The cryoplanation forms arose during the Pleistocene ice ages, typically in the high zone of the mountains. At temperatures around the freezing point, with the repetition of freezing and thawing, the water penetrating the cracks of the bedrock exposed to the surface and then freezing there cracked the volcanic material. As a result of the fragmentation caused by the frost, rock walls and rock towers were formed over time on the mountain peaks and steep mountain sides. The smaller and larger pieces of rock detached from the walls were partly piled up in the foreground of the rocks, and partly on the slopes of the mountains and at the bottom of the valleys they form a thinner or thicker blanket of debris, the so-called stone field. The most beautiful forms of cryoplanation in our country are in the Zemplén Mountains, as the plate-like andesite rock occurring in many places in the roof region favored the process. Among the most beautiful formations, the tourist routes touch, for example, Sólyom-bérce, Nagy-Péter-mennykö, Szkalka-szika, Hejce's Sólyom-kö and Nagy-Amadé-hegy.
An old note says:
"Pengő-kő is a 743-meter-high jutting boulder, from its top you can enjoy a picturesque view of the surrounding countryside, from the castle ruins in Regéc to Nagy-Milic. Everywhere you look, you can only see forest-covered mountains..... we are in the heart of Zemplén..." (Gábor Szerényi) ...It was a long time ago....