Lichen dating

Then the centimeters can be multiplied by five to get the latest date that the wall could have been built.

This makes it easy to calculate their growth on stonewalls, gravestones, and other surfaces.The three main types of lichens found in New England are: crustose, foliose, and fructicose.Each species of lichens has distinguishing characteristics which separates one from another.If the measurements are similar it is a good indication that the estimated date is somewhat accurate.On the other hand, if there are no other colonies of lichens, or the measurements are significantly different, it might be hard to get an accurate date. If the artifact one is studying is near an industrial park or factory, the results may be incorrect.

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