• Permian of United States (2: Alaska collections)

• Carboniferous of United States (8: Alaska, Arizona, California, Nevada)

• Couvinien of Australia (1)

• Devonian of Australia (5), Spain (2), United States (14: Colorado, Indiana, New York, Ohio)

• Silurian of Australia (12), Canada (45: British Columbia, Manitoba, Northwest Territories, Northwest Territories and Yukon, Ontario, Quebec, Québec), China (2), Estonia (1), India (4), Kazakhstan (2), Mongolia (4), Norway (2), the Russian Federation (10), the United Kingdom (1), United States (11: California, Indiana, Iowa, Kentucky, Nevada, New York, Ohio), Venezuela (1)

• Chazyan of United States (1: Vermont)

• Ordovician to Silurian of Canada (7: British Columbia, Northwest Territories, Québec), Norway (1)

• Ordovician of Australia (4), Canada (167: Alberta, British Columbia, British Columbia, Alberta, Manitoba, Northwest Territories, Nunavut, Ontario, Quebec, Québec, Saskatchewan), China (19), Estonia (45), Ireland (1), Mongolia (10), Norway (18), the Russian Federation (17), Sweden (17), United States (212: Alaska, California, Colorado, Georgia, Illinois, Indiana, Iowa, Iowa, Illinois, Kentucky, Kentucky, Indiana, Ohio, Michigan, Minnesota, Missouri, Nevada, Nevada, Utah, New Mexico, New Mexico, Texas, New York, Ohio, Tennessee, Texas, Utah, Wisconsin, Wyoming), Venezuela (1)

• Ibexian of United States (1: Nevada)

Total: 648 collections including 943 occurrences