General Characteristics

County (administration): Liberec Region
District (town): Semily
Cadastre: Hrubá Skála
Map 1 : 50 000 (sheet No): 0334, 03342
Geological region: Czech Cretaceous Basin - Labe & Čáslav Cretaceous; Cretaceous of the Dlouhá mez
Accessibility: - no traffic restriction ( by car)
Excursion locality: yes
ID : 3228

Geology

Short characteristics of the site: Bohemian Cretaceous Basin. Part of the Hrubá Skála rock city (castellated sandstones), belonging to the area of the UNESCO Geopark. Depositional history can be seen on a cliff section. Two sandstone bodies of deltaic origin are separated by transgressional plane covered by residual gravel. Several types of current bedding can be observed. Herring-bone bedding is possibly of tidal origin. This locality is classified as a Nature Reserve in the Protected Landscape Area Český ráj - the Bohemian Paradise.
Regional geologic unit: Bohemian Massif - superficial deposits and post-Variscian magmatites - Cretaceous - Czech Cretaceous Basin
Stratigraphy: mezozoikum - křída - svrchní křída
Subject: geomorphology, sedimentology
Geological phenomenon: rock, bedding, unconformity
Genesis: sedimentary
Rock: sandstone

Territorial conservation

Level of protection: Nature reserve in Protected landscape area
Additional information: See the Digital register of the Agency for Nature Conservation and Landscape Protection of the Czech Republic AOPK ČR
Protection of a geol. phenomenon: A - Protected Area (declared as Geological and Biological Locality)
Part of LEPA (Large-size especially protected areas): CHKO (Protected landscape area) - Český ráj
Part of the Geopark: Bohemian Paradise
Conflicts of interests: tourism

References

Čech, S., et.al. (2011): Základní geologická mapa České republiky 1 : 25 000 s Vysvětlivkami 03-342 Rovensko pod Troskami. - Česká geologická služba. Praha.; ULIČNÝ, D. (2001): Depositional systems and sequence stratigraphy of coarse-grained deltas in a shallow marine, strike-slip setting: the Bohemian Cretaceous Basin, Czech Republic. – Sedimentology, 48, 599–628. ; ULIČNÝ, D. – ČECH, S. – GRYGAR, R. (2003): Day 2. Tectonics and Depositional Systems of a Shallow-Marine, Intra-Continental Strike-Slip Basin: Exposures of the Český ráj Region, Bohemian Cretaceous Basin. Excursion Guide. 8th Meeting of the Czech tectonic Studies Group. Hrubá Skála Chateau, Czech Republic, April 24-27, 2003. – Geolines, 16, 133–148.

Elaboration and Updating

Elaborated by: Čech Stanislav, 15.07.10
Updated by: Čech Stanislav 12.11.11, Kukal Zdeněk 26.11.12, Kukal Zdeněk 21.12.17

Citation

The database Significant geological localities of the Czech Republic: 3228 [online]. Prague: Czech Geological Survey, 1998 [cit. 2024-04-24]. Available from: http:// lokality.geology.cz/3228.

Location in map: