• Permian of Canada (3: Yukon collections), Mexico (3), the Russian Federation (2), United States (9: Idaho, Texas, Utah, Wyoming)

• Carboniferous of Argentina (2), Australia (1), the Czech Republic (3), Iran (3), Peru (1), the United Kingdom (5), United States (25: Alaska, California, Colorado, Idaho, Indiana, Missouri, Montana, Nevada, New Mexico, Utah)

• Devonian of Afghanistan (6), Australia (3), Canada (27: Alberta, British Columbia, Northwest Territories, Northwest Territories and Yukon, Nunavut, Ontario, Yukon), China (16), Colombia (1), the Czech Republic (4), France (1), Germany (5), Iran (6), Libya (10), Morocco (1), Poland (7), the Russian Federation (3), United States (552: Alaska, Arizona, Colorado, Iowa, Maryland, Michigan, Montana, Nevada, New Jersey, New Mexico, New York, Ohio, Oklahoma, Pennsylvania, Virginia)

• Silurian of Canada (2: Quebec, Québec), the Czech Republic (3), Spain (1), United States (1: California)

Total: 706 collections including 754 occurrences