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Lichenometric dating of debris‐flow deposits on alpine colluvial fans in Southwest Norway
Author(s) -
Innes John L.
Publication year - 1985
Publication title -
earth surface processes and landforms
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.294
H-Index - 127
eISSN - 1096-9837
pISSN - 0197-9337
DOI - 10.1002/esp.3290100510
Subject(s) - colluvium , debris flow , geology , debris , norwegian , geomorphology , physical geography , hydrology (agriculture) , geography , geotechnical engineering , linguistics , oceanography , alluvium , philosophy
Lichenometry provides a suitable means of dating recent debris‐flow activity on alpine colluvial fans. Existing growth curves can be used, provided that anomalous thalli are excluded and allowances are made for differences in the growth rates of Rhizocarpon alpieola and Rhizocarpon section Rhizocarpon thalli. The distribution of flow deposits through time is non‐random and two periods of increased activity (1670‐1720 AD and 1790‐1860 AD) can be identified. There is no evidence for a large increase in debris‐flow activity in the late 19th century, as has been found in Scotland. This can be attributed to the absence of detrimental landuse practices in the Norwegian study areas.