Serravallian

Serravallian is a stage of the middle Miocene epoch that spans the time between 13.65 ± 0.05 Ma and 11.608 ± 0.005 Ma (million years ago).

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[edit] References

Neogene period
Miocene	Pliocene
Aquitanian \| Burdigalian \| Langhian Serravallian \| Tortonian \| Messinian	Zanclean \| Piacenzian → Quaternary