- - Epoch when the Mediterranean Sea nearly dried up
- - First geological epoch of the Neogene Period
- - A Tertiary epoch
- - Division of the tertiary system.
- - Period of the Age of Mammals.
- - Tertiary epoch
- - Period said to be this writer's speciality — nothing in that
- - Long-ago epoch
- - Epoch with big birds
- - Epoch in which grazing mammals became widespread
- - A geological epoch
- - Geological epoch when mastodons appeared
- - When mammals appeared
- - Epoch that produced grazing animals
- - Geological epoch
- - Geological period
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