General Characteristics

County (administration): Plzeň Region
District (town): Rokycany
Cadastre: Jablečno
Map 1 : 50 000 (sheet No): 1232, 12323
Geological region: Barrandian Proterozoic; Tisá and Čistá-Jesenice massifs
Accessibility: - access without footpath
Excursion locality: yes
ID : 3748

Geology

Short characteristics of the site: This locality is called "Babí skála - the Old Woman´Rock" and belongs geologically to the Barrandian Neoproterozoic. The rock forms a ridge which is separated by erosion into several cliffs. This rock is formed of silicites with about 98 per cent of silica. A layering can be observed as well as a local brecciated structure. The rock surface is locally covered with limonite patches and films. An admixture of disseminated organic matter caused a deep grey, even black colour of rock. The origin of these silicites is still doubtful.
Regional geologic unit: Bohemian Massif - crystalline complex and pre-Variscian Palaeozoic - Bohemicum (Central Bohemian region) - Barrandien
Stratigraphy: proterozoikum - neoproterozoikum (1000 - 542 Ma)
Subject: geology, geomorphology, petrology
Geological phenomenon: characteristic rock, rock, selective erosion
Genesis: sedimentary
Rock: silicite

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
Part of the Geopark: Barrandien
Conflicts of interests: vegetation

References

T. Vorel et al. (2014): Vysvětlivky k Základní geologické mapě České republiky 1: 25 000 12-323 Podmokly

Elaboration and Updating

Elaborated by: Stárková Marcela, 10.02.14

Citation

The database Significant geological localities of the Czech Republic: 3748 [online]. Prague: Czech Geological Survey, 1998 [cit. 2023-03-24]. Available from: http:// lokality.geology.cz/3748.

Location in map: