clast striation, clast roundness, clast shape, Old Red sandstone clasts, glacial sedimentary environments, Svalbard

The objective of this study were Little Ice Age (LIA) to recent subglacial tills, glaciofluvial sediments of proglacial sandur, esker sediments and sediments of moraine-mound complexes of H?rbyebreen polythermal valley glacier and LIA to recent sediments of lateral moraine, frontal moraine, ice-cored moraine and glaciofluvial sediments of proglacial sandur of Bertilbreen polythermal valley glacier. The results from this research led to the proposal of new methodological approaches. It is mainly the covariant plot of striations and RA, which effectively differentiate subglacial tills from glaciofluvial sediments and allows for identification of the source material of moraine-mound complexes, especially the oldest, more degraded parts near the maximum LIA glacier extent. The second is the covariant plot of distance and RS index to present downstream roundness trends in proglacial glaciofluvial sediments.