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The objective of this study were Little Ice Age (LIA) to recentsubglacial tills, glaciofluvial sediments of proglacial sandur,esker sediments and sediments of moraine-mound complexes ofHorbyebreen polythermal valley glacier and LIA to recentsediments of lateral moraine, frontal moraine, ice-coredmoraine and glaciofluvial sediments of proglacial sandur ofBertilbreen polythermal valley glacier. Fossil (probably earlyHolocene) subglacial and supraglacial tills and sediments ofcoarsegrained glaciomarginal delta of Bertilbreen have alsobeen studied. The research focused on Old Red sandstone clasts,for which roundness, shape and striation presence have beeninvestigated. The results from this research led to theproposal of new methodological approaches. It is mainly thecovariant plot of striations and RA (the share of striatedclasts versus the share of very angular and angular clasts),which effectively differentiate subglacial tills fromglaciofluvial sediments and allows for identification of thesource material of moraine-mound complexes, especially theoldest, more degraded parts near the maximum LIA glacierextent. The second is the covariant plot of distance and RSindex (the distance from the starting point versus the share ofsubangular and subrounded clasts) to present downstreamroundness trends in proglacial glaciofluvial sediments. Theresearch confirmed the crucial role of lithological propertiesof thinly bedded rocks on the shape of these rock clasts insediment and a minimum impact of passive and active transporton the clast shape modification.

czech polar reports

New methods to reconstruct clast transport history in different glacial sedimentary environments: Case study for Old Red sandstone clasts from polythermal Hrbyebreen and Bertilbreen valley glaciers, Central Svalbard