• Whiterockian of United States (2: New York, Utah collections)

• Chazyan of United States (2: Vermont)

• Arenig of Argentina (2), China (9), United States (7: Oklahoma, Texas)

• Arenigian of South Korea (1), United States (6: Nevada)

• Ordovician of Argentina (2), Canada (4: Newfoundland, Newfoundland and Labrador), China (27), Malaysia (1), Norway (1), the Russian Federation (1), South Korea (3), the United Kingdom (1), United States (17: Oklahoma, Texas, Utah)

• Ibexian of United States (1: Utah)

Total: 87 collections including 88 occurrences