• Permian of United States (2: Alaska collections)

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

• Couvinien of Australia (1)

• Devonian of Australia (7), Belgium (2), Canada (3: Manitoba, Ontario), France (2), Germany (1), Laos (1), the Russian Federation (2), Spain (5), United States (51: Alaska, California, Colorado, Indiana, Nevada, New York, Ohio, Tennessee), Venezuela (1)

• Jaani of Estonia (1)

• Silurian of Australia (13), Canada (59: British Columbia, Manitoba, New Brunswick, Northwest Territories, Northwest Territories and Yukon, Nova Scotia, Ontario, Quebec, Québec), China (17), Estonia (8), Greenland (1), India (4), Japan (1), Kazakhstan (2), Mongolia (6), Norway (17), the Russian Federation (28), Spain (1), Sweden (4), Ukraine (3), the United Kingdom (1), United States (93: California, Indiana, Iowa, Kentucky, Nevada, New York, Ohio, Oklahoma), Venezuela (1)

• Chazyan of United States (1: Vermont)

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

• Ordovician of Australia (6), Canada (176: Alberta, British Columbia, British Columbia, Alberta, Manitoba, Northwest Territories, Nunavut, Ontario, Quebec, Québec, Saskatchewan), China (20), Estonia (48), Ireland (1), Mongolia (10), Norway (23), the Russian Federation (18), Sweden (17), the United Kingdom (2), United States (227: 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: 905 collections including 1381 occurrences