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Stratigraphy
Ärina Formation
Belongs toBaltic lithostratigraphy (Ordovician)
Typelithostratigraphy
RankFormation
Scoperegional
Statusformal standard
AuthorGrigelis
Year1978
EtymonÄrina, place in central Estonia
Age (Ma)Porkuni Stage
Index
FIIÄ
Alt. index
O3är
Date changed2022-06-10
Locality
Type
From (m)
To (m)
Reference
Remarks
Ärina
holostratotype
Männil, Ralf & Rõõmusoks, 1984outcrop [boulders?], Estonia
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