Early Hemingfordian subage
18.5 - 16.3 Ma
The definition of this interval in the timescale North American Mammal Subages/Zones is taken from the following source:
- M. O. Woodburne. 1987. A prospectus of the North American Mammal Ages. In: Woodburne, M. O. (ed.), Cenozoic Mammals of North America. University of California Press, Berkelery, CA 285-290 view
There are intervals in 9 timescales which overlap this one. show
This interval is used in the definition of 125 collections
A total of 643 collections with 6547 occurrences lie within this time span
| International Chronostratigraphic Timescale | North American Mammal Subages/Zones | North American Land Mammal Ages | |||
|---|---|---|---|---|---|
| 1.4 | |||||
| Neogene | Pliocene | Piacenzian | Senecan/Rexroadian | Blancan | 2.58 |
| Zanclean | 3.6 | ||||
| Late Hemphillian/late Early Hemphillian/early Early Hemphillian | Hemphillian | 4.7 | |||
| Miocene | Messinian | 5.333 | |||
| Tortonian | 7.246 | ||||
| Late Clarendonian/Early Clarendonian | Clarendonian | 9.4 | |||
| Serravallian | 11.63 | ||||
| late Late Barstovian/early Late Barstovian/Early Barstovian | Barstovian | 12.5 | |||
| Langhian | 13.82 | ||||
| Burdigalian | 15.98 | ||||
| Late Hemingfordian/Early Hemingfordian | Hemingfordian | 16.3 | |||
| late Late Arikareean/early Late Arikareean/late Early Arikareean/early Early Arikareean/Harrisonian | Arikareean | 18.5 | |||
| Aquitanian | 20.44 | ||||
| 23.03 * | |||||
| 23.1 | |||||
| 29.5 | |||||