The Tišnov Karst
The karstic phenomena in the surroundings of the highest peak on the Hill Květnice (the cave Pod Křížem/Under the Cross, the Květnice Abyss, the King’s cave/Králova jeskyně), on the hill Dřínová and on the top of the hill Tábory near the village Štěpánovice (Vavříček’s Cave/Vavříkova jeskyně) are generally referred to as the Tišnov karst/Tišnovský kras. These secluded phenomena bound to the topsoil Devonian limestone in the development of the hill Květnice, made a whole in the past. This whole became divided due to the later tectonic and erosion activities of the river Svratka and the brook Besének.
With the exception of the fields of lapis, the Tišnov karst lacks the typical surface features – sink holes, blind valleys, open abyss and similar other features...
Vavříček’s Cave/Vavříkova jeskyně
Rudolf Vavříček, a native of Štěpánovice, discovered the cave in the north-eastern slope of the hill Tábory near the village Štěpánovice in 1945. The entrance into the cave was so narrow that it had to be widened using explosives. The cave has the character of an abyss with a bottom filled up with scree and is 17 metres deep. Big draught passing through the cave shows that there may be other karstic space under the scree grate.
The Lažánky-Heroltice Karst
Another karstic area is situated south of Tišnov between Heroltice and Bílý potok. The karstic phenomena are bound to a strip of the local Devonian limestone of the Lažánky-Heroltice area. The karst has developed in several layers/storeys and unlike the Tišnov karst it remains active at least in its lowest layer. The cave systems were created as a result of activities of three subterranean streams: the first brook caves in south of the village Maršov down the bottom of the Silver trench/Stříbrná zmola. The other brook disappears north of Lažánky in the Lažánky sinkhole and rises 1.5 kilometres away in the Maršovice channel (in a place called Vinc’s karst spring) The last subterranean stream is the Pejškov brook which rises in a place called „Na Bílé“ near the village Heroltice. Most of the above-mentioned karstic caves have remained not accessible.
Based on the materials provided by RNDr. Drahoš Šikola