Zábrdský kopec - extruzivní část
General Characteristics
County (administration):
Liberecký kraj
District (town):
Liberec
Village:
Osečná
Cadastre:
Zábrdí u Osečné
Map sheets:
03-31 Mimoň, 03-312 Všelibice
Accessibility:
access without footpath
ID:
3401
Geology
Short characteristics of the site:
The locality displays an outcrop and surrounding blocky scree. The volcanics are exposed forming a part of well known morphological and petrological phenopmena. This described locality forms an extrusive part of the volcanic ridge called "Čertova zeď - the Devil´s Wall". The depression in this ridge resembles a maar but is without lacustrine sediments. Only pyroclastic deposits occur being surrounded by compacted Cretaceous sediments of the Jizera Formation. The whole ridge represents in fact dyke of polzenite. The rock is transected by calcite veins, contains phenocrysts of biotite and possibly also of wollastonite. The rock is intensively weathered in places where iron oxide nodules were formed. Regionallly this locality belongs to the disseminated alkali volcanics of the Bohemian Massif.
Regional geologic unit:
Bohemian Massif > Tertiary > Tertiary - scaterred relics of alkaline Volcanics
Stratigraphy:
Tertiary, Upper Cretaceous
Subject:
volcanology, petrology
Geological phenomenon:
dyke, volcaniclastic deposits, characteristic rock
Genesis:
volcanic
Rock:
polzenite
Territorial protection
Level of protection:
Registered geological localities suggested for protection
Conflicts of interests:
without conflicts
References
- PALUSKA, Antonín & VESELÝ, Pavel (2010): Návrh na rozšíření chráněné oblasti Národní přírodní památky „Čertova zeď“ v severních Čechách (Český Dub-Osečná) a vytvoření chráněné oblasti „Velká Čertova zeď“.- 2. vulkanologický seminář odborné skupiny vulkanologie České geologické společnosti v Teplicích,Speciální publikace Regionálního muzea v Teplicích, str. 35-36
Elaboration and Updating
Elaborated by:
Pavla Gürtlerová, 07.02.2012
Updated by:
Gürtlerová Pavla, 24.03.2014, Kukal Zdeněk, 25.09.2017, Krejčí Zuzana, 26.09.2017, Vajskebrová Markéta, 29.09.2021
Citation
The database Important geological localities of the Czech Republic: 3401 [online]. Prague: Czech Geological Survey, 1998 [cit. 2023-06-16]. Available from: https:// lokality.geology.cz/3401.
Location in map:
Assessment
Scientifical assesment:
great
Educational assesment:
major
Significance:
supraregional
Representativeness:
middle
Geological importance:
geo-regional value (mapping)
Locality conditions:
acceptable
You can send information about a change in the status of the site to lokality@geology.cz
