Darganfod ac Archwilio’r Casgliad
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- Y Cyfnod Modern Cynnar (1536 at 1699) (361)
- Y Canol Oesoedd (1086 at 1536) (2,671)
- Y Canol Oesoedd Cynnar (410 at 1086) (260)
- Rhufeinig (43 at 410) (635)
- Yr Oes Haearn (-700 at 43) (1,209)
- Yr Oes Efydd (-2,200 at -700) (492)
- Neolithig (-4,400 at -2,200) (182)
- Mesolithig (-8,500 at -4,400) (64)
- Palaeolithig (-250,000 at -8,500) (5)