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Furongian (Cambrian) agnostoids of Scandinavia and their implications for intercontinental correlation

  • PER AHLBERG (a1) and FREDRIK TERFELT (a1)

Abstract

Out of the 14 agnostoid species/subspecies so far recorded from the Furongian of Scandinavia, seven are excellent biostratigraphical indices and important for correlation between Baltica and other palaeocontinents. Glyptagnostus reticulatus, Aspidagnostus lunulosus and Agnostus (Homagnostus) obesus first appear at the base of the G. reticulatus Zone, allowing a precise correlation of the base of the Paibian Stage into Scandinavia. Tomagnostella orientalis and Pseudagnostus cyclopyge appear near the base of the Parabolina brevispina Zone, suggesting a correlation with the uppermost Paibian through the lowermost Jiangshanian stages. Lotagnostus americanus and Pseudagnostus rugosus have an intercontinental distribution and their first appearance in Scandinavia allows for a correlation with one of the most favourable levels for defining the base of Cambrian provisional Stage 10. In the Furongian of Scandinavia, agnostoids are conspicuously assembled in three different intervals: the lower Glyptagnostus reticulatus Zone, the lower Pseudagnostus cyclopyge Zone and the Lotagnostus americanus through lower Trilobagnostus holmi zones. The agnostoid-barren and largely unfossiliferous succession separating the lower and middle agnostoid-bearing intervals can be explained by means of subsequent dissolution of the calcareous fauna and/or a hostile environment. The middle agnostoid-bearing interval is succeeded by an anomalous succession dominated by the orthide brachiopod Orusia lenticularis, reflecting a regressive event coupled with increasing levels of oxygen at the sediment/water interface. This shallowing evidently resulted in unfavourable conditions for agnostoids.

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Corresponding author

*Author for correspondence: per.ahlberg@geol.lu.se

References

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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. & Ahlgren, J. 1996. Agnostids from the Upper Cambrian of Västergötland, Sweden. GFF 118, 129–40.
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., Månsson, K., Clarkson, E. N. K. & Taylor, C. M. 2006. Faunal turnovers and trilobite morphologies in the upper Cambrian Leptoplastus Zone at Andrarum, southern Sweden. Lethaia 39, 97110.
Angelin, N. P. 1851. Palaeontologia Svecica. I: Iconographia crustaceorum formationis transitionis. Fasc. 1. Lund, 24 pp.
Axheimer, N. & Ahlberg, P. 2003. A core drilling through Cambrian strata at Almbacken, Skåne, S. Sweden: trilobites and stratigraphical assessment. GFF 125, 139–56.
Babcock, L. E. & Peng, S. C. 2007. Cambrian chronostratigraphy: current state and future plans. Palaeogeography, Palaeoclimatology, Palaeoecology 254, 62–6.
Babcock, L. E., Peng, S. C., Geyer, G. & Shergold, J. H. 2005. Changing perspectives on Cambrian chronostratigraphy and progress toward subdivision of the Cambrian System. Geosciences Journal 9, 101–6.
Babcock, L. E., Robison, R. A. & Peng, S. C. 2011. Cambrian stage and series nomenclature of Laurentia and the developing global chronostratigraphic scale. In Cambrian Stratigraphy and Paleontology of Northern Arizona and Southern Nevada, The 16th Field Conference of the Cambrian Stage Subdivision Working Group, International Subcommission on Cambrian Stratigraphy, Flagstaff, Arizona, and Southern Nevada, United States (eds Hollingsworth, J. S., Sundberg, F. A. & Foster, J. R.), pp. 1226. Museum of Northern Arizona Bulletin 67. Flagstaff, Arizona: Museum of Northern Arizona.
Belt, T. 1867. On some new trilobites from the Upper Cambrian rocks of North Wales. Geological Magazine 4, 294–5.
Billings, E. 1860. On some new species of fossils from the limestone near Point Levi, opposite Quebec. Canadian Naturalist and Geologist 5, 301–24.
