• Permian of Austria (1 collection), Canada (1: British Columbia), China (26), Indonesia (2), Iran (2), Japan (6), Laos (1), Malaysia (1), Pakistan (1), Peru (1), the Russian Federation (4), Thailand (1), United States (5: Texas)

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

• Carboniferous of Australia (19), Canada (14: Alberta, Nunavut, Yukon), China (9), Mexico (3), the Russian Federation (1), Slovenia (1), Svalbard and Jan Mayen (1), Ukraine (2), the United Kingdom (45), United States (241: 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: 393 collections including 424 occurrences