General Characteristics

County (administration): Ústí nad Labem Region
District (town): Louny
Cadastre: Petrohrad
Map 1 : 50 000 (sheet No): 1213, 12133
Geological region: Barrandian Proterozoic; Tisá and Čistá-Jesenice massifs
Accessibility: - passable footpath
Excursion locality: yes
ID : 3523

Geology

Short characteristics of the site: Magmatites, Western Bohemia. Natural outcrops of medium grained biotite granodiorite of so called "Petrophrad type". Biotite aggregates in bands and lenses are typical for this rock, as possible evidence of an impact of metamorphic processes. Potassium feldspar phenocrysts also occur. Ŕadiometric age of this granodiorite is 488 plus minus 24 mil. years.
Regional geologic unit: Bohemian Massif - crystalline complex and pre-Variscian Palaeozoic - Bohemicum (Central Bohemian region) - Magmatites in Bohemicum
Stratigraphy: paleozoikum - kambrium
Subject: geology, geomorphology, petrology, structural geology
Geological phenomenon: deformation fabrics, intrusion, frost cliff, rock bag, rock salient, cliff, outcrop
Genesis: magmatic, frost weathering
Rock: granodiorite

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
Conflicts of interests: without conflicts

References

Breiter,K.(2003):Granitoidy tiského masivu.- Zpr. o geol.výzk.,13 - 16. Praha.; Seifert A., red. (2012): Základní geologická mapa České republiky 1 : 25 000 s Vysvětlivkami 12-133 Jesenice. Česká geologická služba. Praha.

Elaboration and Updating

Elaborated by: Štěpánek Petr, 03.05.12

Citation

The database Significant geological localities of the Czech Republic: 3523 [online]. Prague: Czech Geological Survey, 1998 [cit. 2024-05-02]. Available from: http:// lokality.geology.cz/3523.

Location in map: