Incision of the quarry presents an almost 80 m high section displaying loess, calcareous claystones of the Březno Formation, yellow “foundry” sandstones, and the lowermost-lying whitish-grey “glass” sands which are exploited in the quarry. Quarry faces show frequent sedimentary structures, such as different types of cross-bedding. Locally abundant are fossil tracks as well as body fossils, especially bivalves. A unique feature is the formation of subterranean channels and pseudokarst spaces reaching the height of 15 m and a length of 300 m, which ranks them among the largest in the Bohemian Paradise. These subterranean channels are spatially associated with subsidence shafts (pseudo-sinkholes) formed by suffosion and subterranean erosion, and with early stages of gorges on quarry faces. After rain, spoil tips and slope aprons of quarry faces display small earth pyramids and grain flows; ripple fields are formed under windy conditions. Water issued from the subterranean channels transports sand-sized material, which is deposited in the form of deltas. These are analogies to large subaquatic delta bodies of Cretaceous age which gave rise to the Bohemian Paradise sandstones. The model of their formation can be thus studied directly in the Střeleč Quarry.




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