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Integrated Cambrian biostratigraphy and carbon isotope chemostratigraphy of the Grönhögen-2015 drill core, Öland, Sweden



The Grönhögen-2015 core drilling on southern Öland, Sweden, penetrated 50.15 m of Cambrian Series 3, Furongian and Lower–Middle Ordovician strata. The Cambrian succession includes the Äleklinta Member (upper Stage 5) of the Borgholm Formation and the Alum Shale Formation (Guzhangian–Tremadocian). Agnostoids and trilobites allowed subdivision of the succession into eight biozones, in ascending order: the uppermost Cambrian Series 3 (Guzhangian) Agnostus pisiformis Zone and the Furongian Olenus gibbosus, O. truncatus, Parabolina spinulosa, Sphaerophthalmus? flagellifer, Ctenopyge tumida, C. linnarssoni and Parabolina lobata zones. Conspicuous lithologic unconformities and the biostratigraphy show that the succession is incomplete and that there are several substantial gaps of variable magnitudes. Carbon isotope analyses (δ13Corg) through the Alum Shale Formation revealed two globally significant excursions: the Steptoean Positive Carbon Isotope Excursion (SPICE) in the lower–middle Paibian Stage, and the negative Top of Cambrian Excursion (TOCE), previously referred to as the HERB Event, in Stage 10. The δ13Corg chemostratigraphy is tied directly to the biostratigraphy and used for an improved integration of these excursions with the standard agnostoid and trilobite zonation of Scandinavia. Their relations to that of coeval successions in Baltoscandia and elsewhere are discussed. The maximum amplitudes of the SPICE and TOCE in the Grönhögen succession are comparable to those recorded in drill cores retrieved from Scania, southern Sweden. The results of this study will be useful for assessing biostratigraphic relations between shale successions and carbonate facies on a global scale.


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Ahlberg, P. 2003. Trilobites and intercontinental tie points in the Upper Cambrian of Scandinavia. Geologica Acta 1, 127–34.
Ahlberg, P., Axheimer, N., Babcock, L. E., Eriksson, M. E., Schmitz, B. & Terfelt, F. 2009. Cambrian high-resolution biostratigraphy and carbon isotope chemostratigraphy in Scania, Sweden: first record of the SPICE and DICE excursions in Scandinavia. Lethaia 42, 216.
Ahlberg, P. & Terfelt, F. 2012. Furongian (Cambrian) agnostoids of Scandinavia and their implications for intercontinental correlation. Geological Magazine 149, 1001–12.
Álvaro, J. J., Ahlberg, P., Babcock, L. E., Bordonaro, O. L., Choi, D. K., Cooper, R. A., Ergaliev, G. Kh., Gapp, I. W., Ghobadi Pour, M., Hughes, N. C., Jago, J. B., Korovnikov, I., Laurie, J. R., Lieberman, B. S., Paterson, J. R., Pegel, T. V., Popov, L. E., Rushton, A. W. A., Sukhov, S. S., Tortello, M. F., Zhou, Z. & Żylińska, A. 2013. Chapter 19. Global Cambrian trilobite palaeobiogeography assessed using parsimony analysis of endemicity. In Early Palaeozoic Biogeography and Palaeogeography (eds Harper, D. A. T. & Servais, T.), pp. 273–96. Geological Society of London, Memoirs no. 38.
Andersson, A., Dahlman, B., Gee, D. G. & Snäll, S. 1985. The Scandinavian Alum Shales. Sveriges geologiska undersökning Ca56, 150.
Axheimer, N. & Ahlberg, P. 2003. A core drilling through Cambrian strata at Almbacken, Scania, S. Sweden: trilobites and stratigraphical assessment. GFF 125, 139–56.
Axheimer, N., Eriksson, M. E., Ahlberg, P. & Bengtsson, A. 2006. The middle Cambrian cosmopolitan key species Lejopyge laevigata and its biozone: new data from Sweden. Geological Magazine 143, 447–55.
