• Permian of Afghanistan (3 collections), Armenia (3), Azerbaijan (1), Bolivia (24), Cambodia (9), China (72), East Timor (1), Guatemala (1), Indonesia (1), Iran (12), Italy (2), Japan (2), Mexico (7), New Zealand (1), Oman (1), the Russian Federation (14), Tajikistan (1), Thailand (4), Tunisia (2), United States (56: Arizona, California, Kansas, Nevada, New Mexico, Texas), Venezuela (5)

• Carboniferous to Permian of Svalbard and Jan Mayen (1)

• Carboniferous of Algeria (1), China (8), Germany (1), Japan (1), Mexico (2), Poland (2), the Russian Federation (2), Spain (2), Turkey (1), the United Kingdom (2), United States (212: Alaska, Arkansas, Illinois, Indiana, Iowa, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, Ohio, Oklahoma, Pennsylvania, Texas, Utah)

Total: 457 collections including 566 occurrences