The largest underground space - Bystrický dome, is located on the 7th floor at a depth of 180 m, and its volume reaches 52,500 m3.
Among the unique attractions of the cave is the occurrence of volcanic rocks of the Cretaceous age folded into the limestone formation. They appear in cave corridors in several places, where they draw attention to themselves with a reddish-brown or green color. The volcanic rock contains lenses of white-pink agates. Another remarkable thing are the finds of bat bones, found almost everywhere. According to them, the cave was also named. Their age is estimated at 6000 years. In the peripheral parts of the cave, there are skeletal remains of martens, bears, and even goats.
The average temperature of the cave is +3.5 °C, but some glaciated parts reach an annual average of only +1 °C. Due to the openness of the system, the air flow reaches 5 m/s.
A special representation in the cave system is represented by organogenic sediments with a significant predominance of skeletal remains of bats, after which the cave was named. Fragments of small rodents, marten, brown bear and goat were also found and described. Findings of thanatocenoses of older bones from around 4,000 to 6,000 years ago are rare. The two most numerous species (Brandt's bat and big-eared bat) are typical of this earlier period and nowadays only rarely winter in caves.
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