Azmy, K. 2018. Carbon-isotope stratigraphy of the uppermost Cambrian in eastern Laurentia: implications for global correlation. Geological Magazine, published online 12 February 2018. doi: 10.1017/S001675681800002X.
Babcock, L. E., Peng, S. C. & Ahlberg, P. 2017. Cambrian trilobite biostratigraphy and its role in developing an integrated history of the Earth system. Lethaia 50, 381–99.
Bagnoli, G. & Stouge, S. 2014. Upper Furongian (Cambrian) conodonts from the Degerhamn quarry road section, southern Öland, Sweden. GFF 136, 436–58.
Belt, T. 1867. On some new trilobites from the Upper Cambrian rocks of North Wales. Geological Magazine 4, 294–95.
Bergström, J. & Ahlberg, P. 1981. Uppermost Lower Cambrian biostratigraphy in Scania, Sweden. Geologiska Föreningens i Stockholm Förhandlingar 103, 193214.
Bergström, J. & Gee, D. G. 1985. The Cambrian in Scandinavia. In The Caledonide Orogen – Scandinavia and Related Areas (eds Gee, D. G. & Sturt, B. A.), pp. 247–71. Chichester: John Wiley and Sons.
Boeck, C. 1838. Uebersicht der bisher in Norwegen gefundenen Formen der Trilobiten. In Gaea Norvegica (ed. Keilhau, B. M.), pp.138–45. Christiania (Oslo): Johan Dahl.
Brasier, M. D. 1993. Towards a carbon isotope stratigraphy of the Cambrian System: potential of the Great Basin succession. In High Resolution Stratigraphy (eds Hailwood, E. A. & Kidd, R. B.), pp. 341–50. Geological Society of London, Special Publication no. 70.
Brünnich, M. T. 1781. Beskrivelser over trilobiten, en dyreslægt og dens arter med en ny arts aftegning. Nye Samling af det kongelige Danske Videnskabers Selskabs Skrifter 1, 384–95.
Buchardt, B., Nielsen, A. T. & Schovsbo, N. H. 1997. Alunskiferen i Skandinavien. Geologisk Tidsskrift 1997 (3), 130.
Calner, M., Ahlberg, P., Lehnert, O. & Erlström, M. (eds) 2013. The Lower Palaeozoic of southern Sweden and the Oslo Region, Norway. Field Guide for the 3rdAnnual Meeting of the IGCP project 591. Sveriges geologiska undersökning Rapporter och meddelanden 133, 196.
Cocks, L. M. & Fortey, R. A. 1998. The Lower Palaeozoic margins of Baltica. GFF 120, 173–9.
Cocks, L. M. & Torsvik, T. H. 2005. Baltica from the late Precambrian to mid-Palaeozoic times: the gain and loss of a terrane's identity. Earth-Science Reviews 72, 3966.
Egenhoff, S. O., Fishman, N. S., Ahlberg, P., Maletz, J., Jackson, A., Kolte, K., Lowers, H., Mackie, J., Newby, W. & Petrowsky, M. 2015. Sedimentology of SPICE (Steptoean positive carbon isotope excursion): a high-resolution trace fossil and microfabric analysis of the middle to late Cambrian Alum Shale Formation, southern Sweden. Geological Society of America Special Paper 515, 87102.
Erlström, M. 2016. Litologisk och geokemisk karaktärisering av berggrundsavsnitt på södra Öland – resultat från kärnborrning vid Grönhögen. SGU-rapport 15, 137.
Gill, B. C., Lyons, T. W., Young, S. A., Kump, L. R., Knoll, A. H. & Saltzman, M. R. 2011. Geochemical evidence for widespread euxinia in the later Cambrian ocean. Nature 469, 80–3.
Hammer, Ø. & Svensen, H. H. 2017. Biostratigraphy and carbon and nitrogen geochemistry of the SPICE event in Cambrian low-grade metamorphic black shale, southern Norway. Palaeogeography, Palaeoclimatology, Palaeoecology 468, 216–27.
