record for Sofie Lindström [Opens in a new window] ,
Morten Bjerager Open the ORCID record for Morten Bjerager [Opens in a new window] ,
Peter Alsen Open the ORCID record for Peter Alsen [Opens in a new window] ,
Hamed Sanei Open the ORCID record for Hamed Sanei [Opens in a new window]  and
Jørgen Bojesen-Koefoed Open the ORCID record for Jørgen Bojesen-Koefoed [Opens in a new window]
Sofie Lindström*
Affiliation:
Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
Morten Bjerager
Affiliation:
Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
Peter Alsen
Affiliation:
Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
Hamed Sanei
Affiliation:
Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, DK-8000 Aarhus, Denmark
Jørgen Bojesen-Koefoed
Affiliation:
Geological Survey of Denmark and Greenland, Øster Voldgade 10, DK-1350 Copenhagen K, Denmark
*
Author for correspondence: Sofie Lindström, Email: [email protected]
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Abstract

Smithian–lower Anisian strata in Peary Land, North Greenland, were deposited at ∼45° N on the northern margin of Pangaea in offshore to upper shoreface settings. The well-constrained succession (palynology and ammonite biostratigraphy) documents a remarkable shift from lycophyte spore-dominated assemblages in the upper Smithian to gymnosperm pollen-dominated ones in the lower Spathian in concert with a marked shift of +6 ‰ in δ13Corg. Correlation with other Smithian–Spathian boundary sections that record terrestrial floral changes indicates that the recovery of gymnosperms began earlier in the mid-latitudes of the Southern Hemisphere than in the Northern Hemisphere. The lycophyte-dominated Late Smithian Thermal Maximum is here interpreted as reflecting dry and hot climatic conditions with only brief seasonal precipitation unable to sustain large areas of gymnosperm trees, but able to revive dehydrated lycophytes. This suggests that the Late Smithian Thermal Maximum was a time of widespread aridity, which is also supported by red bed deposition in many areas globally, even as far south as Antarctica. The shift to gymnosperm-dominated vegetation during the cooling across the Smithian–Spathian boundary reflects a change to seasonally more humid climatic conditions favouring gymnosperm recovery, and could have been initiated by increased albedo over land due to the widespread aridity during the Late Smithian Thermal Maximum. The recovery of gymnosperm vegetation would have helped to draw down CO2 from the atmosphere and exacerbate global cooling.

Keywords

TriassicC-isotopepalynologythermal maximumcooling
Type
Original Article
Information
Geological Magazine , Volume 157 , Special Issue 10: Mesozoic of the Arctic , October 2020 , pp. 1547 - 1567
Copyright
© Cambridge University Press 2019

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References

Anderegg, WRL, Kane, JM and Anderegg, LDL (2013) Consequences of widespread tree mortality triggered by drought and temperature stress. Nature Climate Change 3, 30–6.CrossRefGoogle Scholar
Balme, BE (1963) Plant microfossils from the Lower Triassic of Western Australia. Palaeontology 6, 12–40.Google Scholar
Balme, BE (1995) Fossil in-situ spores and pollen grains – an annotated catalog. Review of Palaeobotany and Palynology 87, 81–323.CrossRefGoogle Scholar
Bjerager, M, Alsen, P, Hovikoski, J, Lindström, S, Stemmerik, L and Therkelsen, J (In press) Triassic lithostratigraphy of the Wandel Sea Basin, North Greenland. Bulletin of the Geological Society of Denmark.Google Scholar
Bordy, EM and Krummeck, WD (2016) Enigmatic continental burrows from the early Triassic transition of the Katberg and Burgersdorp Formations in the main Karoo Basin, South Africa. Palaios 31, 389–403.CrossRefGoogle Scholar
