, Volume 51, Issue 1–4, pp 584–591 | Cite as

Silurian carbonate platforms and extinction events—ecosystem changes exemplified from Gotland, Sweden

Original Article


Recent and ancient carbonate platforms are major marine ecosystems, built by various carbonate-secreting organisms with different sensitivity for environmental change. For this reason, carbonate platforms are excellent sensors for changes in contemporaneous marine environments. A variety of ecosystem changes in carbonate platforms have previously been recognised in the aftermath of mass extinction events. This paper addresses how two Silurian extinction events among graptolites, conodonts, and pentamerid brachiopods can be related to changes in the style of carbonate production and general evolution of low latitude carbonate platforms in a similar way as previously reported from the major five mass extinctions of the Phanerozoic. Strata formed on Gotland during the Mulde and Lau events share remarkably many similarities but are strikingly different in composition compared to other strata on the island. The event-related strata is characterised by the sudden appearance of widespread oolites, deviating reef composition, flat-pebble conglomerates, abundant micro- and macro-oncoids, stromatolites, and other microbial facies suggesting decreased bioturbation levels in contemporaneous shelf seas. Importantly, these changes can be tied to high-resolution biostratigraphic frameworks and global stable isotope excursions. The anomalous intervals may therefore be searched for elsewhere in order to test their regional or global significance.


