• Rotliegendes of United States (1: Kansas collection)

• Permian of Argentina (6), Australia (1), Austria (1), Brazil (6), China (95), the Czech Republic (1), Egypt (1), France (3), Germany (6), Greenland (1), India (8), Indonesia (1), Italy (1), Madagascar (1), Malaysia (2), Mongolia (1), Morocco (1), North Korea (6), Oman (1), Papua New Guinea (1), Peru (1), Portugal (1), the Russian Federation (37), Saudi Arabia (1), South Africa (6), South Korea (5), Spain (1), Thailand (2), Turkey (1), United States (18: Arizona, Colorado, Kansas, Oklahoma, Texas), Venezuela (1), Zimbabwe (1)

• Namurian of Spain (1)

• Carboniferous to Permian of Morocco (1), Spain (1)

• Carboniferous of Belgium (1), Canada (10: New Brunswick, Nova Scotia, Prince Edward Island), France (1), Germany (6), the Netherlands (2), Portugal (4), the Russian Federation (1), Spain (11), Turkey (3), the United Kingdom (8), United States (72: Alabama, Arizona, Georgia, Illinois, Indiana, Iowa, Kansas, Kentucky, Michigan, Missouri, New Mexico, Ohio, Oklahoma, Pennsylvania, Texas, Utah, West Virginia)

• Devonian of Belgium (4), China (1), United States (4: Indiana, Kentucky, West Virginia)

Total: 351 collections including 602 occurrences