• Permian of Afghanistan (7 collections), Australia (170), Brazil (1), Canada (3: Nunavut, Yukon), China (13), Greece (1), India (13), Indonesia (3), Mongolia (6), Nepal (20), New Zealand (1), Oman (30), Pakistan (2), the Russian Federation (25), Slovenia (1), Svalbard and Jan Mayen (2), Tajikistan (4)

• Carboniferous of Afghanistan (3), Argentina (13), Australia (20), Canada (29: Alberta, Northwest Territories, Yukon), Chile (2), China (5), Egypt (1), France (1), India (15), Iran (1), Ireland (1), Libya (8), Mexico (2), Nepal (1), the Russian Federation (2), the United Kingdom (18), United States (85: Alaska, California, Illinois, Indiana, Iowa, Iowa/Illinois, Missouri, Montana, Nevada, Oklahoma, Utah, Virginia)

• Devonian of Canada (2: Alberta), China (2), France (1), United States (51: Missouri, Montana, Ohio)

• Silurian of Ukraine (1)

Total: 566 collections including 631 occurrences