Period | Order | Probability | Radiocarbon Dates | Date Built | Date of Destruction | Date of Loss |
Neolithic (4000 - 2500 BC)
| A | 100 | | | | |
Bronze Age (2200 BC - 800 BC)
| B | 100 | 2200 BC - 500 BC | | | |
Iron Age (800 BC - 400 AD)
| C | 100 | 800 BC - 250 AD | | | |
Post-Roman, period uncertain
| D | 100 | | | | |
Medieval (1100 - 1560 AD)
| E | 100 | | | | |
Post-Medieval (from 1560 AD)
| F | 100 | | | | |
Modern (1900 - 2050)
| G | 100 | | | | |
Early Medieval (400 - 900 AD)
| H | 90 | 420 AD - 640 AD | | | |
Iron Age (800 BC - 400 AD)
| C | 80 | 250 AD - 570 AD | | | |