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- Q1432441 subject Q8521115.
- Q1432441 subject Q8543757.
- Q1432441 abstract "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. Measuring the diameter of the largest lichen of a species on a rock surface can therefore be used to determine the length of time the rock has been exposed. Lichen can be preserved on old rock faces for up to 10,000 years, providing the maximum age limit of the technique, though it is most accurate (within 10% error) when applied to surfaces that have been exposed for less than 1,000 years. Lichenometry is especially useful for dating surfaces less than 500 years old, as radiocarbon dating techniques are less accurate over this period. The lichens most commonly used for lichenometry are those of the genera Rhizocarpon (e.g. the species Rhizocarpon geographicum) and Xanthoria.It was first employed by Knut Fægri in 1933, though the first exclusively lichenometric paper was not published until 1950, by Austrian Roland Beschel (1928-1971), in a paper concerning the European Alps.Lichenometry can provide dates for glacial deposits in tundra environments, lake level changes, glacial moraines, trim lines, palaeofloods, rockfalls, seismic events associated with the rockfalls, talus (scree) stabilization and former extent of permafrost or very persistent snow cover. It has also been explored as a tool in assessing the speed of glacier retreat due to climate change.Among the potential problems of the technique are the difficulty of correctly identifying the species, delay between exposure and colonization, varying growth rates from region to region as well as the fact that growth rates are not always constant over time, dependence of the rate of growth upon substrate texture and composition, climate, and determining which lichen is the largest.".
- Q1432441 thumbnail Rhizocarpon_geographicum_on_quartz.jpg?width=300.
- Q1432441 wikiPageWikiLink Q1133195.
- Q1432441 wikiPageWikiLink Q125928.
- Q1432441 wikiPageWikiLink Q1286.
- Q1432441 wikiPageWikiLink Q1365267.
- Q1432441 wikiPageWikiLink Q1384033.
- Q1432441 wikiPageWikiLink Q179918.
- Q1432441 wikiPageWikiLink Q207495.
- Q1432441 wikiPageWikiLink Q213891.
- Q1432441 wikiPageWikiLink Q23498.
- Q1432441 wikiPageWikiLink Q2452375.
- Q1432441 wikiPageWikiLink Q2610088.
- Q1432441 wikiPageWikiLink Q3018582.
- Q1432441 wikiPageWikiLink Q37221.
- Q1432441 wikiPageWikiLink Q43142.
- Q1432441 wikiPageWikiLink Q43262.
- Q1432441 wikiPageWikiLink Q52109.
- Q1432441 wikiPageWikiLink Q602963.
- Q1432441 wikiPageWikiLink Q7205.
- Q1432441 wikiPageWikiLink Q7842128.
- Q1432441 wikiPageWikiLink Q830630.
- Q1432441 wikiPageWikiLink Q8521115.
- Q1432441 wikiPageWikiLink Q8543757.
- Q1432441 wikiPageWikiLink Q903816.
- Q1432441 comment "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. Measuring the diameter of the largest lichen of a species on a rock surface can therefore be used to determine the length of time the rock has been exposed.".
- Q1432441 label "Lichenometry".
- Q1432441 depiction Rhizocarpon_geographicum_on_quartz.jpg.