Non-karstic Caves of the Gerecse Mountains
The Gerecse Mountains form an 800km2 area in the Trans-Danubien Mountains between the River Danube, Által Creek and Kenyérmezői Creek. The area is heavily criss-crossed by tectonic features. Its higher reaches comprise of ranges of faulted dolomite and limstone. Tectonically formed valleys and basins lie among the ranges. Along the fault lines significant masses of calc-tufa has been deposited from former springs.
More than 65% of the region is covered by loess which can reach a thickness of 25 m near the Danube River.
In the Gerecse Mountains there are several hundred karst caves, but only six caves of non-karstic origin are known. The Angyal-forrás Cave at Tata was formed by weathering and corrasion in carbonateous sandstone and conglomerate. The 80 m long Büdös-lyuk has formed in Eocene sandstone near the village of Bajót.. The Calc-tufa Cave at Eötvös High-School in Tata, The Feszty Cave and the Kő-hegyi Calc-tufa Cave in Mogyorósbánya were formed by syngenetic cave development during tufa deposition and by the weathering of the calc-tufa.
The Neszmély Loess Cave has been formed in the loessial cover of Mount Pap as result of weathering and rock fragmentation.
The total length of the six non-karstic caves is about 215 m. The length of the Calc-tufa Cave at Eötvös High-School is uncertain, because the cave has been filled in.