Borovikov, L. I. & Kryskov, L. N. 1963. Cambrian deposits of the Kendyktas Mountains (southern Kazakhstan). National Geological Committee of the U.S.S.R., Transactions of the All-Union Scientific Research Institute of Geology (VSEGEI), New Series 94, 266–80. (In Russian).
Buchardt, B., Nielsen, A. T. & Schovsbo, N. H. 1997. Alun Skiferen i Skandinavien. Geologisk Tidsskrift 1997 (3), 130.
Chatterton, B. D. E., Collins, D. H. & Ludvigsen, R. 2003. Cryptic behaviour in trilobites: Cambrian and Silurian examples from Canada, and other related occurrences. Special Papers in Palaeontology 70, 157–73.
Choi, D. K., Lee, J. G. & Sheen, B. C. 2004. Upper Cambrian agnostoid trilobites from the Machari Formation, Yongwol, Korea. Geobios 37, 159–89.
Clarkson, E. N. K., Ahlberg, P. & Taylor, C. M. 1998. Faunal dynamics and microevolutionary investigations in the Upper Cambrian Olenus Zone at Andrarum, Skåne, Sweden. GFF 120, 257–67.
Cocks, L. R. M. & Torsvik, T. H. 2002. Earth geography from 500 to 400 million years ago: a faunal and palaeomagnetic review. Journal of the Geological Society, London 159, 631–44.
Cocks, L. R. 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.
Dworatzek, M. 1987. Sedimentology and petrology of carbonate intercalations in the Upper Cambrian Olenid shale facies of southern Sweden. Sveriges Geologiska Undersökning C819, 173.
Ergaliev, G. K. 1980. Middle and Upper Cambrian Trilobites of the Lesser Karatau. Alma-Ata: Academy of Sciences, Kazakhstan SSR, Kazakhstan SSR Publishing House, 211 pp. (in Russian).
Ergaliev, G. K. & Ergaliev, F. G. 2008. Middle and Upper Cambrian Agnostida of the Aksai National Geological Reserve South Kazakhstan (Kyrshabakty River, Malyi Karatau Range). Almaty: Gylum, 376 pp. (in Russian with English abstract, introduction and figure captions).
Eriksson, M. E. & Terfelt, F. 2007. Anomalous facies and ancient faeces in the latest middle Cambrian of Sweden. Lethaia 40, 6984.
Erlström, M., Thomas, S. A., Deeks, N. & Sivhed, U. 1997: Structure and tectonic evolution of the Tornquist Zone and adjacent sedimentary basins in Scania and the southern Baltic Sea. Tectonophysics 271, 191215.
Fatka, O. & Szabad, M. 2011. Agnostids entombed under exoskeletons of paradoxidid trilobites. Neues Jahrbuch für Geologie und Paläontologie – Abhandlungen 259, 207–15.
Fatka, O., Vokáč, V., Moravec, J., Šinágl, M. & Valent, M. 2009. Agnostids entombed in hyolith conchs. Memoirs of the Association of Australasian Palaeontologists 37, 481–9.
Gee, D. G. 1972. The regional geological context of the Tåsjö Uranium Project, Caledonian Front, central Sweden. Sveriges Geologiska Undersökning C671, 136.
Geyer, G. & Shergold, J. 2000: The quest for internationally recognized divisions of Cambrian time. Episodes 23, 188–95.
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.
Hall, J. & Whitfield, R. P. 1877. Paleontology, Pt. II, Fossils of the Potsdam Group. In Report of the United States Geological Exploration of the Fortieth Parallel, Vol. 4 (ed. King, C.), pp. 198302. United States Army Engineer Department Professional Papers 18.
Havlíček, V., Vaněk, J. & Fatka, O. 1993. Floating algae of the genus Krejciella as probable hosts of epiplanktic organisms (Dobrotivá Series, Ordovician; Prague Basin). Journal of the Czech Geological Society 38, 7988.
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 VidenskapsAkademi i Oslo, I. MatematiskNaturvidenskapelig Klasse 1957 (1), 1303.