Borruel-Abadia, V, Lopez-Gomez, J, De la Horra, R, Galan-Abellan, B, Barrenechea, JF, Arche, A, Ronchi, A, Gretter, N and Marzo, M (2015) Climate changes during the Early–Middle Triassic transition in the E. Iberian plate and their palaeogeographic significance in the western Tethys continental domain. Palaeogeography, Palaeoclimatology, Palaeoecology 440, 671–89.CrossRefGoogle Scholar
Brayard, A, Bucher, H, Escarguel, G, Fluteau, F, Bourquin, S and Galfetti, T (2006) The Early Triassic ammonoid recovery: paleoclimatic significance of diversity gradients. Palaeogeography, Palaeoclimatology, Palaeoecology 239, 374–95.CrossRefGoogle Scholar
Brayard, A, Escarguel, G, Bucher, H and Bruhwiler, T (2009) Smithian and Spathian (Early Triassic) ammonoid assemblages from terranes: paleoceanographic and paleogeographic implications. Journal of Asian Earth Sciences 36, 420–33.CrossRefGoogle Scholar
Casshyap, SM (1979) Patterns of sedimentation in Gondwana basins. In Proceedings of the Fourth International Gondwana Symposium, Calcutta (eds Laskar, B and Rao, RCS), pp. 525–51. Delhi: Hindustan Publishing Corporation.Google Scholar
Chen, ZQ and Benton, MJ (2012) The timing and pattern of biotic recovery following the end-Permian mass extinction. Nature Geoscience 5, 375–83.CrossRefGoogle Scholar
Chen, ZQ, Tong, JN and Fraiser, ML (2011) Trace fossil evidence for restoration of marine ecosystems following the end-Permian mass extinction in the Lower Yangtze region, South China. Palaeogeography, Palaeoclimatology, Palaeoecology 299, 449–74.CrossRefGoogle Scholar
Clarkson, MO, Richoz, S, Wood, RA, Maurer, F, Krystyn, L, McGurty, DJ and Astratti, D (2013) A new high-resolution delta C-13 record for the Early Triassic: insights from the Arabian Platform. Gondwana Research 24, 233–42.CrossRefGoogle Scholar
Clemmensen, LB (1980) Triassic rift sedimentation and palaeogeography of central East Greenland. Bulletin Grønlands Geologiske Undersøgelse 136, 1–72.Google Scholar
Davin, EL and de Noblet-Ducoudre, N (2010) Climatic impact of global-scale deforestation: radiative versus nonradiative processes. Journal of Climate 23, 97–112.CrossRefGoogle Scholar
Dickens, GR, Oneil, JR, Rea, DK and Owen, RM (1995) Dissociation of oceanic methane hydrate as a cause of the carbon-isotope excursion at the end of the Paleocene. Paleoceanography 10, 965–71.CrossRefGoogle Scholar
Dolby, JH and Balme, BE (1976) Triassic palynology of the Carnarvon Basin, Western Australia. Review of Palaeobotany and Palynology 22, 105–68.CrossRefGoogle Scholar
Droser, ML and Bottjer, DJ (1986) A semiquantitative field classification of ichnofabric. Journal of Sedimentary Petrology 56, 558–9.CrossRefGoogle Scholar
Escapa, IH, Taylor, EL, Cuneo, R, Bomfleur, B, Bergene, J, Serbet, R and Taylor, TN (2011) Triassic floras of Antarctica: plant diversity and distribution in high paleolatitude communities. Palaios 26, 522–44.CrossRefGoogle Scholar
Fielding, CR, Frank, TD, McLoughlin, S, Vajda, V, Mays, C, Tevyaw, AP, Winguth, A, Winguth, C, Nicoll, RS, Bocking, M and Crowley, JL (2019) Age and pattern of the southern high-latitude continental end-Permian extinction constrained by multiproxy analysis. Nature Communications 10, 385. doi: 10.1038/s41467-018-07934-z.CrossRefGoogle ScholarPubMed
Fijałkowska, A (1994) Palynostratigraphy of the Lower and Middle Buntsandstein in north-western part of the Holy Cross Mts. Geological Quarterly 38, 59–96.Google Scholar
Fijałkowska-Mader, A (1999) Palynostratigraphy, palaeoecology and palaeoclimatology of the Triassic in south-eastern Poland. Zentralblatt für Geologie und Paläontologie, I 1998, 601–27.Google Scholar
