Klučná - kambrický lahar
General Characteristics
County (administration):
Středočeský kraj
District (town):
Rakovník
Village:
Roztoky
Cadastre:
Roztoky u Křivoklátu
Map sheets:
12-32 Zdice, 12-322 Hudlice
Accessibility:
no traffic restriction ( by car)
ID:
3889
Geology
Short characteristics of the site:
This locality is formed of a cliff wall overlooking Klučnábrook. The locality is of an Upper Cambrian age and belongs to the Příbram-Jince Basin.
The outcrop consists of a mixture of reddish and violet fragments as large as 30 cm, across. Their composition corresponds to andesites and dacites. Clasts are mostly subrounded. As to their origin this section can be taken for a deposition from debris flows. Their sources could be find in the centre of volcanic aktivity. So, it can be assumed that the wall was formed by the activity of Cambrian lahars.
Regional geologic unit:
Bohemian Massif > Bohemicum > Barrandien > Příbram - Jince Basin
Stratigraphy:
Upper Cambrian
Subject:
volcanology
Geological phenomenon:
lahar
Genesis:
volcanic
Rock:
agglomerate
Territorial protection
Level of protection:
Interesting geological localities in Protected landscape area
Part of LEPA (Large-size especially protected areas):
Křivoklátsko
Part of national geopark:
Barrandien
Conflicts of interests:
without conflicts
References
- Vorel, T., red. (2012): Základní geologická mapa České republiky 1 : 25 000 s Vysvětlivkami 12-322 Hudlice. Česká geologická služba. Praha.
Elaboration and Updating
Elaborated by:
Pavla Gürtlerová, 15.10.2015
Updated by:
Vorel Tomáš, 15.12.2015, Kukal Zdeněk, 18.09.2017
Citation
The database Important geological localities of the Czech Republic: 3889 [online]. Prague: Czech Geological Survey, 1998 [cit. 2023-06-16]. Available from: https:// lokality.geology.cz/3889.
Location in map:
Assessment
Scientifical assesment:
medium
Educational assesment:
middle
Significance:
regional
Representativeness:
middle
Geological importance:
significant study profile, geo-regional value (mapping)
Excursion locality:
yes
Locality conditions:
acceptable
You can send information about a change in the status of the site to lokality@geology.cz