Henningsmoen, G. 1958. The Upper Cambrian faunas of Norway with descriptions of non-olenid invertebrate fossils. Norsk Geologisk Tidsskrift 38, 179–96.
Ivshin, N. K. 1962. Upper Cambrian Trilobites of Kazakhstan, Part 2. Alma-Ata: Institute of Geological Sciences, Publishing House of the Academy of Sciences of the Kazakh SSR, 412 pp. (in Russian).
Jaekel, O. 1909. Über die Agnostiden. Zeitschrift der Deutschen Geologischen Gesellschaft 61, 380401.
Jago, J. B. 1973. Cambrian agnostid communities in Tasmania. Lethaia 6, 405–21.
Kobayashi, T. 1935. The Cambro-Ordovician formations and faunas of South Chosen, Palaeontology, Pt. III, Cambrian faunas of South Chosen with a special study on the Cambrian trilobite genera and families. Journal of the Faculty of Science, Imperial University of Tokyo, Section II 4 (2), 49344.
Lauridsen, B. W. & Nielsen, A. T. 2005. The Upper Cambrian trilobite Olenus at Andrarum, Sweden: a case study of iterative evolution? Palaeontology 48, 1041–56.
Lazarenko, N. P. 1966. Biostratigraphy and some new Upper Cambrian trilobites from the Olenek Uplift and Kharaulakh Mountains. Ucheniye zapiski. Paleontologiya i biostratigrafiya. Nauchno-Issledovateliskii Institut geologii Arktiki 11, 3378 (in Russian).
Lazarenko, N. P., Gogin, I. Ya., Pegel, T. V., Sukhov, S. S., Abaimova, G. P., Egorova, L. I., Fedorov, A. B., Raevskaya, E. G. & Ushatinskaya, G. T. 2008. Excursion 1b. Cambrian stratigraphy of the northeastern Siberian Platform and potential stratotypes of lower boundaries of the proposed Upper Cambrian Chekurovkian and Nelegerian stages in the Ogon'or Formation section at the Khos-Nelege River; the boundaries are defined by the FAD of Agnostotes orientalis and Lotagnostus americanus . In The Cambrian System of the Siberian Platform. Part 2: North-east of the Siberian Platform (eds Rozanov, A. Yu. & Varlamov, A. I.), pp. 61139. Moscow and Novosibirsk: PIN RAS, 139 pp.
Lermontova, E. V. 1940. Trilobita. In Atlas of the Leading Forms of the Fossil Faunas of the USSR. 1. Cambrian (ed. Vologdin, A. G.), pp. 112–57. Moscow and Leningrad: All-Union Scientific Research Institute (VSEGEI), State Publishing House of Geological Literature (in Russian).
Linnarsson, J. G. O. 1869. Om Vestergötlands cambriska och siluriska aflagringar. Kongliga Svenska Vetenskaps-Akademiens Handlingar 8 (2), 189.
Maas, A., Waloszek, D. & Müller, K. J. 2003. Morphology, ontogeny and phylogeny of the Phosphatocopina (Crustacea) from the Upper Cambrian ‘Orsten’ of Sweden. Fossils and Strata 49, 1238.
Martin, F. & Dean, W. T. 1988. Middle and Upper Cambrian acritarchs and trilobite zonation at Manuels River and Random Island, eastern Newfoundland. Geological Survey of Canada Bulletin 381, 191.
Morris, S. F. 1988. A review of British trilobites, including a synoptic revision of Salter's monograph. Monographs of the Palaeontographical Society 140, 1316.
Müller, K. J. & Hintz, I. 1991. Upper Cambrian conodonts from Sweden. Fossils and Strata 28, 1153.
Müller, K. J. & Walossek, D. 1985. A remarkable arthropod fauna from the Upper Cambrian ‘Orsten’ of Sweden. Transactions of the Royal Society of Edinburgh: Earth Sciences 76, 161–72.