Fröbisch, J, Angielczyk, KD and Sidor, CA (2010) The Triassic dicynodont Kombuisia (Synapsida, Anomodontia) from Antarctica, a refuge from the terrestrial Permian–Triassic mass extinction. Naturwissenschaften 97, 187–96.CrossRefGoogle ScholarPubMed
Galfetti, T, Bucher, H, Martini, R, Hochuli, PA, Weissert, H, Crasquin-Soleau, S, Brayard, A, Goudemand, N, Bruehwiler, T and Guodun, K (2008) Evolution of Early Triassic outer platform paleoenvironments in the Nanpanjiang Basin (South China) and their significance for the biotic recovery. Sedimentary Geology 204, 36–60.CrossRefGoogle Scholar
Galfetti, T, Bucher, H, Ovtcharova, M, Schaltegger, U, Brayard, A, Bruhwiler, T, Goudemand, N, Weissert, H, Hochuli, PA, Cordey, F and Guodun, KA (2007 a) Timing of the Early Triassic carbon cycle perturbations inferred from new U–Pb ages and ammonoid biochronozones. Earth and Planetary Science Letters 258, 593–604.CrossRefGoogle Scholar
Galfetti, T, Hochuli, PA, Brayard, A, Bucher, H, Weissert, H and Vigran, JO (2007 b) Smithian–Spathian boundary event: evidence for global climatic change in the wake of the end-Permian biotic crisis. Geology 35, 291–4.CrossRefGoogle Scholar
Grasby, SE, Beauchamp, B, Bond, DPG, Wignall, PB and Sanei, H (2016) Mercury anomalies associated with three extinction events (Capitanian Crisis, Latest Permian Extinction and the Smithian/Spathian Extinction) in NW Pangea. Geological Magazine 153, 285–97.CrossRefGoogle Scholar
Grasby, SE, Beauchamp, B, Embry, A and Sanei, H (2013 a) Recurrent Early Triassic ocean anoxia. Geology 41, 175–8.CrossRefGoogle Scholar
Grasby, SE, Sanei, H, Beauchamp, B and Chen, ZH (2013 b) Mercury deposition through the Permo-Triassic Biotic Crisis. Chemical Geology 351, 209–16.CrossRefGoogle Scholar
Grauvogel-Stamm, L. 1999. Pleuromeia sternbergii (Munster) Corda, eine charackteristische Pflanze des deutschen Buntsandsteins. In Trias, Eine ganz andere Welt, Mitteleuropa im frühen Erdmittelalter (eds Hauschke, N and Wilde, V), pp. 271–82. München: Pfeil.Google Scholar
Haig, DW, Martin, SK, Mory, AJ, McLoughlin, S, Backhouse, J, Berrell, RW, Kear, BP, Hall, RJ, Foster, CB, Shi, GR and Bevan, JC (2015) Early Triassic (early Olenekian) life in the interior of East Gondwana: mixed marine–terrestrial biota from the Kockatea Shale, Western Australia. Palaeogeography, Palaeoclimatology, Palaeoecology 417, 511–33.CrossRefGoogle Scholar
Hankel, O (1991) Early Triassic plant microfossils from the Kavee Quarry section of the Lower Mariakani Formation, Kenya. Review of Palaeobotany and Palynology 68, 127–45.CrossRefGoogle Scholar
Hankel, O (1993) Early Triassic plant microfossils from Sakamena sediments of the Majunga Basin, Madagascar. Review of Palaeobotany and Palynology 77, 213–33.CrossRefGoogle Scholar
Harrowfield, M, Holdgate, GR, Wilson, CJL and McLoughlin, S (2005) Tectonic significance of the Lambert Graben, East Antarctica: reconstructing the Gondwanan rift. Geology 33, 197–200.CrossRefGoogle Scholar
Hermann, E, Hochuli, PA, Bucher, H, Bruhwiler, T, Hautmann, M, Ware, D, Weissert, H, Roohi, G, Yaseen, A and Khalil ur, R (2012 a) Climatic oscillations at the onset of the Mesozoic inferred from palynological records from the North Indian Margin. Journal of the Geological Society, London 169, 227–37.CrossRefGoogle Scholar
Hermann, E, Hochuli, PA, Bucher, H and Roohi, G (2012 b) Uppermost Permian to Middle Triassic palynology of the Salt Range and Surghar Range, Pakistan. Review of Palaeobotany and Palynology 169, 61–95.CrossRefGoogle Scholar
Hermann, E, Hochuli, PA, Mehay, S, Bucher, H, Bruhwiler, T, Ware, D, Hautmann, M, Roohi, G, ur-Rehman, K and Yaseen, A (2011) Organic matter and palaeoenvironmental signals during the Early Triassic biotic recovery: the Salt Range and Surghar Range records. Sedimentary Geology 234, 19–41.CrossRefGoogle Scholar
