General Characteristics

County (administration): Plzeň Region
District (town): Rokycany
Cadastre: Skořice v Brdech
Map 1 : 50 000 (sheet No): 2212, 22121
Geological region: Barrandian Proterozoic; Tisá and Čistá-Jesenice massifs
ID : 4159

Geology

Short characteristics of the site: Neoproterozoic silicites (cherts) outcrop in width of only a few m but had striking total length of 1 km. The body of silicite is elongated in the direction of SE – SW. The rocks are resistent to erosion, very often have bizarre shapes and reach heights of up to 10 m. The rock is made up of grey, white to reddish silicite, with brown limonite spots and coatings. The structure of the rocks is brecciated with black and gray-black silicite relics floating in a brighter silicified matrix. Only rarely in brecciated structure is preserved so-called Stromatolithicstructures. It is supposed that the genesis is close to hydrothermal activity connected with neoproterozoic volcanism. The biogenic activity is not excluded in this paleoenvironment.
Regional geologic unit: Bohemian Massif - crystalline complex and pre-Variscian Palaeozoic - Bohemicum (Central Bohemian region) - Barrandien
Stratigraphy: proterozoikum - neoproterozoikum (1000 - 542 Ma)
Subject: geomorphology, geology, history
Geological phenomenon: horizontal section
Genesis: chemogenetic
Rock: silicite

Territorial conservation

Level of protection: Registred geological localities suggested to protection in Protected landscape area
Protection of a geol. phenomenon: B - Geological phenomenon is the reason for a recommendation to the protection
Part of LEPA (Large-size especially protected areas): CHKO (Protected landscape area) - Brdy
Part of the Geopark: Barrandien
Conflicts of interests: forestry, vegetation

References

Stárková et al. (2019): Vysvětlivky k Základní geologické mapě 1 : 25 000 list 22-121 Mirošov. MS Archiv ČGS.; HAJNÁ, J. – ŽÁK, J. – KACHLÍK, V. – DÖRR, W. – GERDES, A. (2013): Neoproterozoic to early Cambrian Franciscan-type mélanges in the Teplá–Barrandian Unit, Bohemian Massif: evidence of modern-style accretionary processes along the Cadomian active margin of Gondwana? – Precambr. Res. 224: 653–670.; HAJNÁ, J. – ŽÁK, J. – DÖRR, W. – KACHLÍK, V – SLÁMA, J. (2018): New constraints from detrital zircon ages on prolonged, multiphase transition from the Cadomian accretionary orogen to a passive margin of Gondwana. – Precambrian Research,Volume 317,159–178.; STÁRKOVÁ, M. – HALODOVÁ, P. – MRÁZOVÁ, Š. (2018): Geneze neoproterozoických silicitů (buližníků) s tzv. stromatolitovými texturami na území Brd. – Zpr. geol. Výzk. 51, 57–62.

Elaboration and Updating

Elaborated by: Stárková Marcela, 07.08.19

Citation

The database Significant geological localities of the Czech Republic: 4159 [online]. Prague: Czech Geological Survey, 1998 [cit. 2024-05-05]. Available from: http:// lokality.geology.cz/4159.

Location in map: