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Lichenometric Dating: Science or Pseudo-Science?

Published online by Cambridge University Press:  20 January 2017

Gerald Osborn ,
Daniel McCarthy ,
Aline LaBrie  and
Randall Burke
Gerald Osborn*
Affiliation:
Department of Geoscience, University of Calgary, Calgary T2N1N4, Canada
Daniel McCarthy
Affiliation:
Department of Earth Sciences, Brock University, St. Catharines, Ontario L2S 3A1, Canada
Aline LaBrie
Affiliation:
Canadian Natural Resources Ltd., 2500, 855 2nd Street SW, Calgary, Alberta T2P4J8, Canada
Randall Burke
Affiliation:
1705, 700 9th Street SW, Calgary, Alberta T2P2B5, Canada
*
*Corresponding author. E-mail address:osborn@ucalgary.ca (G. Osborn).
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Abstract

The popular technique of estimating ages of deposits from sizes of lichens continues despite valid criticism, and without agreement on range of utility, treatment of error, and methods of measurement, sampling, and data handling. A major source of error is the assumption that the largest lichen(s) colonized soon after deposition and will survive indefinitely. Recent studies on lichen mortality suggest that this assumption is untenable. Meanwhile, the use of “growth curves” constructed from independently dated substrates is problematic for many reasons, but this has not prevented the publication of baseless claims of accuracy and ages that are extrapolated well beyond data. Experiments indicate that numeric lichenometric ages are not reliable, and in general do not advance the cause of Quaternary science. There are a few studies suggesting reliability, and indeed there may be cases where lichens and growth curves actually provide realistic numerical ages. But it cannot be foretold which lichen assemblages will provide good ages and which bad ages. The logical conclusion is that no assumption of good ages can be made, and that it is folly to assign numerical ages to a deposit on the basis of lichen sizes.

Keywords

LichenometryLichenometric datingGrowth curvesGeochronologyRhizocarpon geographicumGlacial chronology

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Type
Forum Article
Information
Quaternary Research , Volume 83 , Issue 1 , January 2015 , pp. 1 - 12
Copyright
University of Washington

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