Henningsmoen, G. 1957. The trilobite family Olenidae with description of Norwegian material and remarks on the Olenid and Tremadocian Series. Skrifter utgitt av Det Norske Videnskaps–Akademi i Oslo, I. Matematisk–Naturvidenskapelig Klasse 1957 (1), 1303.
Høyberget, M. & Bruton, D. L. 2008. Middle Cambrian trilobites of the suborders Agnostina and Eodiscina from the Oslo Region, Norway. Palaeontographica Abteilung A 286, 187.
Høyberget, M. & Bruton, D. L. 2012. Revision of the trilobite genus Sphaerophthalmus and relatives from the Furongian (Cambrian) Alum Shale Formation, Oslo Region, Norway. Norwegian Journal of Geology 92, 433–50.
Kouchinsky, A., Bengtson, S., Gallet, Y., Korovnikov, I., Pavlov, V., Runnegar, B., Shields, G., Veizer, J., Young, E. & Ziegler, K. 2008. The SPICE carbon isotope excursion in Siberia: a combined study of the upper Middle Cambrian–lowermost Ordovician Kulyumbe River section, northwestern Siberian Platform. Geological Magazine 145, 609–22.
Lake, P. 1919. A monograph of British Cambrian trilobites, Pt. V. Monographs of the Palaeontographical Society 71, 89120.
Landing, E., Westrop, S. R. & Adrain, J. M. 2011. The Lawsonian Stage – the Eoconodontus notchpeakensis FAD and HERB carbon isotope excursion define a globally correlatable terminal Cambrian stage. Bulletin of Geosciences 86, 621–40.
Lehnert, O., Ahlberg, P., Calner, M. & Joachimski, M. M. 2013. The Drumian Isotopic Carbon Excursion (DICE) in Scania, southern Sweden – a mirror of the onset of the Marjumiid Biomere at a time of increased primary production? In Proceedings of the 3rd IGCP 591 Annual Meeting – Lund, Sweden, 9–19 June 2013 (eds Lindskog, A. & Mehlqvist, K.), pp. 172–4. Lund: Lund University.
Li, D. D., Zhang, X. L., Chen, K, Zhang, G., Chen, X. Y., Huang, W., Peng, S. C. & Shen, Y. 2017. High-resolution C-isotope chemostratigraphy of the uppermost Cambrian stage (Stage 10) in South China: implications for defining the base of Stage 10 and palaeoenvironmental change. Geological Magazine 154, 1232–43.
Lim, J. N., Chung, G. S., Park, T. Y. & Lee, K. S. 2016. Lithofacies and stable carbon isotope stratigraphy of the Cambrian Sesong Formation in the Taebaeksan Basin, Korea. Journal of the Korean Earth Science Society 36, 617–31.
Lindskog, A. & Eriksson, M. E. 2017. Megascopic processes reflected in the microscopic realm: sedimentary and biotic dynamics of the Middle Ordovician “orthoceratite limestone” at Kinnekulle, Sweden. GFF 139, 163–83.
Linnarsson, G. 1875. Öfversigt af Nerikes öfvergångsbildningar. Öfversigt af Kongliga Vetenskapsakademiens Förhandlingar 1875, 348.
Lundberg, F., Ahlberg, P., Eriksson, M. E. & Lindskog, A. 2016. Integrated Cambrian stratigraphy of the Tomten-1 drill core, southern Sweden. In Palaeo Down Under 2, Adelaide, 11–15 July 2016 (eds Laurie, J. R., Kruse, P. D., García-Bellido, D. G. & Holmes, J. D.), pp. 76–7. Geological Society of Australia Abstracts no. 117.
Martinsson, A. 1974. The Cambrian of Norden. In Lower Palaeozoic Rocks of the World. 2. Cambrian of the British Isles, Norden, and Spitsbergen (ed. Holland, C. H.), pp. 185283. London: John Wiley & Sons.
Miller, J. F., Evans, K. R., Freeman, R. L., Ripperdan, R. L. & Taylor, J. F. 2011. Proposed stratotype for the base of the Lawsonian Stage (Cambrian Stage 10) at the First Appearance Datum of Eoconodontus notchpeakensis (Miller) in the House Range, Utah, USA. Bulletin of Geosciences 86, 595620.
