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Abstract
Measurements of post-glacial micro-weathering and removal of weathering products (deterration) have been made between sea-level and 1500 m a.s.1. A specialized form of Ljungner's method (1930, p. 404) was used and an apparatus was constructed to facilitate the measurement.
The results from each locality are reported as mean values of about 50 measurements. The distribution of the mean values with regard to height above sea-level is shown in a diagram (Fig. 2). In spite of the large scatter, the mean values show a clear tendency to increase from 0 to 120 m a.s.1. and to decrease from 120 to 500 m a.s.1. But there is no particular trend above 500 m a.s.1.
The results of the measurements show that the average intensity of deterration on rock surfaces around a C14-dated marine limit (6100 ± 110 years B.P.) and on rock surfaces around the main marine limit (about 10,000 years B.P.) has been almost the same. The highest average intensity in the granite area of the district has surprisingly been at 20–30 m above the main marine limit.
The method described is difficult to use in the schist area of the district, where bare rock surfaces are rare on account of overlying weathering products.
