| 21. | The exact dating is a goal of ongoing research based on radiocarbon analysis and dendrochronology.
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| 22. | The Blake House was constructed in 1661, as was confirmed by dendrochronology in 2007.
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| 23. | For relatively recent periods data from radiocarbon dating and dendrochronology also support the MIS data.
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| 24. | Dendrochronology gives both a felling date of between October AD 44 and March AD 45.
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| 25. | Some of the timbers have survived, allowing archaeologists to date the fort through dendrochronology.
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| 26. | Tree rings are the basis of dendrochronology, which dates wooden objects and associated artifacts.
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| 27. | However, dendrochronology revealed that the wood dated from the second half of the 16th century.
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| 28. | The developments of radiocarbon dating and dendrochronology have done much to further knowledge in this area.
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| 29. | Dendrochronology indicates that the last tree felled for construction on the mesa was cut in 1281.
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| 30. | Baillie is a leading expert in dendrochronology, or dating by means of tree-rings.
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