Linked Data Service of GSJ
Geological age
[ Ordovician ] Upper level
Ordovician
Late Ordovician
Hirnantian
445.2 ±0.9
Katian
452.8 ±0.7
Sandbian
458.2 ±0.7
Middle Ordovician
Darriwilian
469.4 ±0.9
Dapingian
471.3 ±1.4
Early Ordovician
Floian
477.7 ±1.2
Tremadocian
486.85 ±1.5