Barstovian age - Clarendonian age
| International Chronostratigraphic Timescale | North American Land Mammal Ages | |||
|---|---|---|---|---|
| 1.4 | ||||
| Neogene | Pliocene | Piacenzian | Blancan | 2.58 |
| Zanclean | 3.6 | |||
| Hemphillian | 4.7 | |||
| Miocene | Messinian | 5.333 | ||
| Tortonian | 7.246 | |||
| Clarendonian | 9.4 | |||
| Serravallian | 11.63 | |||
| Barstovian | 12.5 | |||
| Langhian | 13.82 | |||
| Burdigalian | 15.98 | |||
| Hemingfordian | 16.3 | |||
| Arikareean | 18.5 | |||
| Aquitanian | 20.44 | |||
| 23.03 | ||||
| 29.5 | ||||