Investigating the carbonate-shale facies transition and deposition on the Scandinavian Ordovician Shelf – the Arnestad Formation, southern Norway
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The Upper Ordovician Arnestad Formation was located on the northwestern edge of Baltica in the region near modern day Oslo, Norway. This formation was found to be 60 m thick and consists of intercalated siliciclastic mudstones and thin, nodular carbonate beds. Six outcrops and 38 thin sections were used to describe the Arnestad Formation in detail and divide the formation into six key facies. Dark grey silicilastic mudstones dominate the succession and contain lenses of fossil fragments. Interbedded nodular carbonates are mud- to wackestones, contain lenses of fossil fragments, and often form ...