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Synopsis. New fossil collections and field work in all parts of the Oslo Region in rocks of middle and late Llandovery and early Wenlock ages have led to a reassessment of the stratigraphical units, including the erection of a new Porsgrunn Formation of late Llandovery age in the Skien, Porsgrunn and Holmestrand districts. The fossils used for dating are reviewed in turn, with new graptolite records and new finds recorded of the age-diagnostic brachiopod Eocoelia sulcata. Many faunaldoi:10.5962/p.313804 fatcat:nbualv4kdjgcjhmdna5doh5nza