Lexicon
Intervals
Macrostrat
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Blackriverian
166
Type
Age
Age range
458.2–456.5
Ma
International Timescale
Late Ordovician
Sandbian
Middle Ordovician
Darriwilian
Custom COSUNA
Rocklandian-Shermanian
Blackriverian
Llandeilo
COSUNA
Rocklandian
Whiterock
Blackriverian
Chazyan
458.2
458.1
458.0
457.9
457.8
457.7
457.6
457.5
457.4
457.3
457.2
457.1
457.0
456.9
456.8
456.7
456.6
456.5
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