• Devonian of France (1 collection), United States (3: Michigan, New York, Ohio)

• Niagaran of United States (1: New York)

• Silurian of Canada (46: Manitoba, Northwest Territories, Nova Scotia, Ontario, Québec), China (11), the Czech Republic (2), Estonia (1), Norway (1), the Russian Federation (5), Sweden (3), the United Kingdom (4), United States (62: Alaska, California, Georgia, Indiana, Maryland, Michigan, New York, Ohio, Virginia, West Virginia)

• Whiterockian of Canada (1: Newfoundland and Labrador), United States (2: California, Minnesota)

• Chazyan of United States (1: New York)

• Arenig of China (8), United States (2: Montana, Oklahoma)

• Arenigian of United States (1: Virginia)

• Ordovician of Australia (3), Canada (96: Manitoba, Newfoundland, Northwest Territories, Nunavut, Ontario, Quebec, Québec), China (8), Estonia (1), Greenland (3), Norway (2), Svalbard and Jan Mayen (2), the United Kingdom (6), United States (197: Alaska, Arkansas, California, Georgia, Illinois, Iowa, Indiana, Iowa, Kentucky, Maryland, Michigan, Minnesota, Missouri, Montana, New Mexico, New York, Ohio, Oklahoma, Tennessee, Texas, Utah, Virginia, Wisconsin, Wyoming)

• Tremadoc of China (1)

Total: 474 collections including 662 occurrences