• Eocene of United States (1: Wyoming collection)

• Permian of Bosnia and Herzegovina (2), China (1), Pakistan (2)

• Virgilian of United States (1: Texas)

• Desmoinesian of United States (1: Texas)

• Carboniferous of Belgium (1), United States (1: Kentucky)

• Devonian of Australia (3), Austria (3), Brazil (1), Canada (1: Northwest Territories), the Czech Republic (1), Kazakhstan (1), the United Kingdom (2), United States (7: Alaska, Maine, New York)

• Litenschichten of the Czech Republic (1)

• Silurian of Australia (1), Canada (18: Nunavut, Ontario, Quebec, Québec), the Czech Republic (13), Estonia (4), Greenland (7), Norway (2), Sweden (20), the United Kingdom (5), United States (17: Illinois, Indiana, Iowa, New York, Ohio, Wisconsin)

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

• Ordovician of Argentina (1), Bolivia (2), Canada (50: British Columbia, Northwest Territories, Nunavut, Ontario, Quebec, Québec), China (5), the Czech Republic (16), Estonia (32), Greenland (1), Malaysia (1), Morocco (1), the Netherlands (1), North Korea (3), Norway (17), South Korea (1), Sweden (9), the United Kingdom (14), United States (146: California, Georgia, Illinois, Illinois, Iowa, Indiana, Kentucky, Maine, Maryland, Michigan, Minnesota, Missouri, New York, Ohio, Oklahoma, Tennessee, Utah, Virginia, Wisconsin)

• Llandeilo of South Korea (1), the United Kingdom (1), United States (1: California)

• Chazy of Canada (3: Quebec), United States (34: New York, Vermont)

• Arenig of Argentina (1), Australia (1), Bolivia (1)

Total: 462 collections including 681 occurrences