14 show caves of the Czech Republic: VISITOR RULES IN EFFECT FROM NOVEMBER 22, 2021 More
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Mladečské Caves

Characteristics / Evolution of the Caves

ORIGIN AND DEVELOPMENT OF THE MLADEČ CAVES

The present appearance of the complex underground labyrinth under the eastern spur of the Třesín Hill (345 m a.s.l.) was also affected by erosion activities of subsurface flows, corrosion action of atmospheric water penetrating into the limestone layers, and repeated tectonic movements in the Haná faults. The cave complex stretches from the valley of the Hradečka Brook to the wide valley of the Morava River and was created as a subhorizontal flow phreatic cave formed by underground water of the Hradečka Brook. The labyrinth of parallel and cross corridors of three main directions and three cave floors influenced the course of folded limestone beds and geological faults. Spacious dominant halls are mostly connected with narrow high corridors narrowing upwards and verging into fissures and chimneys. On fissure crossings and in weakened zones of limestones breakdowns of ceilings and walls occurred and the formed spaces were filled with debris. The Mladeč Caves are characteristic with huge cave coulisses and often perforated rock closures and pillars. At several places high chimneys closed with huge stuck blocks lead to the surface. Stuck rock blocks and stones are often found in high fissures in ceilings as well. The course and period of stagnation of the underground flow, water from which appears today only in the lower floor, which is little known so far, is documented by a detailed modelling of walls and ceilings.

A large amount of loamy, clayey and sandy sediments were successively washed to the caves through chimneys and already forgotten entrances. Many skeletal remains of Pleistocene vertebrates as well as numerous skeletal remains of people together with their tools were found there. Due to previous research excavations and clearings of loams during the works to make the cave accessible to the public, it is no longer possible to determine the original extent and arrangement of sediments and more precise positions of findings. Prevailing erosion and corrosion modelling of the walls in some parts of the caves is complemented by sinter crusts and stalactite and stalagmite decoration which in some parts can be correlated with archaeologically significant layers of cave sediments. The present Mladeč Caves are probably only a part of a large underground system of considerable geological age and complex geological development.