Hicke, JA, Allen, CD, Desai, AR, Dietze, MC, Hall, RJ, Hogg, EH, Kashian, DMMoore, D, Raffa, KF, Sturrock, RN and Vogelmann, J (2012) Effects of biotic disturbances on forest carbon cycling in the United States and Canada. Global Change Biology 18, 7–34.CrossRefGoogle Scholar
Hochuli, PA, Sanson-Barrera, A, Schneebeli-Hermann, E and Bucher, H (2016) Severest crisis overlooked – worst disruption of terrestrial environments postdates the Permian–Triassic mass extinction. Scientific Reports 6, 28372. doi: 10.1038/srep28372.CrossRefGoogle ScholarPubMed
Hochuli, PA and Vigran, JO (2010) Climate variations in the Boreal Triassic – inferred from palynological records from the Barents Sea. Palaeogeography, Palaeoclimatology, Palaeoecology 290, 20–42.CrossRefGoogle Scholar
Horacek, M, Koike, T and Richoz, S (2009) Lower Triassic delta C-13 isotope curve from shallow-marine carbonates in Japan, Panthalassa realm: confirmation of the Tethys delta C-13 curve. Journal of Asian Earth Sciences 36, 481–90.CrossRefGoogle Scholar
Horacek, M, Richoz, S, Brandner, R, Krystyn, L and Spotl, C (2007) Evidence for recurrent changes in Lower Triassic oceanic circulation of the Tethys: the delta C-13 record from marine sections in Iran. Palaeogeography, Palaeoclimatology, Palaeoecology 252, 355–69.CrossRefGoogle Scholar
Håkansson, E (1979) Carboniferous to Tertiary development of the Wandel Sea Basin, eastern North Greenland. Grønlands Geologiske Undersøgelse, Report 88, 73–83.Google Scholar
Kaim, A and Nutzel, A (2011) Dead bellerophontids walking – the short Mesozoic history of the Bellerophontoidea (Gastropoda). Palaeogeography, Palaeoclimatology, Palaeoecology 308, 190–9.CrossRefGoogle Scholar
Komatsu, T, Naruse, H, Shigeta, Y, Takashima, R, Maekawa, T, Dang, HT, Dinh, TC, Nguyen, PD, Nguyen, HH, Tanaka, G and Sone, M (2014) Lower Triassic mixed carbonate and siliciclastic setting with Smithian–Spathian anoxic to dysoxic facies, An Chau basin, northeastern Vietnam. Sedimentary Geology 300, 28–48.CrossRefGoogle Scholar
Komatsu, T, Takashima, R, Shigeta, Y, Maekawa, T, Tran, HD, Cong, TD, Sakata, S, Dinh, HD and Takahashi, O (2016) Carbon isotopic excursions and detailed ammonoid and conodont biostratigraphies around Smithian–Spathian boundary in the Bac Thuy Formation, Vietnam. Palaeogeography, Palaeoclimatology, Palaeoecology 454, 65–74.CrossRefGoogle Scholar
Kustatscher, E, Franz, M, Heunisch, C, Reich, M and Wappler, T (2014) Floodplain habitats of braided river systems: depositional environment, flora and fauna of the Solling Formation (Buntsandstein, Lower Triassic) from Bremke and Furstenberg (Germany). Palaeobiodiversity and Palaeoenvironments 94, 237–70.CrossRefGoogle Scholar
Kürschner, WM and Herngreen, GFW (2010) Triassic palynology of central and northwestern Europe: a review of palynofloral diversity patterns and biostratigraphic subdivisions. In Triassic Timescale (ed. Lucas, SG), pp. 263–83. Geological Society of London, Special Publication no. 334.Google Scholar
Lindström, S and McLoughlin, S (2007) Synchronous palynofloristic extinction and recovery after the end-Permian event in the Prince Charles Mountains, Antarctica: implications for palynofloristic turnover across Gondwana. Review of Palaeobotany and Palynology 145, 89–122.CrossRefGoogle Scholar
Looy, CV, Brugman, WA, Dilcher, DL and Visscher, H (1999) The delayed resurgence of equatorial forests after the Permian–Triassic ecologic crisis. Proceedings of the National Academy of Sciences of the United States of America 96, 13857–62.CrossRefGoogle ScholarPubMed