Müller, K. J. & Walossek, D. 1987. Morphology, ontogeny, and life habit of Agnostus pisiformis from the Upper Cambrian of Sweden. Fossils and Strata 19, 1124.
Nielsen, A. T. & Schovsbo, N. H. 2007. Cambrian to basal Ordovician lithostratigraphy in southern Scandinavia. Bulletin of the Geological Society of Denmark 53, 4792.
Nikolaisen, F. & Henningsmoen, G. 1985. Upper Cambrian and lower Tremadoc olenid trilobites from the Digermul peninsula, Finnmark, northern Norway. Norges Geologiske Undersøkelse, Bulletin 400, 149.
Norling, E. & Bergström, J. 1987. Mesozoic and Cenozoic tectonic evolution of Scania, southern Sweden. Tectonophysics 137, 719.
Öpik, A. A. 1961. The geology and palaeontology of the headwaters of the Burke River, Queensland. Bureau of Mineral Resources, Geology and Geophysics, Bulletin 53, 1249.
Öpik, A. A. 1967. The Mindyallan fauna of north-western Queensland. Bureau of Mineral Resources, Geology and Geophysics, Bulletin 74, 1404.
Öpik, A. A. 1979. Middle Cambrian agnostids: systematics and biostratigraphy. Bureau of Mineral Resources, Geology and Geophysics, Bulletin 172, 1188.
Palmer, A. R. 1962. Glyptagnostus and associated trilobites in the United States. United States Geological Survey Professional Paper 374-F, 149.
Pek, I. 1977. Agnostid trilobites of the Central Bohemian Ordovician. Sborník geologických věd, Paleontologie 19, 744.
Peng, S. C. & Babcock, L. E. 2005. Two Cambrian agnostoid trilobites, Agnostotes orientalis (Kobayashi, 1935) and Lotagnostus americanus (Billings, 1860): Key species for defining global stages of the Cambrian System. Geosciences Journal 9, 107–15.
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.
Peng, S. C., Babcock, L. E., Zuo, J. X., Lin, H. L., Zhu, X. J., Yang, X. F., Qi, Y. P., Bagnoli, G. & Wang, L. W. 2009 a. Proposed GSSP for the base of Cambrian Stage 9, coinciding with the first appearance of Agnostotes orientalis, at Duibian, Zhejiang, China. Science in China Series D: Earth Sciences 52, 434–51.
Peng, S. C., Hughes, N. C., Heim, N. A., Sell, B. K., Zhu, X. J., Myrow, P. M. & Parcha, S. K. 2009 b. Cambrian trilobites from the Parahio and Zanskar valleys, Indian Himalaya. Paleontological Society Memoir 71, 195.
Peng, S. C. & Robison, R. A. 2000. Agnostoid biostratigraphy across the Middle–Upper Cambrian boundary in Hunan, China. Paleontological Society Memoir 53, 1104.
Pratt, B. R. 1992. Trilobites of the Marjuman and Steptoean stages (Upper Cambrian), Rabbitkettle Formation, southern Mackenzie Mountains, northwest Canada. Palaeontographica Canadiana 9, 1179.
Reading, H. G. 1965. Eocambrian and Lower Palaeozoic geology of the Digermul Peninsula, Tanafjord, Finnmark. Norges Geologiske Undersøkelse 234, 167–91.
Robison, R. A. 1972. Mode of life of agnostid trilobites. International Geological Congress 24, Montreal, Canada, Section 7, 33–40.
Robison, R. A. 1976. Middle Cambrian trilobite biostratigraphy of the Great Basin. Brigham Young University Geology Studies 23, 93109.
Rushton, A. W. A. 1982. The biostratigraphy and correlation of the Merioneth-Tremadoc Series boundary in North Wales. In The Cambrian-Ordovician Boundary: Sections, Fossil Distributions, and Correlations (eds Bassett, M. G. & Dean, W. T.), pp. 4159. Cardiff: National Museum of Wales, Geological Series 3.
Rushton, A. W. A. 1983. Trilobites from the Upper Cambrian Olenus Zone in central England. Special Papers in Palaeontology 30, 107–39.
