• Chazyan of United States (4: Alabama, Tennessee collections)

• Whiterockian of United States (4: Nevada, Utah)

• Volkhov of Estonia (5), the Russian Federation (60)

• Vaana of Estonia (1)

• Arenig of Argentina (8), Canada (1: New Brunswick), China (27), Greenland (1), the United Kingdom (1), United States (1: Nevada)

• Dawan of China (6)

• Arenigian of Argentina (4), United States (1: Nevada)

• Ordovician of Argentina (3), Australia (13), Canada (12: Alberta, Newfoundland, Newfoundland and Labrador, Quebec), China (23), Estonia (3), Iran (4), Ireland (1), Kazakhstan (19), Norway (3), the Russian Federation (25), Sweden (5), the United Kingdom (2), United States (29: Alabama, Arkansas, Idaho, Maine, Missouri, Nevada, Oklahoma, Tennessee, Utah)

• Canadian of Canada (4: Northwest Territories), United States (1: Maryland)

• Tremadoc of Argentina (3), China (13), the Czech Republic (4), Iran (8)

• Ibexian of United States (2: Nevada)

Total: 301 collections including 383 occurrences