• Quaternary of Canada (15: Alberta, New Brunswick, Northwest Territories, Nova Scotia, Ontario, Quebec, Yukon collections), China (1), the Czech Republic (3), France (3), Germany (13), Greece (7), Hungary (3), Italy (4), the Netherlands (4), North Atlantic (1), Poland (1), Romania (9), the Russian Federation (2), South Africa (1), Spain (6), Turkey (2), Ukraine (1), the United Kingdom (9), United States (202: Alabama, Alaska, Arizona, Arkansas, Florida, Georgia, Idaho, Illinois, Indiana, Iowa, Kansas, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Jersey, New York, Ohio, Oklahoma, Oregon, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Virginia, West Virginia, Wisconsin)

• Blancan of Mexico (1), United States (55: Arizona, California, Florida, Idaho, Kansas, Nebraska, New Mexico, Oregon, South Dakota, Texas, Washington)

• Pliocene to Pleistocene of Italy (2), the Russian Federation (1), Spain (1), United States (1: Montana)

• Pliocene of Canada (1: Northwest Territories), China (6), France (2), Germany (1), Greece (8), Hungary (1), Italy (3), Kazakhstan (1), Moldova (1), Poland (1), Romania (15), the Russian Federation (5), Slovakia (3), Spain (1), Ukraine (3), the United Kingdom (2), United States (2: Idaho)

• Hemphillian of Canada (1: Alberta), United States (42: Alabama, Arizona, California, Florida, Idaho, Indiana, Montana, Nebraska, Nevada, New Mexico, Oklahoma, Oregon, Washington)

• Miocene of Austria (2), Bulgaria (1), Canada (9: Saskatchewan), China (18), France (29), Germany (8), Greece (2), Hungary (1), Italy (1), Kazakhstan (1), Moldova (3), Poland (3), Portugal (1), the Russian Federation (1), Serbia and Montenegro (1), Slovakia (2), Spain (17), Switzerland (6), Turkey (5), Ukraine (1), United States (165: California, Colorado, Delaware, Florida, Georgia, Idaho, Kansas, Louisiana, Montana, Nebraska, Nevada, New Mexico, Oklahoma, Oregon, South Dakota, Texas, Utah, Wyoming)

• Harrisonian of United States (19: Montana, Nebraska, South Dakota, Wyoming)

• Arikareean of United States (40: Florida, Idaho, Montana, Nebraska, Nevada, North Dakota, Oregon, South Dakota, Wyoming)

• Oligocene of Belgium (2), Canada (4: Saskatchewan), China (3), France (1), Germany (3), Japan (1), Kazakhstan (13), Spain (1), Switzerland (1), Turkey (1), United States (111: Colorado, Florida, Montana, Nebraska, North Dakota, Oregon, South Dakota)

• Eocene to Oligocene of United States (1: Nebraska)

• Eocene of Canada (7: Saskatchewan), the United Kingdom (1), United States (22: Colorado, Montana, Nebraska, North Dakota, South Dakota, Texas, Utah, Wyoming)

Total: 955 collections including 1138 occurrences