Type
Zone
Age range
425.2–424.8 Ma
Ludlow
Ludfordian
Gorstian
Ozarkodina snajdri
Polygnathoides siluricus
Ancoradella ploeckensis
425.20425.18425.16425.14425.12425.10425.08425.06425.04425.02425.00424.98424.96424.94424.92424.90424.88424.86424.84424.82424.80