Doubrava - U hradu
General Characteristics
County (administration):
Plzeňský kraj
District (town):
Rokycany
Village:
Skořice
Cadastre:
Skořice v Brdech
Map sheets:
22-12 Březnice, 22-121 Mirošov
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 > Bohemicum > Barrandien > Barrandien - Paleozoic > Kralupy - Zbraslav Group
Stratigraphy:
Neoproterozoic
Subject:
geomorphology, geology, history
Geological phenomenon:
horizontal section
Genesis:
chemogenetic
Rock:
silicite
Territorial protection
Level of protection:
Registred geological localities suggested to protection in Protected landscape area
Part of LEPA (Large-size especially protected areas):
Brdy
Part of national 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:
Marcela Stárková, 07.08.2019
Updated by:
Citation
The database Important geological localities of the Czech Republic: 4159 [online]. Prague: Czech Geological Survey, 1998 [cit. 2023-06-16]. Available from: https:// lokality.geology.cz/4159.
Location in map:
Assessment
Scientifical assesment:
medium
Educational assesment:
middle
Significance:
regional
Representativeness:
major
Geological importance:
geo-historical value, geo-regional value (mapping)
Locality conditions:
no problems
You can send information about a change in the status of the site to lokality@geology.cz
