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: - no traffic restriction ( by car)
Technical object: guarry
Excursion locality: yes
ID : 3780

Geology

Short characteristics of the site: Still active quarry with two levels in which massive fine grained basalt is exploited. It belongs to the Blovice Formation of Kralupy-Zbraslav Group of the Barrandian Neoproterozoic. Described basalt is often called "spilite". Its lower parts are massive and fresh, uppermost parts already weathered. In some parts typical pillow lava structures occur, sometimes patches which resemble devitrificationm process. Spilites display microoffitic texture and contain albitized feldspars with Mg-Pumpellyite. In marginal parts of the quarry a contact with Neoproterozoic sediments, schists and metagreywackes, can be observed.
Regional geologic unit: Bohemian Massif - crystalline complex and pre-Variscian Palaeozoic - Bohemicum (Central Bohemian region) - Barrandien
Stratigraphy: proterozoikum - neoproterozoikum (1000 - 542 Ma)
Subject: geology, volcanology, structural geology
Geological phenomenon: characteristic rock, lava
Genesis: volcanic , sedimentary
Rock: spilite, black shale

Territorial conservation

Level of protection: Registered geological localities suggested for protection
Protection of a geol. phenomenon: B - Geological phenomenon is the reason for a recommendation to the protection
Conflicts of interests: open cast mining

References

M.Stárková et al. (2014): Vysvětlivky ke geologické mapě 12-233 list Unhošť. - MS Archív ČGS Praha.

Elaboration and Updating

Elaborated by: Stárková Marcela, 22.08.14

Citation

The database Significant geological localities of the Czech Republic: 3780 [online]. Prague: Czech Geological Survey, 1998 [cit. 2024-04-26]. Available from: http:// lokality.geology.cz/3780.

Location in map: