Type
Zone
Age range
422.7–421.2 Ma

International Timescale

Pridoli
Ludlow
Ludfordian

Conodont Zonation

Oulodus elegans detortus
Ozarkodina eosteinhornensis
Ozarkodina crispa
422.7422.6422.5422.4422.3422.2422.1422.0421.9421.8421.7421.6421.5421.4421.3421.2

Macrostrat

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