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  • The Dendrochronology

    • The Method
    • Heartwood, sapwood, wane
    • Dating process
    • Certainty of datings
    • Statistical evaluation
    • Sample quality
    • Interpretation of datings
  • About taking samples

    • Core drill
    • Core drill, Berlin-type
    • Borerhandling
    • Methods of sampling
    • Sampling-protokoll
    • Sample-shipping
    • Preservation of sapwood
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  • The Dendrochronology
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The Method

The Method

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Dendrochronology as a scientific method for the dating of wood, depends on the fact that trees build annual rings which vary in shape from one year to another. …
Heartwood, sapwood, wane

Heartwood, sapwood, wane

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In central Europe four species of trees prevail in utilization for house building: Oak, spruce, fir and pine. Two of these, oak and pine, show a difference …
Dating process

Dating process

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The procedure of Dendrochronology rests upon the fact that there is a different increment in a trees growth depending on location-based influences. A major …
Certainty of datings

Certainty of datings

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A question frequently addressed to Dendrochronology is: How certain is a certified dating effectively? To answer this question we have to deal with the value …
Statistical evaluation

Statistical evaluation

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Today the determination of synchronicities is made aided by software. In contrast to the graphical comparison aided only by a light table from the very …
Sample quality

Sample quality

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In general a sample can merely be dated with a sufficient degree of statistical coverage, if it has a quantity of at least 60-70 annual rings. Only in …
Interpretation of datings

Interpretation of datings

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A dendrochronological dating of samples from a building provides us with the year the tree was cut but does not indicate the year the building was erected. …

The most important

With the taking of the sample it is already decided whether a dating can be successful. If possible, the forest edge - the last annual ring formed by the tree - should be preserved. Only then can the felling year be determined precisely. It is also of decisive importance how many annual rings are available on the sample. There should be at least 50. The more, the better and the more reliable the dating. If no tree slices are available for the evaluation, the samples can also be obtained with a special drill.

More about the dendro drill

The collection protocol

Where do the samples come from? Accurate documentation for processing in the laboratory is imperative. Not only does it record the origin of the wood, it also provides important information about its use in the building or the location of artefacts found in archaeological excavations, thus facilitating reconstruction and later retrieval in the building. In this way, information from the joinery marks also helps us to identify the timbers in the overall context and to recognise second or multiple uses.

More about the protocol
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