Sorry, no online dictionaries contain the exact phrase epoch when mammals appeared.
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Reverse dictionary results:
1. cenozoic
 2. tertiary
3. quaternary
4. paleogene
5. neogene
6. amazonian
7. archaean
8. azoic
9. boreal
10. carboniferous
 11. cretaceous
12. cryptozoic
13. eon
14. era
15. geologic era
16. hesperian
17. lias
18. liassic
19. nectarian
20. oolitic
 21. paleozoic
22. period
23. phanerozoic
24. postpliocene
25. primordial sea
26. proterozoic
27. psychozoic
28. recent
29. ectozoic
30. subboreal
 31. erathem
32. miogeosyncline
33. stone age
34. extinction event
35. pretertiary
36. mass extinction
37. paleocontinent
38. neogenic

You can look up the words in the phrase individually using these links:   epoch ?   when ?   mammals ?   appeared ?
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