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  • [1] Ainsaar, L, Kaljo, D, Martma, T, Meidla, T, Männik, P, Nolvak, J and Tinn, O (2010). Middle and Upper Ordovician carbon isotope chemostratigraphy in Baltoscandia: a correlation standard and clues to environmental history. Palaeogeography, Palaeoclimatology, Palaeoecology 294, 198–201.

  • [2] Ellinor Martin, Birger Schmitz, Hans‐Peter Schönlaub. From the mid‐Ordovician into the Late Silurian: Changes in the micrometeorite flux after the L chondrite parent breakup. Meteoritics & Planetary Science Volume 53, Issue 12, December 2018, Pages 2541-2557

  • [3] Anders Lindskog, Mats E. Eriksson, Carsten Tell, Fredrik Terfelt, Ellinor Martin, Per Ahlberg, Birger Schmitz, Federica Marone. Mollusk maxima and marine events in the Middle Ordovician of Baltoscandia. Palaeogeography, Palaeoclimatology, Palaeoecology Volume 440, 15 December 2015, Pages 53-65. https://doi.org/10.1016/j.palaeo.2015.08.018

  • [4] Christian M. Ø. Rasmussen, Arne T. Nielsen, David A. T. Harper (2009). Ecostratigraphical interpretation of lower Middle Ordovician East Baltic sections based on brachiopods. Geological Magazine 146 (5): 717–731. https://doi.org/10.1017/S0016756809990148

  • [5] Alroy, J. (2010). The shifting balance of diversity among major marine animal groups. Science 329, 1191–994.

  • [6] Rasmussen, C., Ullmann, C., Jakobsen, K. et al. Onset of main Phanerozoic marine radiation sparked by emerging Mid Ordovician icehouse. Sci Rep 6, 18884 (2016). https://doi.org/10.1038/srep18884

  • [7] L. Robin M. Cocks, Trond H. Torsvik. Ordovician palaeogeography and climate change. Gondwana Research, 24 October 2020. https://doi.org/10.1016/j.gr.2020.09.008

  • [8] Helje Pärnaste, Jan Bergström, Zhou Zhiyi (2012). High resolution trilobite stratigraphy of the Lower–Middle Ordovician Öland Series of Baltoscandia. Geological Magazine 150 (3): 509–518. https://doi.org/10.1017/S0016756812000908

  • [9] Helje Pärnaste, Jan Bergström (2013). The asaphid trilobite fauna: Its rise and fall in Baltica. Palaeogeography, Palaeoclimatology, Palaeoecology 389, pages 64-77.

  • [10] Martin Stein & Jan Bergström (2010). Some lower Middle Ordovician species of Asaphus (Trilobita) from Sweden. GFF, 132: 2, 105-116, DOI: 10.1080/11035897.2010.486478

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