• Permian of Bolivia (1 collection), Canada (15: Nunavut, Yukon), China (30), Indonesia (3), Iran (4), Japan (2), Laos (1), Malaysia (1), Nepal (1), Pakistan (10), the Russian Federation (4), Svalbard and Jan Mayen (2), Thailand (2), United States (66: Kansas, Texas)

• Carboniferous to Permian of United States (4: Texas)

• Carboniferous of Australia (2), Canada (2: Nunavut), China (1), Egypt (1), Malaysia (1), Mexico (1), the Russian Federation (1), South Korea (1), Svalbard and Jan Mayen (1), United States (145: Illinois, Kansas, Missouri, Nebraska, New Mexico, Texas, Utah, Wyoming)

Total: 302 collections including 315 occurrences