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Development of lichenometric dating curves for Highland Scotland

Published online by Cambridge University Press:  03 November 2011

John L. Innes
John L. Innes
Affiliation:
Department of Geography, University of Cambridge, Downing Place, Cambridge, CB2 3EN, England.
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Abstract

The lichens growing on gravestones in 142 Scottish graveyards have been examined. Measurements were restricted to Section Rhizocarpon thalii. These data permit the development of lichenometric growth curves on acidic igneous, basic igneous, sandstone and slate substrates in most areas of Highland Scotland. The colonisation of gravestones, which is extremely erratic, takes place after a minimum of eight years. The ‘great period’ of growth lasts for approximately 20 years after the erection of the gravestone. 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. Growth rates are non-linear, decreasing with time. Calculated lichen factors for acidic igneous substrates range from 33 to 104 mm. The distributions of different types of gravestones are non-uniform in both time and space, making the comparison of growth rates on different rock types impractical. The results indicate that there may be a gradual decrease in the growth rates from W to E, reflecting the decreasing maritime influence towards the E.

Keywords

acidicbasicgravestoneigneouslichen colonisationlichen growthRhizocarponsandstoneslate.
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 74 , Issue 1 , 1983 , pp. 23 - 32
Copyright
Copyright © Royal Society of Edinburgh 1983

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