Carbonate platform Extinction event Microbial resurgence Oolite Gotland Silurian 


  1. Baarli BG, Johnson ME, Antoshkina AI (2003) Silurian stratigraphy and palaeogeography of Baltica. In: Landing E, Johnson ME (eds) Silurian lands and seas—paleogeography outside of Laurentia. New York State Mus Bull 493:3–34Google Scholar
  2. Bickert T, Pätzold J, Samtleben C, Munnecke A (1997) Paleoenvironmental changes in the Silurian indicated by stable isotopes in brachiopod shells from Gotland, Sweden. Geochim Cosmochim Acta 61:2717–2730CrossRefGoogle Scholar
  3. Boucot AJ (1991) Developments in Silurian studies since 1839. In: Bassett MG, Lane PD, Edwards D (eds) The Murchison Symposium. Spec Pap Palaeontol 44:91–107Google Scholar
  4. Calner M (1999) Stratigraphy, facies development, and depositional dynamics of the Late Wenlock Fröjel Formation, Gotland, Sweden. GFF 121:13–24Google Scholar
  5. Calner M (2002) A lowstand epikarstic intertidal flat from the middle Silurian of Gotland, Sweden. Sediment Geol 148:389–403CrossRefGoogle Scholar
  6. Calner M (2005) A Late Silurian extinction event and anachronistic period. Geology 33:305–308CrossRefGoogle Scholar
  7. Calner M, Jeppsson L (2003) Carbonate platform evolution and conodont stratigraphy during the middle Silurian Mulde Event, Gotland, Sweden. Geol Mag 140:173–203CrossRefGoogle Scholar
  8. Calner M, Säll E (1999) Transgressive oolites onlapping a Silurian rocky shoreline unconformity, Gotland, Sweden. GFF 121:91–100Google Scholar
  9. Calner M, Sandström O, Mõtus A-M (2000) Significance of a halysitid–heliolitid mud-facies autobiostrome from the Middle Silurian of Gotland, Sweden. Palaios 15:509–521Google Scholar
  10. Calner M, Jeppsson L, Eriksson MJ (2004a) Ytterholmen revisited—implications for the Late Wenlock stratigraphy of Gotland and coeval extinctions. GFF 126:231–241Google Scholar
  11. Calner M, Jeppsson L, Munnecke A (2004b) The Silurian of Gotland—Part I. Review of the stratigraphic framework, event stratigraphy, and stable carbon and oxygen isotope development. In: Munnecke A, Servais T, Schulbert C (eds) Early Palaeozoic palaeogeography and palaeoclimate (IGCP 503). Erlanger Geol Abh Sonderbd 5:113–131Google Scholar
  12. Calner M, Kozłowska-Dawidziuk A, Masiak M (2004c) Correlation of the middle Silurian graptolite crisis and coeval laminated sediments across the Baltic Shield and East European Platform. In: Munnecke A, Servais T, Schulbert C (eds) Early Palaeozoic palaeogeography and palaeoclimate (IGCP 503). Erlanger Geol Abh Sonderbd 5:25–26Google Scholar
  13. Cherns L (1982) Palaeokarst, tidal erosion surfaces and stromatolites in the Silurian Eke formation of Gotland, Sweden. Sedimentology 29:819–833Google Scholar
  14. Grotzinger JP, Knoll AH (1995) Anomalous carbonate precipitates: is the Precambrian the key to the Permian? Palaios 10:578–596PubMedGoogle Scholar
  15. Groves JR, Calner M (2004) Lower Triassic oolites in Tethys: a sedimentologic response to the end-Permian mass extinction. Geol Soc Am Annual Meeting, Denver 2004, Abstr with Progr 36:336Google Scholar
  16. Hagadorn, JW, Bottjer DJ (1997) Wrinkle structures: microbially mediated sedimentary structures common in subtidal siliciclastic settings at the Proterozoic–Phanerozoic transition. Geology 25:1047–1050Google Scholar
  17. Hagadorn JW, Bottjer DJ (1999) Restriction of a late Neoproterozoic biotope: suspect-microbial structures and trace fossils at the Vendian-Cambrian transition. Palaios 14:73–85Google Scholar
  18. Hallock P, Hine AC, Vargo GA, Elrod JA, Jaap WC (1988) Platforms of the Nicaraguan rise: Examples of the sensivity of carbonate sedimentation to excess trophic resources. Geology 16:1104–1107CrossRefGoogle Scholar
  19. Hede JE (1925) Gottlands silurstratigrafi. Sve Geol Undersök C 305:1–100Google Scholar
  20. Jaeger H (1991) New standard graptolite zonal sequence after the “big crisis” at the Wenlockian/Ludlovian boundary (Silurian). N Jb Geol Paläont Abh 182:303–354Google Scholar
  21. Jeppsson L (1990) An oceanic model for lithological and faunal changes tested on the Silurian record. J Geol Soc London 147:663–674Google Scholar
  22. Jeppsson L (1997) The anatomy of the mid-early Silurian Ireviken Event. In: Brett C, Baird GC (eds) Paleontological events: stratigraphic, ecological, and evolutionary implications. Columbia University Press, New York, pp 451–492Google Scholar
  23. Jeppsson L, Aldridge RJ (2000) Ludlow (late Silurian) oceanic episodes and events. J Geol Soc London 157:1137–1148Google Scholar
  24. Jeppsson L, Calner M (2003) The Silurian Mulde event and a scenario for secundo–secundo events. Trans Roy Soc Edinburgh, Earth Sci 93:135–154Google Scholar
  25. Jeppsson L, Aldridge RJ, Dorning KJ (1995) Wenlock (Silurian) oceanic episodes and events. J Geol Soc London 152:487–498Google Scholar
  26. Kaljo D, Kiipli T, Martma T (1997) Correlation of carbon isotope event markers through the Wenlock-Pridoli sequence at Ohesaare (Estonia) and Priekule (Latvia). Palaeogeogr Palaeoclimatol Palaeoecol 132:211–223CrossRefGoogle Scholar
  27. Kaljo D, Martma T, Männik P, Viira V (2003) Implications of Gondwana glaciations in the Baltic late Ordovician and Silurian and a carbon isotopic test of environmental cyclicity. Bull Soc Geol France 174:59–66CrossRefGoogle Scholar
  28. Kaljo D, Brazauskas A, Kaminskas D, Martma T, Musteikis P (2004) The Ludfordian carbon isotope excursion in the Vidukle core, Lithuania, its relations with the Lau Oceanic event and environmental background in NW Baltica. Ber Inst Erdwiss Univ Graz 8:60–62Google Scholar
  29. Klaamann E, Einasto R (1977) Coral reefs of Baltic Silurian (structure, facies relations). In: Kaljo D, Einasto R (eds) Ecostratigraphy of the East Baltic. Acad Sci Estonian Inst Geol, pp 35–41Google Scholar