Miller, J. F., Evans, K. R., Freeman, R. L., Ripperdan, R. L. & Taylor, J. F. 2014. The proposed GSSP for the base of Cambrian Stage 10 at the First Appearance Datum of the conodont Eoconodontus notchpeakensis (Miller, 1969) in the House Range, Utah, USA. GFF 136, 189–92.
Miller, J. F., Ripperdan, R. L., Loch, J. D., Freeman, R. L., Evans, K. R., Taylor, J. F. & Tolbart, Z. C. 2015. Proposed GSSP for the base of Cambrian Stage 10 at the lowest occurrence of Eoconodontus notchpeakensis in the House Range, Utah, USA. Annales de Paléontologie 101, 199211.
Montañez, I. P., Osleger, D. A., Banner, J. L., Mack, L. E. & Masgrove, M. L. 2000. Evolution of the Sr and C isotope composition of Cambrian oceans. GSA Today 10, 17.
Ng, T. W., Yuan, J. L. & Lin, J. P. 2014. The North China Steptoean positive carbon isotope excursion and its global correlation with the base of the Paibian Stage (early Furongian Series), Cambrian. Lethaia 47, 153–64.
Nielsen, A. T. & Schovsbo, N. H. 2007. Cambrian to basal Ordovician lithostratigraphy in southern Scandinavia. Bulletin of the Geological Society of Denmark 53, 4792.
Nielsen, A. T. & Schovsbo, N. H. 2011. The Lower Cambrian of Scandinavia: depositional environment, sequence stratigraphy and palaeogeography. Earth-Science Reviews 107, 207310.
Nielsen, A. T. & Schovsbo, N. H. 2013. The Cambro-Ordovician Alum Shale revisited: depositional environment, sea-level changes and transient isostatic disturbances. In Proceedings of the 3rd IGCP 591 Annual Meeting– Lund, Sweden, 9–19 June 2013 (eds Lindskog, A. & Mehlqvist, K.), pp. 249–51. Lund: Lund University.
Nielsen, A. T. & Schovsbo, N. H. 2015. The regressive Early-Mid Cambrian ‘Hawke Bay Event’ in Baltoscandia: epeirogenic uplift in concert with eustasy. Earth-Science Reviews 151, 288350.
Nielsen, A. T., Weidner, T., Terfelt, F. & Høyberget, M. 2014. Upper Cambrian (Furongian) biostratigraphy in Scandinavia revisited: definition of superzones. GFF 136, 193–7.
Peng, S. C., Babcock, L. E. & Cooper, R. A. 2012. The Cambrian Period. In The Geologic Time Scale 2012 (eds Gradstein, F. M., Ogg, J. G., Schmitz, M. D. & Ogg, G. M.), pp. 437–88. Oxford: Elsevier.
Peng, S. C., Babcock, L. E., Robison, R. A., Lin, H. L., Rees, M. N. & Saltzman, M. R. 2004. Global Standard Stratotype-section and Point (GSSP) of the Furongian Series and Paibian Stage (Cambrian). Lethaia 37, 365–79.
Phillips, J. 1848. The Malvern Hills compared with the Palaeozoic districts of Abberley, Woolhope, May Hill, Torthworth, and Usk. Memoirs of the Geological Survey of Great Britain 2, 1330.
Rasmussen, B. W., Nielsen, A. T. & Schovsbo, N. H. 2015. Faunal succession in the upper Cambrian (Furongian) Leptoplastus Superzone at Slemmestad, southern Norway. Norwegian Journal of Geology 95, 122.
Rasmussen, B. W., Rasmussen, J. A. & Nielsen, A. T. 2017. Biostratigraphy of the Furongian (upper Cambrian) Alum Shale Formation at Degerhamn, Öland, Sweden. GFF 139, 92118.
Ripperdan, R. L. 2002. The HERB Event: end of Cambrian carbon cycle paradigm? Geological Society of America, Abstracts with Programs 34 (6), 413.
