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 | European Faunal Zones | |||
|---|---|---|---|---|---|
| 1.4 | |||||
| Neogene | Pliocene | Piacenzian | Senecan/Rexroadian | MN 16 | 2.58 |
| MN 15 | 3.2 | ||||
| Zanclean | 3.6 | ||||
| MN 14 | 4.2 | ||||
| Late Hemphillian/late Early Hemphillian/early Early Hemphillian | 4.7 | ||||
| MN 13 | 4.9 | ||||
| Miocene | Messinian | 5.333 | |||
| Tortonian | MN 12 | 7.246 | |||
| MN 11 | 7.75 | ||||
| MN 10 | 8.7 | ||||
| Late Clarendonian/Early Clarendonian | 9.4 | ||||
| MN 9 | 9.7 | ||||
| MN 7 + 8 | 11.1 | ||||
| Serravallian | 11.63 | ||||
| late Late Barstovian/early Late Barstovian/Early Barstovian | 12.5 | ||||
| MN 6 | 12.8 * | ||||
| Langhian | MN 5 | 13.82 | |||
| Burdigalian | MN 4 | 15.98 | |||
| Late Hemingfordian/Early Hemingfordian | 16.3 | ||||
| MN 3 | 16.9 | ||||
| late Late Arikareean/early Late Arikareean/late Early Arikareean/early Early Arikareean/Harrisonian | 18.5 | ||||
| MN 2 | 20 | ||||
| Aquitanian | 20.44 | ||||
| MN 1 | 22.4 | ||||
| 23.03 * | |||||
| 23.1 | |||||
| 29.5 | |||||