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Svatojánský okruh


In the rocky wall of the upper deck of former Solvay’s quarries are clearely uncovered surface karstic phenomenons. Exposed limestone surfaces were formed before the big sea flood (transgression) in older Mesozoic (upper Cretaceous – 95 mil years ago) for many millions of years to the effect of water during the tropical and subtopical climate. Along the fisures water penetrated deeper to the limestone massif. Water surrounding limestone slowly dissolvedand on the limestone surface incurred varied shapes from which the most exciting are called karstic pockets or geological organ. These disparities of surface are for geologists really interesting because create natural traps where retained it, what was elswhere destroyed by erosion. In karstic pockets shown on the quarry walls above us are varied limestone clays containing sea fossils from the age of upper Cretaceous. It’s a prove that a sea flood at the end of Mesozoic attacked even to area of Český kras.
Abandoned quarry walls overgrow by vegetation faster than the soil from the carstic filling, which have very low volume of nutritives and there doesn’t form any breeding mold. These places are settled by pioneering and unassuming plants and grow here ‘pioneering fellowships‘. To the dominating species of timbers belong aspen, maple, silver birch and rocky walls are settled by introduced European black pine. Shrub layer is made by dog rose, thornapple and commor dogwood. Herb layer is made by Blue fescue, stonecrops, wild strawberry, Gentianopsis ciliata or dianthus. From spineless live here blue-winged grasshopper, green tiger beetle or common yellow swallowtail.

GPS position

N 49° 58.373', E 14° 8.603'



Agentura Koniklec
David Kunssberger
Tel.:777 239 238