Ripperdan, R. L., Magaritz, M., Nicoll, R. S. & Shergold, J. H. 1992. Simultaneous changes in carbon isotopes, sea level, and conodont biozones within the Cambrian–Ordovician boundary interval at Black Mountain, Australia. Geology 20, 1039–42.
Saltzman, M. R., Cowan, C. A., Runkel, A. C., Runnegar, B., Stewart, M. C. & Palmer, A. R. 2004. The Late Cambrian SPICE (δ13C) event and the Sauk II–Sauk III regression: new evidence from Laurentian basins in Utah, Iowa, and Newfoundland. Journal of Sedimentary Research 74, 366–77.
Saltzman, M. R., Ripperdan, R. L., Brasier, M. D., Lohmann, K. C., Robison, R. A., Chang, W. T., Peng, S. C., Ergaliev, E. K. & Runnegar, B. 2000. A global carbon isotope excursion (SPICE) during the Late Cambrian: relation to trilobite extinctions, organic-matter burial and sea level. Palaeogeography, Palaeoclimatology, Palaeoecology 162, 211–23.
Schiffbauer, J. D., Huntley, J. W., Fike, D. A., Jeffrey, M. J., Gregg, J. M. & Shelton, K. L. 2017. Decoupling biogeochemical records, extinction, and environmental change during the Cambrian SPICE event. Science Advances 3 (3), e1602158. doi: 10.1126/sciadv.1602158.
Schovsbo, N. H. 2001. Why barren intervals? A taphonomic case study of the Scandinavian Alum Shale and its faunas. Lethaia 34, 271–85.
Schovsbo, N. H. 2002. Uranium enrichment shorewards in black shales: a case study from the Scandinavian Alum Shale. GFF 124, 107–15.
Sial, A. N., Peralta, S., Ferreira, V. P., Toselli, A. J., Aceñolaza, F. G., Parada, M. A., Gaucher, C., Alonso, R. N. & Pimentel, M. M. 2008. Upper Cambrian carbonate sequences of the Argentine Precordillera and the Steptoean C-Isotope positive excursion (SPICE). Gondwana Research 13, 437–52.
Sial, A. N., Peralta, S., Gaucher, C., Toselli, A. J., Ferreira, V. P., Frei, R., Parada, M. A., Pimentel, M. M. & Pereira, N. S. 2013. High-resolution stable isotope stratigraphy of the upper Cambrian and Ordovician in the Argentine Precordillera: carbon isotope excursions and correlations. Gondwana Research 24, 330–48.
Stouge, S., Bagnoli, G. & Azmi, K. 2016. The Cambrian HERB excursion (Furongian) from the Martin Point Formation of the Cow Head Group, western Newfoundland, Canada. In Palaeo Down Under 2, Adelaide, 11–15 July 2016 (eds Laurie, J. R., Kruse, P. D., García-Bellido, D. G. & Holmes, J. D.), p. 56. Geological Society of Australia Abstracts no. 117.
Terfelt, F. 2003. Upper Cambrian trilobite biostratigraphy and taphonomy at Kakeled on Kinnekulle, Västergötland, Sweden. Acta Palaeontologica Polonica 48, 409–16.
Terfelt, F., Ahlberg, P. & Eriksson, M. E. 2011. Complete record of Furongian polymerid trilobites and agnostoids of Scandinavia – a biostratigraphical scheme. Lethaia 44, 814.
Terfelt, F., Eriksson, M. E., Ahlberg, P. & Babcock, L. E. 2008. Furongian Series (Cambrian) biostratigraphy of Scandinavia – a revision. Norwegian Journal of Geology 88, 7387.
Terfelt, F., Eriksson, M. E. & Schmitz, B. 2014. The Cambrian–Ordovician transition in dysoxic facies in Baltica – diverse faunas and carbon isotope anomalies. Palaeogeography, Palaeoclimatology, Palaeoecology 394, 5973.
