The topographic ridge between the Kaczawa Valley to the west and Leszczyna to the east, built in the upper part of Cretaceous sandstones, takes on a bay-like course east of Wilków. The two prominent spurs are named Prusicka Góra (402 m) to the north and Średnia Góra (427 m) to the south. The harder Cretaceous sandstone occurs near the summit, while lower down, less weather-resistant Triassic sandstones are found.
A natural feature of Prusicka Góra and Średnia Góra are extensive rock debris in the upper sections of the slopes descending eastward. The block cover is compact in places, with blocks either adjoining or even stacked on top of each other. The length of the blocks averages 2–3 meters, but larger elements are quite common. The largest block, below Średnia Góra, is 8 meters long. Within individual blocks, numerous interesting small relief forms can be found. Some are associated with selective weathering. These include caverns, widened fissures, and ‘honeycomb’ structures, while cornices indicate locally greater rock resistance.
Also noteworthy are manifestations of silicification and iron impregnation, indicating the involvement of hydrothermal processes in the transformation of sandstones. Both silica and iron compounds precipitated from hot solutions circulating in the rock, probably during the period when volcanic cones of Trupień and Kozia Góra were forming nearby.
Description: Piotr Migoń
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