• Paleocene of United States (1: Texas collection)

• Permian of Australia (4), Canada (1: Nunavut), Greece (1), Iran (1), Oman (2), the Russian Federation (16), Tajikistan (2), Thailand (2), Tunisia (2), United States (52: Idaho, Kansas, Montana, Nevada, Texas, Utah, Wyoming), Venezuela (5)

• Carboniferous of Antarctica (1), Belize (2), Canada (7: Alberta), France (1), Germany (1), Japan (1), the Russian Federation (1), Spain (4), the United Kingdom (2), United States (94: Alaska, California, Colorado, Indiana, Kansas, Kentucky, New Mexico, Oklahoma, Tennessee, Texas, Utah, West Virginia)

• Devonian of Canada (2: Northwest Territories), Germany (8), Morocco (6), Spain (9), United States (20: Montana, New York, West Virginia, Maryland, Pennsylvania), Western Sahara (1)

• Silurian of Belarus (1), Norway (7), Sweden (1), United States (4: New York, Wisconsin)

• Arenig of Ireland (1)

• Ordovician of Argentina (3), Canada (1: Quebec), Estonia (2), France (3), India (1), Italy (1), Norway (2), Sweden (2), the United Kingdom (1), United States (4: Kentucky, Ohio, Utah)

Total: 283 collections including 319 occurrences