Česká geologická služba
Geological localities
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General Characteristics

County (administration): Liberec Region
District (town): Jablonec nad Nisou
Cadastre: Jizerky
Map 1 : 50 000 (sheet No): 0323, 03231
Geological region: Lužice Pluton and Krkonoše-Jizera Massif; Krkonoše-Jizera crystalline complex
Accessibility: - access without footpath
ID : 3685


Short characteristics of the site: Thie locality is called "Houba - the Mushroom" because of its solitary position and shape. The rock can be classified as the biotite granite of the Jizera type. It contains numerous potassium feldspar phenocrysts and aggregates of biotite called "the schliers". The rock is a product of frost weathering with an intensive glacial erosion. Sometimes such rocky features are called tors.This type of typical for the Krkonoše-Jizera crystalline.
Regional geologic unit: Bohemian Massif - crystalline complex and pre-Variscian Palaeozoic - Lugicum - Magmatites of Lugicum
Stratigraphy: paleozoikum
Subject: geomorphology, petrology
Geological phenomenon: mushroom rock, selective erosion, tor
Genesis: magmatic, frost weathering
Rock: granite

Territorial conservation

Level of protection: Interesting geological localities in Protected landscape area
Protection of a geol. phenomenon: B - Geological phenomenon is the reason for a recommendation to the protection
Part of LEPA (Large-size especially protected areas): CHKO (Protected landscape area) - Jizerské hory
Conflicts of interests: without conflicts


Mrázová Š. , Verner. K., red. (2012): Základní geologická mapa České republiky 1 : 25 000 s Vysvětlivkami 03-142 Hejnice a 03-231 Jizerka. - Česká geologická služba. Praha.

Elaboration and Updating

Elaborated by: Verner Kryštof, 21.05.13
Updated by: Kukal Zdeněk 18.09.17


The database Significant geological localities of the Czech Republic: 3685 [online]. Prague: Czech Geological Survey, 1998 [cit. 2023-12-08]. Available from: http:// lokality.geology.cz/3685.

Location in map:

Links to neighbouring localities within 2 km radius are available on mouse click in the map window.
Solitérní skála  - erozní relikt mrazového zvětrávání  v porfyrickém granitu (jizerský typ)., Markéta Vajskebrová, 2017
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(C) 2003-2012 ČGS, verse aplikace 1.21 [3.2.2016]