Ristna Substage
General info
Belongs to
Keila Stage
Type chronostratigraphy
Rank Substage
Scope regional
Status informal standard
Author Jaanusson
Year 1945
Age (Ma)
Upper Ordovician
Index
DIIα
Date changed 2012-01-06
References (1)Specimens (6)Samples (1)
ReferenceContentYear1PagesRemarks
Jaanusson, 1945
1945
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