external image dendro.gifDendrochronology

Dendrochronology is a way to date when wooden artifacts were made by comparing the rings left in the wood to a sample of wood from the same climate. This works because the rings that grow inside trees annually are different depending on the weather of that year. If they match up we can tell that they were made in the same year as the sample. It is possible to create a pattern in these rings going back centries if you have samples from different time periods from the same area. To create this pattern you use the overlap between the different samples to date each piece with certainty and by putting these pieces in chronilogical order you can create a timeline of tree growth.( Sarah, Emily & Robert )
Lendering, Jona. "Dendrochronology" Dendrochronology,Feb,3,2010