• Carboniferous of United States (1: Iowa collection)

• Silurian of Canada (3: Ontario, Quebec), Malaysia (1)

• Dobrotivian of Spain (3)

• Aluoja of Estonia (1)

• Whiterockian of United States (7: California, Minnesota, Utah)

• Chazyan of Canada (4: Quebec), United States (12: New York, Vermont)

• Marmor of United States (1: New York)

• Fennian of Malaysia (1)

• Volkhov of Estonia (2)

• Langevoja of Sweden (1)

• Hunderum of Sweden (1)

• Arenig of Argentina (1), Bolivia (6), China (48), France (1), Sweden (3), United States (2: Oklahoma)

• Dawan of China (13)

• Ordovician of Argentina (2), Australia (2), Bolivia (1), Canada (64: Manitoba, Mantiboa, Newfoundland and Labrador, Northwest Territories, Nunavut, Ontario, Quebec, Saskatchewan), China (50), the Czech Republic (2), Estonia (15), France (2), Greenland (1), Iran (1), Ireland (2), Latvia (2), Lithuania (4), Malaysia (1), Morocco (1), Norway (22), the Russian Federation (4), South Korea (7), Spain (3), Svalbard and Jan Mayen (1), Sweden (17), the United Kingdom (30), United States (127: Colorado, Illinois, Iowa, Wisconsin, Indiana, Ohio, Iowa, Iowa, Minnesota, Kentucky, Michigan, Minnesota, Missouri, Nevada, New York, Ohio, Oklahoma, South Dakota, Tennessee, Texas, Utah, Vermont, Virginia, Wyoming)

• Canadian of United States (6: Alaska, Maryland)

• Tremadoc of Argentina (1), China (12)

• Ibexian of Thailand (3)

• Cambrian of China (1)

Total: 496 collections including 735 occurrences