McLoughlin, S, Lindström, S and Drinnan, AN (1997) Gondwanan floristic and sedimentological trends during the Permian–Triassic transition: new evidence from the Amery Group, northern Prince Charles Mountains, East Antarctica. Antarctic Science 9, 281–98.CrossRefGoogle Scholar
Meyer, KM, Yu, M, Jost, AB, Kelley, BM and Payne, JL (2011) delta C-13 evidence that high primary productivity delayed recovery from end-Permian mass extinction. Earth and Planetary Science Letters 302, 378–84.CrossRefGoogle Scholar
Neveling, J (2004) Stratigraphic and sedimentological investigation of the contact between the Lystrosaurus and the Cynognathus Assemblage Zones (Beaufort group: Karoo Supergroup). Council for Geoscience Bulletin 137, 1–164.Google Scholar
Orchard, MJ (2007) Conodont diversity and evolution through the latest Permian and Early Triassic upheavals. Palaeogeography, Palaeoclimatology, Palaeoecology 252, 93–117.CrossRefGoogle Scholar
Orlowska-Zwolińska, T (1984) Palynostratigraphy of the Buntsandstein in sections of western Poland. Acta Palaeontologica Polonica 29, 107–17.Google Scholar
Ovtcharova, M, Bucher, H, Schaltegger, U, Galfetti, T, Brayard, A and Guex, J (2006) New Early to Middle Triassic U–Pb ages from South China: calibration with ammonoid biochronozones and implications for the timing of the Triassic biotic recovery. Earth and Planetary Science Letters 243, 463–75.CrossRefGoogle Scholar
Payne, JL, Lehrmann, DJ, Wei, JY, Orchard, MJ, Schrag, DP and Knoll, AH (2004) Large perturbations of the carbon cycle during recovery from the end-Permian extinction. Science 305, 506–9.CrossRefGoogle ScholarPubMed
Preto, N, Kustatscher, E and Wignall, PB (2010) Triassic climates – state of the art and perspectives. Palaeogeography, Palaeoclimatology, Palaeoecology 290, 1–10.CrossRefGoogle Scholar
Radley, JD and Coram, RA (2016) The Chester Formation (Early Triassic, southern Britain): sedimentary response to extreme greenhouse climate? Proceedings of the Geologists’ Association 127, 552–7.CrossRefGoogle Scholar
Retallack, G (1975) The life and times of a Triassic lycopod. Alcheringa 1, 3–29.CrossRefGoogle Scholar
Retallack, GJ, Veevers, JJ and Morante, R (1996) Global coal gap between Permian–Triassic extinction and Middle Triassic recovery of peat-forming plants. Geological Society of America Bulletin 108, 195–207.2.3.CO;2>CrossRefGoogle Scholar
Romano, C, Goudemand, N, Vennemann, TW, Ware, D, Schneebeli-Hermann, E, Hochuli, PA, Bruhwiler, T, Brinkmann, W and Bucher, H (2013) Climatic and biotic upheavals following the end-Permian mass extinction. Nature Geoscience 6, 57–60.CrossRefGoogle Scholar
Romano, C, Jenks, JF, Jattiot, R, Scheyer, TM, Bylund, KG and Bucher, H (2017) Marine Early Triassic Actinopterygii from Elko County (Nevada, USA): implications for the Smithian equatorial vertebrate eclipse. Journal of Paleontology 91, 1025–46.CrossRefGoogle Scholar
Saito, R, Kaiho, K, Oba, M, Takahashi, S, Chen, ZQ and Tong, JN (2013) A terrestrial vegetation turnover in the middle of the Early Triassic. Global and Planetary Change 105, 152–9.CrossRefGoogle Scholar
Schneebeli-Hermann, E, Hochuli, PA and Bucher, H (2017) Palynofloral associations before and after the Permian–Triassic mass extinction, Kap Stosch, East Greenland. Global and Planetary Change 155, 178–95.CrossRefGoogle Scholar
Schneebeli-Hermann, E, Hochuli, PA, Bucher, H, Goudemand, N, Bruhwiler, T and Galfetti, T (2012) Palynology of the Lower Triassic succession of Tulong, South Tibet – evidence for early recovery of gymnosperms. Palaeogeography, Palaeoclimatology, Palaeoecology 339, 12–24.CrossRefGoogle Scholar
Schneebeli-Hermann, E, Kürschner, WM, Kerp, H, Bomfleur, B, Hochuli, PA, Bucher, H, Ware, D and Roohi, G (2015) Vegetation history across the Permian–Triassic boundary in Pakistan (Amb section, Salt Range). Gondwana Research 27, 911–24.CrossRefGoogle Scholar
