General Characteristics

County (administration): Central Bohemia Region
District (town): Kladno
Cadastre: Braškov
Map 1 : 50 000 (sheet No): 1223, 12233
Geological region: Czech Cretaceous Basin - Velim, Praha, Roudnice and Ohře Cretaceous
Accessibility: - no traffic restriction ( by car)
ID : 3785

Geology

Short characteristics of the site: This locality displays a series of outcrops above a road cut. The outcropes expose a contact between the Neoproterozoic silicites (ůydites) and overlying Cretaceous sediments. The Cretaceous sediments contain carbonate admixture and are fossil-bearing, with foraminifers and sponge spicules, rich in ichnofossils. In places they can ber called spomngiolites. The Cretaceous siltstones sometimes pass even into limestones, often they can be called "opuka". The silicites are fractured, sometimes strongly oxidized. In surroundings blocks of silicites they occur, possibly evidences activity of breaking waves of the Cretaceous sea. The silicites belong to the Neoproterozoic Kralupy-Zbraslav Group, the Cretaceous form part of the Bohemian Cretaceous Basin.
Regional geologic unit: Bohemian Massif - crystalline complex and pre-Variscian Palaeozoic - Bohemicum (Central Bohemian region) - Barrandien, Bohemian Massif - superficial deposits and post-Variscian magmatites - Cretaceous - Czech Cretaceous Basin
Stratigraphy: mezozoikum - křída - svrchní křída, proterozoikum - neoproterozoikum (1000 - 542 Ma)
Subject: geology, stratigraphy, lithology
Geological phenomenon: lithological boundary, transgression
Genesis: sedimentary
Rock: opuka (aranaceous marlstone), lydite

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: road construction

References

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

Elaboration and Updating

Elaborated by: Čáp Pavel, 11.09.14
Updated by: Kukal Zdeněk 25.09.17, Kukal Zdeněk 26.09.17

Citation

The database Significant geological localities of the Czech Republic: 3785 [online]. Prague: Czech Geological Survey, 1998 [cit. 2024-05-01]. Available from: http:// lokality.geology.cz/3785.

Location in map: