It is possible to estimate the age of previous geomorphological events if the growth rate of lichens is known. Lichen growth rates can also be used to indicate global warming and the status of the environment because lichens are very sensitive to subtle climatic and chemical changes (Brabyn et al. (2005) NZ Geogr. 61). See also Gob et al. (2008) Geomorph. 94, 1–2.
Subjects: Earth Sciences and Geography.