Ordovician
General info
Belongs to
Type chronostratigraphy
Rank System
Scope global
Status formal standard
Author Lapworth
Year 1879
Etymon Ordovices, a northen Celtic Welsh tribe
Age top (Ma) 443.8
Age base (Ma) 485.4
Age (Ma)
Index
O
Alt. index
O
Date changed 2022-11-04
Stratotypes
LocalityTypeFrom (m)1To (m)2ReferenceRemarks
Green Point Section, western Newfoundland
boundary stratotype
101.8 Cooper et al., 2001 GSSP for the Tremadocian Stage