• Quaternary of Canada (1: Alberta collection), Mexico (13), United States (214: Alabama, Arizona, Arkansas, California, Colorado, Florida, Georgia, Indiana, Kansas, Maryland, Missouri, Montana, Nebraska, Nevada, New Mexico, Ohio, Oklahoma, Oregon, South Dakota, Tennessee, Texas, Utah, Virginia, West Virginia, Wyoming)

• Blancan of Mexico (2), United States (89: Arizona, California, Idaho, Kansas, Nebraska, Nevada, New Mexico, Texas, Washington)

• Pliocene of United States (1: California)

• Hemphillian of Mexico (1), United States (8: California, Nebraska, Nevada, Oregon, Texas)

Total: 329 collections including 377 occurrences