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Jüri Martna. (1955) Studies on the Macrourus and Slandrom Formations I Shell Fragment Frequencies of the Macrourus Formation and Adjacent Strata at Fjäcka. Gräsgård, and File Haidar. Geologiska Föreningen i Stockholm Förhandlingar 77:3, pages 229-256.
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Valdar Jaanusson & Isles Strachan. (1954) Correlation of the Scandinavian Middle Ordovician with the graptolite succession. Geologiska Föreningen i Stockholm Förhandlingar 76:4, pages 684-696.
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Arne Thorshøj Nielsen, Per Ahlberg, Jan Ove R. Ebbestad, Øyvind Hammer, David Alexander Taylor Harper, Anders Lindskog, Christian Mac Ørum Rasmussen & Svend Stouge. (2023) The Ordovician of Scandinavia: a revised regional stage classification. Geological Society, London, Special Publications 532:1, pages 267-315.
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