• Niagaran of United States (2: Indiana, Ohio collections)

• Silurian of Australia (2), Canada (23: Manitoba, New Brunswick, Northwest Territories, Nunavut, Ontario), China (3), the Czech Republic (2), the Russian Federation (4), Sweden (4), the United Kingdom (2), United States (17: Illinois, Indiana, Iowa, Michigan, Wisconsin)

• Arenig of Spain (1)

• Ordovician of Australia (16), Canada (10: Manitoba, Ontario, Québec), China (5), Kazakhstan (2), Norway (1), the Russian Federation (2), the United Kingdom (6), United States (1: Maine)

Total: 103 collections including 116 occurrences