Rushton, A. W. A. 2009. Revision of the Furongian agnostoid Lotagnostus trisectus (Salter). Memoirs of the Association of Australasian Palaeontologists 37, 273–9.
Rushton, A. W. A. & Weidner, T. 2010. The Furongian trilobite Irvingella from Jämtland and Ångermanland, Sweden. GFF 132, 193200.
Salter, J. W. 1864. Trilobites (chiefly Silurian). Figures and descriptions illustrative of British organic remains. Memoirs of the Geological Survey of the United Kingdom, London, Decade 11, 64 pp.
Saltzman, M. R., Young, S. A., Kump, L. R., Gill, B. C., Lyons, T. W. & Runnegar, B. 2011. Pulse of atmospheric oxygen during the late Cambrian. Proceedings of the National Academy of Sciences 108, 3876–81.
Schovsbo, N. H. 2001. Why barren intervals? A taphonomic case study of the Scandinavian alum shale and its faunas. Lethaia 34, 271–85.
Shergold, J. H. & Webers, G. F. 1992. Late Dresbachian (Idamean) and other trilobite faunas from the Heritage Range, Ellsworth Mountains, West Antarctica. In Geology and Paleontology of the Ellsworth Mountains, West Antarctica, (eds Webers, G. F., Craddock, C. & Splettstoesser, J. F.), pp. 125–68. Geological Society of America Memoir 170.
Stitt, J. H. & Perfetta, P. J. 2000. Trilobites, biostratigraphy, and lithostratigraphy of the Crepicephalus and Aphelaspis zones, lower Deadwood Formation (Marjuman and Steptoean stages, Upper Cambrian), Black Hills, South Dakota. Journal of Paleontology 74, 199223.
Szaniawski, H. & Bengtson, S. 1998. Late Cambrian euconodonts from Sweden. Palaeontologica Polonica 58, 729.
Terfelt, F. & Ahlberg, P. 2010. Pseudagnostus rugosus Ergaliev, 1980: a key agnostoid species for intercontinental correlation of upper Furongian (Cambrian) strata. Geological Magazine 147, 789–96.
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., Ahlberg, P., Eriksson, M. E. & Clarkson, E. N. K. 2005. Furongian (upper Cambrian) biostratigraphy and trilobites of the Håslöv-1 drill core, Scania, S. Sweden. GFF 127, 195203.
Terfelt, F. & Ahlgren, J. 2007. Macropyge (Promacropyge) scandinavica new species; the first macropyginid trilobite recorded from the Fuongian of Baltica. Journal of Paleontology 81, 1516–22.
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.
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, 321–29.
Tullberg, S. A. 1880. Om Agnostus-arterna i de kambriska aflagringarne vid Andrarum. Sveriges Geologiska Undersökning C42, 138.
Weidner, T. 1997. Fund des Trilobiten Aspidagnostus cf. stictus Öpik 1967 in einem oberkambrischen Stinkkalk-Geschiebe. Der Geschiebesammler 30, 119–20.
Westergård, A. H. 1909. Studier öfver Dictyograptusskiffern och dess gränslager med särskild hänsyn till i Skåne förekommande bildningar. Lunds Universitets Årsskrift, N.F. 2 (5), 179.
Westergård, A. H. 1922. Sveriges olenidskiffer. Sveriges Geologiska Undersökning Ca18, 1205.
Westergård, A. H. 1944. Borrningar genom Skånes alunskiffer 1941–42. Sveriges Geologiska Undersökning C459, 145.
Westergård, A. H. 1946. Agnostidea of the Middle Cambrian of Sweden. Sveriges Geologiska Undersökning C477, 1140.
Westergård, A. H. 1947. Supplementary notes on the Upper Cambrian trilobites of Sweden. Sveriges Geologiska Undersökning C489, 134.
Żylińska, A. 2001. Late Cambrian trilobites from the Holy Cross Mountains, central Poland. Acta Geologica Polonica 51, 333–83.

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