Definition
Lichenometry dates when a young rock surface was created by measuring the sizes of lichens whose growth rate is known.
Introduction
Lichens are an ancient type of symbiotic growth where algae create food for fungi, that provide shelter for the algae. Their great variety includes delicate foliose lichens growing on trees and rocks. Lichenometry uses only the crustose types (Figs. 1 and 2) that can adhere tightly to rock substrates for a 1,000 years. Figure 2 shows the type of block for dating a block. It has a range of thallus sizes, but only the largest lichen is measured, the assumption being that it most closely approximates the rockfall arrival time.
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Bull, W.B. (2013). Lichenometry. In: Rink, W., Thompson, J. (eds) Encyclopedia of Scientific Dating Methods. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6326-5_178-1
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