Denmark dating culture

With the help of so-called stratigraphy of the soil layers, which provides a time line of archaeological events, archaeologists can say with a high degree of certainty that the wood belongs to the fortress, says Holm.“Now we get nerdy over the really fine, thin soil layers, but we can see that it is a piece of wood, which was last used and discarded in 966 CE at the earliest, and we’re sure that it correlates with the fortress,” she says.The very precise dating was only possible because the plank was made of oak and was especially well-preserved in the water-logged soil.

The wooden plank is approximately one metre long, seven centimetres thick, and was found 2.5 metres beneath the level of the present day valley.

The valley is a water-logged area, which in Viking times was perhaps navigable, although the archaeologists do not know precisely where the water flowed or how wide the channel was.

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But we now know that it was established at about the same time as the others.

Together with the other finds at Borgring, for example wheel tracks that indicate life, we now view the fortress as being more complete,” says archaeologist and excavation leader Nanna Holm.

The wood contained 122 annual rings that could be used for so-called dendrochronological analysis.

Previously, the archaeologists only had wood samples suitable for radiocarbon dating--a method based on the amount of carbon 14 contained within the sample that is relatively less precise.

Archaeologists used carbon dating to discover how old the monument is by testing two samples of wood from the fortress near Køge.

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