Schulz, E (1964) Sporen und pollen aus dem Mittleren Buntsandstein des germanischen Beckens. Monatsberichte der deutschen Akademie der Wissenschaften 6, 597–606.Google Scholar
Segroves, KL (1970) Permian spores and pollen from the Perth Basin, Western Australia. Grana 10, 43–73.CrossRefGoogle Scholar
Shigeta, Y, Zakharov, YD, Maeda, H and Popov, AM (2009) The Lower Triassic System in the Abrek Bay Area, South Primorye, Russia. Tokyo: National Museum of Nature and Science.Google Scholar
Stanley, SM (2009) Evidence from ammonoids and conodonts for multiple Early Triassic mass extinctions. Proceedings of the National Academy of Sciences of the United States of America 106, 15264–67.CrossRefGoogle ScholarPubMed
Sun, YD, Joachimski, MM, Wignall, PB, Yan, CB, Chen, YL, Jiang, HS, Wang, LN and Lai, XL (2012) Lethally hot temperatures during the early Triassic Greenhouse. Science 338, 366–70.CrossRefGoogle ScholarPubMed
Sun, YD, Wignall, PB, Joachimski, MM, Bond, DPG, Grasby, SE, Sun, S, Yan, CB, Wang, LN, Chen, YL and Lai, XL (2015) High amplitude redox changes in the late Early Triassic of South China and the Smithian–Spathian extinction. Palaeogeography, Palaeoclimatology, Palaeoecology 427, 62–78.CrossRefGoogle Scholar
Thomazo, C, Brayard, A, Elmeknassi, S, Vennin, E, Olivier, N, Caravaca, G, Escarguel, G, Fara, E, Bylund, KG, Jenks, JF, Stephen, DA, Killingsworth, B, Sansjofre, P and Cartigny, P (2019) Multiple sulfur isotope signals associated with the late Smithian event and the Smithian/Spathian boundary. Earth-Science Reviews, published online 2 July 2018. doi: 10.1016/j.earscirev.2018.06.019.CrossRefGoogle Scholar
Tong, JA, Zuo, JX and Chen, ZQ (2007) Early Triassic carbon isotope excursions from South China: proxies for devastation and restoration of marine ecosystems following the end-Permian mass extinction. Geological Journal 42, 371–89.Google Scholar
Tozer, ET (1994) Canadian Triassic ammonoid faunas. Geological Survey of Canada Bulletin 467, 1–663.Google Scholar
Van der Zwan, CJ and Spaak, P (1992) Lower to Middle Triassic sequence stratigraphy and climatology of the Netherlands, a model. Palaeogeography, Palaeoclimatology, Palaeoecology 91, 277–90.CrossRefGoogle Scholar
VanBuren, R, Wai, CM, Ou, S, Pardo, J, Bryant, D, Jiang, N, Mockler, TC, Edger, P and Michael, TP (2018) Extreme haplotype variation in the desiccation-tolerant clubmoss Selaginella lepidophylla. Nature Communications 9, 13.CrossRefGoogle ScholarPubMed
Vigran, JO, Bugge, T, Mangerud, G, Weitschat, W and Mørk, A (1998) Biostratigraphy and sequence stratigraphy of the Lower and Middle Triassic deposits from the Svalis Dome, Central Barents Sea, Norway. Palynology 22, 89–141.CrossRefGoogle Scholar
Vigran, JO, Mangerud, G, Mørk, A, Worsley, D and Hochuli, PA (2014) Palynology and geology of the Triassic succession of Svalbard and the Barents Sea. Geological Survey of Norway Special Publication 14, 1–247.Google Scholar
Visscher, H (1974) The impact of palynology on Permian and Triassic stratigraphy in Western Europe. Review of Palaeobotany and Palynology 17, 5–19.CrossRefGoogle Scholar
Wignall, PB, Bond, DPG, Sun, YD, Grasby, SE, Beauchamp, B, Joachimski, MM and Blomeier, DPG (2016) Ultra-shallow-marine anoxia in an Early Triassic shallow-marine clastic ramp (Spitsbergen) and the suppression of benthic radiation. Geological Magazine 153, 316–31.CrossRefGoogle Scholar
Zhang, L, Zhao, L, Chen, ZQ, Algeo, TJ, Li, Y and Cao, L (2015) Amelioration of marine environments at the Smithian–Spathian boundary, Early Triassic. Biogeosciences 12, 1597–613.CrossRefGoogle Scholar