• Quaternary of Mexico (1 collection), United States (31: Alabama, Arizona, Arkansas, California, Florida, Georgia, Kansas, Maryland, Nevada, New Mexico, Oklahoma, Pennsylvania, Tennessee, Texas, Virginia, West Virginia)

• Blancan of Mexico (1), United States (7: Idaho, Kansas, Nebraska, Washington)

• Hemphillian of United States (6: Arizona, Nebraska, Oklahoma)

• Miocene of Canada (1: Saskatchewan), United States (9: Florida, Kansas, Nebraska, South Dakota)

Total: 56 collections including 76 occurrences