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The article proposes that the success of lichenometric dating over the past 50 years has stemmed from its relative simplicity, transparency, and general field applicability.It concludes that any new techniques which ignore these principles are likely to be unjustified, unsuitable to the user community and inappropriate for the subject matter.The primary assumption of lichenometry is that colonization, growth and mortality of Rhizocarpon are similar on surfaces of known and unknown age so that the largest thalli present on the respective faces are of comparable age.This review describes the current state of knowledge regarding the biology of Rhizocarpon and considers two main questions: (1) to what extent does existing knowledge support this assumption; and (2) what further biological observations would be useful both to test its validity and to improve the accuracy of lichenometric dates? Double flood basalts and plume head separation at the 660 kilometer discontinuity, Science, 266, 1367-1369. Underlying fracture zone nature of Astrid Ridge off Antarctica, Queen Maud Land, J. Refined spreading history of the Southwest Indian Ridge for the last 96 Ma, with the aid of satellite data, Geophys.

The lichen factor (growth after 100 years) is correlated with the growth after 25 and 250 years indicating that it is a representative index of the growth rates. Calculated lichen factors for acidic igneous substrates range from 33 to 104 mm.‘Traditional’ lichenometric dating of recent end moraines in Tröllaskagi confirms that there were five periods of moraine abandonment: A. 1810–1820; 1845–1875; late 1880s-early 1890s; 1915–1925; late 1930s-early 1940s. (eds) Environmental Change in Iceland: Past and Present. Inorderto extend moraine dating beyond the lichenometric timescale (pre-A. 1800) it is argued that greater emphasis will have to be placed on surrogate climatic records from peats and lake sediments which can be dated by other methods. (1991) Lichenometric Dating, Lichen Population Studies and Holocene Glacial History in Tröllaskagi, Northern Iceland. This commentary article discusses the relative merits of new mathematical approaches to lichenometry.It highlights their strong reliance on complex statistics; their user un-friendliness; and their occasional mistreatment of existing lichenometric techniques.

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