General Characteristics

County (administration): Central Bohemia Region
District (town): Kladno
Cadastre: Kladno
Map 1 : 50 000 (sheet No): 1223, 12233
Geological region: Barrandian Proterozoic; Tisá and Čistá-Jesenice massifs
Accessibility: - access without footpath
ID : 3779

Geology

Short characteristics of the site: The locality is represented by morphologically prominent ridge with small surrounding outcrops. It belogs to the Barrandian area and stratigraphically to the Upper Cambrian of the Příbram-Jince Basin. A series of small abandoned quarries exposes subvolcanic massive grey up to pink rhyolite. Porphyric texture with some quartz phenocrysts is typical for this rock. Fine grained ground mass consists a a mixture of quartz feldspars, muscovite and sericite. This rhyolite was formerly quarried and utilized for buildng purposes.
Regional geologic unit: Bohemian Massif - crystalline complex and pre-Variscian Palaeozoic - Bohemicum (Central Bohemian region) - Barrandien
Stratigraphy: paleozoikum - kambrium - svrchní kambrium
Subject: geology, geomorphology, volcanology
Geological phenomenon: characteristic rock, rock bag
Genesis: volcanic
Rock: rhyolite

Territorial conservation

Level of protection: Interesting geological localities in Protected landscape area
Protection of a geol. phenomenon: C - Geological phenomenon is the reason for a registration in the database of CGS
Part of LEPA (Large-size especially protected areas): CHKO (Protected landscape area) - Křivoklátsko
Conflicts of interests: forestry, vegetation

References

M.Stárková et al. (2014): Vysvětlivky ke geologické mapě 12-233 list Unhošť. - MS Archív ČGS Praha.; TOULA, J. (1969): Závěrečná zpráva kladensko, surovina: kámen. – MS Čes. geol. služba – Geofond. Praha.; Vidal et al. (1975):Radiometric age of volcanics of the Cambrian Křivoklát-Rokycany complex (Bohemian Massif). Geol. Rundsch. 64, 2, 563–570.;ŽÁK, J. – KRAFT, P. – HAJNÁ, J. (2013): Timing, styles, and kinematics of Cambro–Ordovician extension in the Teplá–Barrandian unit, Bohemian Massif, and its bearing on the opening of the Rheic Ocean. – International Journal of Earth Sciences, 102: 415–433.; Drost et al. (2004):New data on the Neoproterozoic–Cambrian geotectonic setting of the Teplá–Barrandian volcanosedimentary successions: geochemistry, U–Pb zircon ages, and provenance (Bohemian Massif, Czech Republic). – Int. J. Earth. Sci. 93: 742–757.

Elaboration and Updating

Elaborated by: Stárková Marcela, 22.08.14
Updated by: Gürtlerová Pavla 21.10.15

Citation

The database Significant geological localities of the Czech Republic: 3779 [online]. Prague: Czech Geological Survey, 1998 [cit. 2024-04-30]. Available from: http:// lokality.geology.cz/3779.

Location in map: