On the accuracy of lichenometric dates: an assessment based on the 'Little Ice Age' moraine sequence of Nigardsbreen, southern Norway
- 1 October 1992
- journal article
- Published by SAGE Publications in The Holocene
- Vol. 2 (3), 227-237
- https://doi.org/10.1177/095968369200200304
Abstract
Families of lichenometric dating curves are constructed using four historically-dated moraine ridges on the glacier foreland of Nigardsbreen (Jostedalsbreen ice cap), southern Norway. A further 20 'Little Ice Age' moraine ridges are dated in terms of median-predicted dates derived from the families of curves. Four approaches are used to assess the accuracy of the median-predicted dates: (1) the extent to which the dates form a temporal sequence; (2) the extent to which they agree with local independent evidence of glacier variations; (3) the extent to which dates agree when the moraine sequences on the two sides of the glacier foreland are dated separately; and (4) the extent to which they agree when section Rhizocarpon is differentiated from lichens of the Rhizocarpon subgenus as a whole. It is concluded that under conditions favourable for lichenometric dating, median-predicted dates have attained an accuracy of ~10% on the 'Little Ice Age' timescale. Realistic error limits are considered to be of the order of ±20 years for the oldest moraines and ±5 years for the youngest. Previous dates for the Nigardsbreen moraine sequence derived from single lichenometric dating curves may be ~5% less accurate. It is suggested that the range of predicted dates obtained from families of lichenometric dating curves can be used as a conservative surrogate for accuracy.Keywords
This publication has 28 references indexed in Scilit:
- Aranuian vegetation history of the Arrowsmith Range, Canterbury II. Revised chronology for moraines of the Cameron GlacierNew Zealand Journal of Botany, 1990
- Historic Glacier Variations in ScandinaviaPublished by Springer Nature ,1989
- Techniques in Lichenometry: Identifying the Yellow RhizocarponsArctic and Alpine Research, 1988
- Neoglaciation in South Norway using lichenometric methodsNorsk Geografisk Tidsskrift - Norwegian Journal of Geography, 1986
- Development and Application of a Lichenometric Dating Curve, Brooks Range, AlaskaPublished by Elsevier ,1984
- Size Variation of Rhizocarpon on Moraine Slopes in Southern NorwayArctic and Alpine Research, 1983
- Size Frequency Distributions as a Lichenometric Technique: An AssessmentArctic and Alpine Research, 1983
- Does the Size of Lichen Thalli Really Constitute a Valid Measure for Dating Glacial Deposits?Arctic and Alpine Research, 1973
- Glacial Chronology and Glacial Geomorphology in the Marginal Zones of the Glaciers, Midtdalsbreen and Nigardsbreen, South NorwayNorsk Geografisk Tidsskrift - Norwegian Journal of Geography, 1971
- Ist die Grosse des Flechtenthallus wirklich ein brauchbarer Masstab zur Datierung von glazialmorphologischen ReliktenGeografiska Annaler: Series A, Physical Geography, 1966