Related Clues:
- Tertiary Period part
- Epoch in which mammals became dominant
- Epoch between Paleocene and Oligocene
- Epoch that saw the advent of mammals
- Geological period
- Epoch when mammals arose
- Epoch of 50 million years ago
- Epoch characterized by the rise of mammals
- Epoch of modern birds and mammals
- Epoch 50 million years ago
- Geological epoch
- Geologic epoch
- Epoch in which modern mammals first emerged
- Dawn-of-mammals epoch
- Epoch when modern mammals appeared