Thickpenny, A. 1984. The sedimentology of the Swedish Alum Shales. In Fine-grained Sediments: Deepwater Processes and Facies (eds Stow, D. A. W. & Piper, D. J. W.), pp. 511–25. Geological Society of London, Special Publication no. 15.
Thickpenny, A. 1987. Palaeo-oceanography and depositional environment of the Scandinavian Alum Shales: sedimentological and geochemical evidence. In Marine Clastic Sedimentology – Concepts and Case Studies (eds Leggett, J. K. & Zuffa, G. G.), pp. 156–71. London: Graham & Trotman.
Torsvik, T. H. & Cocks, L. M. 2005. Norway in space and time: a centennial cavalcade. Norwegian Journal of Geology 85, 7386.
Torsvik, T. H. & Cocks, L. M. 2013. Chapter 2. New global palaeogeographical reconstructions for the Early Palaeozoic and their generation. In Early Palaeozoic Biogeography and Palaeogeography (eds Harper, D. A. T. & Servais, T.), pp. 524. Geological Society of London, Memoirs no. 38.
Torsvik, T. H. & Cocks, L. M. 2017. Earth History and Palaeogeography. Cambridge: Cambridge University Press, 317 pp.
Torsvik, T. H. & Rehnström, E. F. 2001. Cambrian palaeomagnetic data from Baltica: implications for true polar wander and Cambrian palaeogeography. Journal of the Geological Society, London 158, 321–9.
Wærn, B. 1952. Palaeontology and stratigraphy of the Cambrian and lowermost Ordovician of the Bödahamn core. Bulletin of the Geological Institution of the University of Uppsala 34, 223–50.
Wahlenberg, G. 1818. Petrificata telluris svecanae. Nova Acta Regiae Societatis Scientiarum Upsaliensis 8, 1116.
Weidner, T. & Nielsen, A. T. 2009. The Middle Cambrian Paradoxides paradoxissimus Superzone on Öland, Sweden. GFF 131, 253–68.
Weidner, T. & Nielsen, A. T. 2013. The late Cambrian (Furongian) Acerocarina Superzone (new name) on Kinnekulle, Västergötland, Sweden. GFF 135, 3044.
Westergård, A. H. 1922. Sveriges olenidskiffer. Sveriges geologiska undersökning Ca18, 1205.
Westergård, A. H. 1936. Paradoxides œlandicus beds of Öland with the account of a diamond boring through the Cambrian at Mossberga. Sveriges geologiska undersökning C394, 166.
Westergård, A. H. 1944. Borrningar genom alunskifferlagret på Öland och i Östergötland 1943. Sveriges geologiska undersökning C463, 122.
Westergård, A. H. 1946. Agnostidea of the Middle Cambrian of Sweden. Sveriges geologiska undersökning C477, 1140.
Westergård, A. H. 1947a. Supplementary notes on the Upper Cambrian trilobites of Sweden. Sveriges geologiska undersökning C489, 134.
Westergård, A. H. 1947b. Nya data rörande alunskifferlagret på Öland. Sveriges geologiska undersökning C483, 112.
Woods, M. A., Wilby, P. R., Leng, M. J., Rushton, A. W. A. & Williams, M. 2011. The Furongian (late Cambrian) Steptoean Positive Carbon Isotope Excursion (SPICE) in Avalonia. Journal of the Geological Society, London 168, 851–61.
Wotte, T. & Strauss, H. 2015. Questioning a widespread euxinia for the Furongian (Late Cambrian) SPICE event: indications from δ13C, δ18O, δ34S and biostratigraphic constraints. Geological Magazine 152, 1085–103.
Zhu, M. Y., Babcock, L. E. & Peng, S. C. 2006. Advances in Cambrian stratigraphy and paleontology: integrating correlation techniques, paleobiology, taphonomy and paleoenvironmental reconstruction. Palaeoworld 15, 217–22.
Zhu, M. Y., Zhang, J. M., Li, G. X. & Yang, A. H. 2004. Evolution of C isotopes in the Cambrian of China: implications for Cambrian subdivision and trilobite mass extinctions. Geobios 37, 287301.



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