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Stratigraphy
Fjäcka Formation
Belongs toBaltic lithostratigraphy (Ordovician)
Typelithostratigraphy
RankFormation
Scoperegional
Statusformal standard
AuthorJaanusson
Year1963
Age (Ma)Vormsi Stage
Index
FIbF
Alt. index
O3fj
Date added2009-10-02
Date changed2022-12-01
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