• Permian of Australia (11 collections), Canada (1: Alberta), India (2), Indonesia (2), Italy (2), New Zealand (3), Peru (2), the Russian Federation (10), Svalbard and Jan Mayen (1), United States (9: Alaska, Nevada, Oregon, Texas, Wyoming)

• Carboniferous to Permian of Laos (1), United States (2: California)

• Carboniferous of Belgium (1), Canada (1: Alberta), Germany (1), Japan (1), Libya (1), Mexico (2), the Russian Federation (1), Spain (1), Ukraine (2), the United Kingdom (13), United States (63: Alabama, Alaska, California, Colorado, Illinois, Indiana, Iowa, Kentucky, Missouri, Montana, Nevada, Ohio, Oklahoma, Tennessee, Texas)

• Devonian of Australia (12), Austria (1), Canada (9: Alberta, Manitoba, New Brunswick, Northwest Territories, Nunavut, Ontario, Yukon), China (2), the Czech Republic (2), France (2), Poland (1), the Russian Federation (3), the United Kingdom (2), United States (12: Alaska, California, Colorado, Nevada, New York)

• Silurian of Brazil (1), the Czech Republic (2), Ireland (1), Poland (1), Sweden (10), United States (8: Alaska, California, Illinois, Iowa, New York, Wisconsin)

• Ordovician of United States (5: Indiana, Ohio, Virginia)

Total: 207 collections including 228 occurrences