  30. Koren’ TN (1991) The lundgreni extinction event in central Asia and its bearing on graptolite biochronology within the Homerian. Proceedings of the Estonian Academy of Sciences. Geology 40:74–78Google Scholar
  31. Kozłowski W (2003) Age, sedimentary environment and palaeogeographical position of the late Silurian oolitic beds in the Holy Cross Mountains (Central Poland). Acta Geol Pol 53:341–357Google Scholar
  32. Lehnert O, Fryda J, Buggisch W, Manda S (2003) A first report of the Ludlow Lau event from the Prague Basin (Barrandian, Czech Republic). In: Ortega G, Aceñolaza GF (eds) Proceedings of the 7th International Graptolite Conference and Field Meeting of the International Subcommission on Silurian Stratigraphy: Tucumán 2003, Serie Correlación Geológica, vol 18, pp 139–144Google Scholar
  33. Lenz AC, Kozłowska-Dawidziuk A (2001) Upper Wenlock (Silurian) graptolites of the Arctic Canada: pre-extinction, lundgreni Biozone fauna. Palaeontogr Can 20:1–61Google Scholar
  34. Long DGF (1993) The Burgsvik Beds, an upper Silurian storm generated sand ridge complex in southern Gotland, Sweden. Geol Fören Stockholm Förh 115:299–309Google Scholar
  35. Manten AA (1971) Silurian reefs of Gotland. Dev Sedimentol 13, 539 ppGoogle Scholar
  36. Mori K (1968) Stromatoporoids from the Silurian of Gotland, I. Stockholm Contrib Geol 19:1–100Google Scholar
  37. Mori K (1970) Stromatoporoids from the Silurian of Gotland, II. Stockholm Contrib Geol 22:1–152Google Scholar
  38. Munnecke A, Samtleben C, Servais T, Vachard D (1999) SEM-observation of calcareous micro- and nannofossils incertae sedis from the Silurian of Gotland, Sweden: preliminary results. Geobios 32:307–314CrossRefGoogle Scholar
  39. Munnecke A, Samtleben C, Bickert T (2003) The Ireviken event in the lower Silurian of Gotland, Sweden— relation to similar Palaeozoic and Proterozoic events. Palaeogeogr Palaeoclimatol Palaeoecol 195:99–124CrossRefGoogle Scholar
  40. Pharaoh TC (1999) Palaeozoic terranes and their lithospheric boundaries within the trans-European Suture Zone (TESZ): a review. Tectonophysics 314:17–41CrossRefGoogle Scholar
  41. Põldvere A. (2003) Ruhnu (500) drill core. Estonian Geol Sect 5:1–76Google Scholar
  42. Poprawa P, Sliaupa S, Stephenson R, Lazauskiene J (1999) Late Vendian–early Palaeozoic tectonic evolution of the Baltic Basin: regional tectonic implications from subsidence analysis. Tectonophysics 314:219–239CrossRefGoogle Scholar
  43. Porębska E, Kozłowska-Dawidziuk A, Masiak M (2004) The lundgreni event in the Silurian of the east European Platform, Poland. Palaeogeogr Palaeoclimatol Palaeoecol 213:271–294CrossRefGoogle Scholar
  44. Pruss S, Fraiser M, Bottjer DJ (2004) Proliferation of early Triassic wrinkle structures: implications for environmental stress following the end-Permian mass extinction. Geology 32:461–464CrossRefGoogle Scholar
  45. Saltzman MR (2001) Silurian δ13C stratigraphy: a view from North America. Geology 29:671–674CrossRefGoogle Scholar
  46. Samtleben C, Munnecke A, Bickert T, Pätzold J (1996) The Silurian of Gotland (Sweden): facies interpretation based on stable isotopes in brachiopod shells. Geol Rdsch 85:278–292CrossRefGoogle Scholar
  47. Samtleben C, Munnecke A, Bickert T (2000) Development of facies and C/O-isotopes in transects through the Ludlow of Gotland: evidence for global and local influences on a shallow-marine environment. Facies 43:1–38Google Scholar
  48. Schlager W (1991) Depositional bias and environmental change— important factors in sequence stratigraphy. Sediment Geol 70:109–130CrossRefGoogle Scholar
  49. Schlager W, Reijmer JJG, Droxler A (1994) Highstand shedding of carbonate platforms. J Sediment Res B 64:270–281Google Scholar
  50. Schubert JK, Bottjer DJ, (1992) Early Triassic stromatolites as post-mass extinction disaster forms. Geology 20:883–886CrossRefGoogle Scholar
  51. Sepkoski JJ Jr (1982) Flat-pebble conglomerates, storm deposits, and the Cambrian bottom fauna. In: Einsele G, Seilacher A (eds) Cyclic and event stratification. Springer, Berlin Heidelberg New York, pp 371–385Google Scholar
  52. Sepkoski JJ Jr, Bambach RK, Droser ML (1991) Secular changes in Phanerozoic event bedding and the biological overprint. In: Einsele G, Ricken W, Seilacher A (eds) Cycles and events in stratigraphy. Springer, Berlin Heidelberg New York, pp 298–312Google Scholar
  53. Sheehan PM, Harris MT (2004) Microbialite resurgence after the late Ordovician extinction. Nature 430:75–77CrossRefPubMedGoogle Scholar
  54. Stel JH, de Coo JCM (1977) The Silurian upper Burgsvik and lower Hamra-Sundre Beds, Gotland. Scripta Geol 44:1–43Google Scholar
  55. Talent JA, Mawson R, Andrew AS, Hamilton PJ, Whitford DJ (1993) Middle Palaeozoic extinction events: faunal and isotopic data. Palaeogeogr Palaeoclimatol Palaeoecol 104:139–152CrossRefGoogle Scholar
  56. Whalen MT, Day J, Eberli GP, Homewood PW (2002) Microbial carbonates as indicators of environmental change and biotic crises in carbonate systems: examples from the late Devonian, Alberta basin, Canada. Palaeogeogr Palaeoclimatol Palaeoecol 181:127–151CrossRefGoogle Scholar
  57. Wigforss-Lange J (1999) Carbon isotope δ13C enrichment in upper Silurian (Withcliffian) marine calcareous rocks in Scania, Sweden. GFF 121:273–279Google Scholar
  58. Woods AD, Bottjer DJ, Mutti M, Morrison J (1999) Lower Triassic large sea-floor carbonate cements: their origin and a mechanism for the prolonged biotic recovery from the end-Permian mass extinction. Geology 27:645–648CrossRefGoogle Scholar

Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  1. 1.GeoBiosphere Science CentreLund UniversityLundSweden

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