Darganfod ac Archwilio’r Casgliad
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- Y Cyfnod Modern Cynnar (1536 at 1699) (2)
- Y Canol Oesoedd (1086 at 1536) (3)
- Y Canol Oesoedd Cynnar (410 at 1086) (3)
- Rhufeinig (43 at 410) (5)
- Yr Oes Haearn (-700 at 43) (4)
- Yr Oes Efydd (-2,200 at -700) (7)
- Neolithig (-4,400 at -2,200) (8)
- Mesolithig (-8,500 at -4,400) (2)
- Palaeolithig (-250,000 at -8,500) (1)
