Type
Zone
Age range
424.8–423.6 Ma

International Timescale

Ludlow
Ludfordian

Conodont Zonation

Ozarkodina crispa
Ozarkodina snajdri
Polygnathoides siluricus
424.9424.8424.8424.7424.6424.6424.6424.5424.4424.4424.4424.3424.3424.2424.1424.1424.1424.0423.9423.9423.9423.8423.8423.7423.6423.6423.6

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