Abstract
In Rychleby Mountains foreland and Zlaté Hory Highlands exists relationship between frequency of boulders in glacigenic sediments and character of preglacial bedrock. On the soft bedrock (Neogene sediments, kaolinic granitoid) occurs lodgement of boulders. Glacial sediments on the soft bedrock are therefore characterized by high concentration of boulders. On the hard bedrock (non-kaolinic fresh granitoid, metamorphites) there is no lodgement or the lodgement is sporadic. Glacial sediments on the hard bedrock have therefore lower concentration of boulders. On suitable places the glacier detached from the hard bedrock angular boulders which the glacier deposited in the subglacial mobile deformable bed. Loose local boulders from cracked bedrock or eroded glactectonites and tills into glacifluvial sediments also occurred. In the sediments are occurring small boulders (the size is just above the most coarse gravel) of rocks from Rychleby Mts. and Zlaté Hory Highland which the glacier took over from the preglacial colluvial, alluvial and fluvial sediments.
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