Geological conditions - factor of origin of two different cave systems in two adjacent valleys (the DemšnovskŠ Valley and the JŠnska Valley, the Low Tatras, Slovakia)
Milan Maruöin - (32/1,2003)
The DemšnovskŠ Valley is the most famous karst valley in the northern slopes of the Low Tatras. There the DemšnovskŠ Cave system is developed more than 30 km long. The similar karst valley, the JŠnska Valley with dozens of underground karst phenomena is situated ten kilometers to the east. The total length of these caves exceeds 30 km. The geomorphological, hydrological, and karst conditions of these two valleys are similar, nevertheless there are several outstanding differencies between two cave systems developed in them. The whole of the DemšnovskŠ Cave system is developed within the eastern slope of the DemšnovskŠ Valley. On the contrary in the JŠnska Valley significant caves are situated on both sides of the valley. Besides this difference the DemšnovskŠ Cave system is penetrable through the whole of its length whereas cave system of the JŠnska Valley is not penetrable although connection of the underground spaces was proved by various methods. The described state is caused by different geological conditions in these valleys. Both cave systems are developed mostly in the Middle Triassic Gutenstein Limestones. But the DemšnovskŠ Valley is situated in the area which is built by monocline of the KrŪžnansky nappe. In the territory of the JŠnska Valley there is the Choč, sky nappe which is tectonically very complicatedly framed.