ABSTRACTThe Schmidt Test-hammer has for some years been used to measure the hardness of different rock-surfaces, and to date boulders in moraine deposits relative to each other. In this paper applications on isostatically raised boulder-beaches and rocky shores are described. The research area is the northern Swedish Bothnian coast where present isostatic uplift is between 0.8 - 1.0 cm/year. Elevations above sea-level can thus be converted to a time scale. Rebound-values (R) of the Schmidt-hammer are correlated with the altitude, and rock-weathering rates can be estimated for each site.A raised boulder-field in the Nordingråregion has been studied using the method to construct a weathering regression line and to find out if some of the higher ramparts could represent transgression-zones. Lichenometric studies, including the construction of a thallus growth curve forRhizocarpon geographicumhave also been carried out. The lichenometric results were used to try to confirm the results of the Schmidt hammer measurements.This method has applications in both geomorphology and archaeology. For example, the catchment areas for some large ancient grave-cairns on the boulder-beach have been discovered.