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All species showed growth rings visible to the naked eye.The ring boundaries in all cases were marked by bands of marginal parenchyma.Core sample are drilled in situ using a professional Haglöf 10” 3-thread increment borer.The hole made at the base of the trunk of an old grapevine is 4.3mm in diameter, which is not harmful to the plant.According to David Rohl, the Sweet Track chronology from Southwest England was ‘re-measured’ when it did not agree with the published dendrochronology from Northern Ireland (Belfast).Also, the construction of a detailed sequence from southern Germany was abandoned in deference to the Belfast chronology, even though the authors of the German study had been confident of its accuracy until the Belfast one was published.Recent research on seasonal effects on tree rings in other trees in the same genus, the plantation pine , has revealed that up to five rings per year can be produced and extra rings are often indistinguishable, even under the microscope, from annual rings.
This would mean they pre-dated the Flood which occurred around 4,350 years ago, taking a straightforward approach to Biblical chronology.
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This procedure depends on temporal placement of fragments of wood using carbon-14 (C age and that also extends to a younger age.