Type
Zone
Age range
467.4–464.4 Ma

International Timescale

Middle Ordovician
Darriwilian

Conodont Zonation

Histiodella holodentata
Histiodella sinuosa
Histiodella altifrons
467.4467.2467.0466.8466.6466.4466.2466.0465.8465.6465.4465.2465.0464.8464.6464.4

Macrostrat

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