In archaeology, palaeontology, and geomorphology, lichenometry is a geomorphic method of geochronologic dating that uses lichen growth to determine the age of exposed rock, based on a presumed specific rate of increase in radial size over time.{rp|9} Measuring the diameter of the largest lichen of a species on a rock surface can therefore be used ...
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http://en.wikipedia.org/wiki/Lichenometry
A method of numerical dating that uses the size of lichen colonies on a rock surface to determine the surface's age. Lich-enometry is used for rock surfaces less than about 9000 years old.
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http://www.encyclo.co.uk/local/22291
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