• Permian of Afghanistan (1 collection), Australia (22), Azerbaijan (1), Bolivia (15), Canada (21: British Columbia, Northwest Territories, Nunavut, Yukon), China (56), East Timor (3), Germany (2), Greece (2), Greenland (29), India (1), Indonesia (7), Iran (2), Italy (4), Japan (7), Lithuania (16), Malaysia (6), Mexico (4), Mongolia (2), Nepal (3), New Zealand (3), Pakistan (102), the Russian Federation (21), Slovenia (3), Svalbard and Jan Mayen (1), Tajikistan (3), Thailand (7), Tunisia (3), Ukraine (2), the United Kingdom (26), United States (338: Alaska, California, New Mexico, Oregon, Texas)

• Pennsylvanian of Canada (1: Nunavut), China (1), United States (2: Alaska)

• Namurian of Thailand (1)

• Chesterian of United States (9: Arkansas, Montana, Oklahoma)

• Carboniferous of Australia (12), Bolivia (1), Canada (3: Nunavut, Yukon), China (2), the Czech Republic (1), Italy (1), Libya (1), the Russian Federation (5), South Korea (1), Spain (1), the United Kingdom (12), United States (38: Alaska, Arizona, Illinois, Indiana, Kentucky, Missouri, Montana, Nevada, New Mexico, Oklahoma, Texas)

• Mississippian of United States (4: Alaska, Arizona)

• Devonian of Canada (3: Alberta, Ontario), France (1), Italy (1), United States (24: Arizona, Iowa, Missouri, New York)

Total: 838 collections including 1120 occurrences