Type
Zone
Age range
431.2–430.6 Ma
Wenlock
Homerian
Sheinwoodian
Ozarkodina sagitta sagitta
Kockelella ortus ortus
Kockelella walliseri
431.20431.15431.10431.05431.00430.95430.90430.85430.80430.75430.70430.65430.60