• Permian of Afghanistan (1 collection), Bolivia (5), Canada (31: British Columbia, Nunavut, Yukon), Chile (5), China (30), Greenland (30), Iran (6), Japan (2), Laos (1), Mexico (4), Mongolia (8), the Russian Federation (22), Svalbard and Jan Mayen (5), Ukraine (1), United States (78: Alaska, Arizona, California, Idaho, Nevada, New Mexico, Oregon, Texas, Utah)

• Carboniferous of Argentina (2), Australia (19), Brazil (1), Canada (17: Alberta, Northwest Territories, Nunavut, Yukon), China (6), Ireland (1), Libya (1), Peru (3), the Russian Federation (2), South Korea (1), the United Kingdom (21), United States (122: Alaska, Arizona, Arkansas, California, Idaho, Idaho-Utah, Indiana, Iowa, Kentucky, Missouri, Montana, Nevada, New Mexico, Oklahoma, Tennessee, Texas, Wyoming)

• Devonian of Afghanistan (1)

Total: 426 collections including 456 occurrences