General Characteristics

County (administration): Liberec Region
District (town): Semily
Cadastre: Rváčov
Map 1 : 50 000 (sheet No): 0343, 03431
Geological region: Permo-Carboniferous of the Krkonoše-piedmont and Lower Silesian basins
Accessibility: - passable footpath
ID : 291

Geology

Short characteristics of the site: Natural outcrop on the hill summit. Andesite contains numerous vesicles filled with chalcedony, agate and quartz aggregates (also amethyst and smoky quartz). Mineralogically interesting locality.
Regional geologic unit: Bohemian Massif - superficial deposits and post-Variscian magmatites - Upper Carboniferous and Permian - Permocarboniferous Volcanits
Stratigraphy: paleozoikum - perm
Subject: mineralogy, geology, geomorphology
Geological phenomenon: lava, mineral
Genesis: volcanic
Rock: basalt

Territorial conservation

Level of protection: Registered interesting geological localities
Protection of a geol. phenomenon: C - Geological phenomenon is the reason for a registration in the database of CGS
Part of the Geopark: Bohemian Paradise
Conflicts of interests: vegetation, waste disposal

References

Gotthardt J./1933/: Petrografická povaha podkrkonošských melafyrů.-APPVČ,18,2,65 p.Praha. Ziegler V./1977/: Geologické poměry chráněné krajinné oblasti Český ráj.-Bohemia centralis,6,p.7-42.Praha. Ziegler V./MS/: Geologické zajímavosti Českého ráje.-Pečky.

Elaboration and Updating

Elaborated by: Ziegler Václav, 10.11.93
Updated by: Prouza Vladimír 18.03.03, Stárková Marcela 15.11.11

Citation

The database Significant geological localities of the Czech Republic: 291 [online]. Prague: Czech Geological Survey, 1998 [cit. 2024-04-25]. Available from: http:// lokality.geology.cz/291.

Location in map: