• Permian of Australia (1 collection)

• Devonian of the Czech Republic (1)

• Uhaku of Belarus (1), Sweden (4)

• Chazyan of Canada (3: Quebec), United States (5: Alabama, New York, Tennessee)

• Whiterockian of United States (1: Nevada)

• Volkhov of Estonia (3), the Russian Federation (22)

• Klabava of the Czech Republic (1)

• Arenig of United States (2: Nevada)

• Ordovician of Argentina (1), Australia (6), Canada (3: Alberta, Newfoundland, Newfoundland and Labrador), the Czech Republic (3), Estonia (19), Iran (3), Ireland (2), Kazakhstan (3), Latvia (1), Lithuania (2), Mexico (1), Norway (3), the Russian Federation (12), Sweden (15), the United Kingdom (2), United States (22: Illinois, Iowa, Maine, Minnesota, Montana, North Dakota, Ohio, Oklahoma, Tennessee, Utah, Virginia)

• Tremadoc of the Czech Republic (3), Iran (1), Poland (1), United States (2: Montana)

• Skullrockian of United States (1: Utah)

• Cambrian of the Czech Republic (1), Estonia (1), France (1), Iran (2), Kazakhstan (2), Mexico (4), United States (2: Montana, Utah)

Total: 163 collections including 180 occurrences