• Permian of Australia (36 collections), Canada (8: Nunavut, Yukon), China (4), India (1), Indonesia (1), Malaysia (4), Mongolia (2), Pakistan (3), the Russian Federation (25), Tajikistan (1), Thailand (6)

• Pennsylvanian of United States (1: Utah)

• Chesterian of United States (16: Arkansas, Montana, Oklahoma, Wyoming)

• Osagean of Canada (2: Northwest Territories), Mexico (2), United States (10: Indiana, Montana, New Mexico, Utah, Virginia)

• Carboniferous of Canada (15: Alberta, Northwest Territories, Yukon), China (1), the Russian Federation (1), United States (84: Alabama, California, Idaho, Illinois, Indiana, Iowa, Kentucky, Montana, Nevada, Oklahoma, Utah)

• Mississippian of United States (4: Alaska, California, Idaho, Washington, Oregon, Idaho, Montana, Nevada, Utah, California)

• Devonian of Afghanistan (1), Canada (1: Alberta), Germany (2), the United Kingdom (2), United States (2: Arizona, Ohio)

Total: 235 collections including 240 occurrences