• Permian of Austria (1 collection), Canada (24: Alberta, British Columbia, Nunavut, Yukon), China (28), Indonesia (2), Iran (4), Japan (7), Laos (2), Malaysia (1), Myanmar (6), Oman (3), Pakistan (1), Peru (1), the Russian Federation (8), Slovenia (4), Thailand (4), Ukraine (1), United States (34: Alaska, Nevada, Oregon, Texas)

• Carboniferous to Permian of United States (3: Texas)

• Carboniferous of Australia (19), Canada (15: Alberta, Nunavut, Yukon), China (12), Malaysia (1), Mexico (3), the Russian Federation (2), Slovenia (2), South Korea (1), Spain (1), Svalbard and Jan Mayen (1), Ukraine (2), the United Kingdom (45), United States (247: Alabama, Alaska, Arizona, Arkansas, California, Idaho, Illinois, Indiana, Iowa, Kansas, Kentucky, Missouri, Montana, Nevada, New Mexico, Ohio, Oklahoma, Pennsylvania, Texas, Utah, Virginia, Wyoming)

• Devonian of United States (1: New Mexico), Vietnam (1)

Total: 487 collections including 529 occurrences