Prackov
General Characteristics
County (administration):
Liberecký kraj
District (town):
Semily
Village:
Mírová pod Kozákovem
Cadastre:
Vesec pod Kozákovem
Map sheets:
03-32 Jablonec nad Nisou, 03-324 Turnov
Accessibility:
no traffic restriction ( by car)
ID:
3203
Geology
Short characteristics of the site:
The volcanic deposits of the Prackov volcano are exposed by several outcrops on its slopes. Significant depression on the top of the hill represents remnant of a crater. The basal pyroclasticks exposed in the stream are intensively fragmented (the grain-size varies about 1 cm) rich in xenoliths of Cretaceous sediments. These fine-grained pyroclastics were produced during initial phreatomagmatic phase of the volcanic activity. Upwards, the grain size of pyroclastic deposits increases and xenolith content decreases. The pyroclastic deposits are dominated by vesicular sciria fragments with spindle-shaped bombs. Some bombs enclose peridotite xenoliths. The upper pyroclastics correspond to Strombolian type of volcanic eruption. The lava of Prackov volcano has been dated to 4,92 Ma (K/Ar: Cajz et al. 2009).
Regional geologic unit:
Bohemian Massif > Tertiary > Tertiary - scaterred relics of alkaline Volcanics
Stratigraphy:
Tertiary
Subject:
volcanology
Geological phenomenon:
outcrop, cinder cone, lava
Genesis:
volcanic
Rock:
pyroclastic deposits
Territorial protection
Level of protection:
Interesting geological localities in Protected landscape area
Part of LEPA (Large-size especially protected areas):
Český ráj
Part of national geopark:
Bohemian Paradise
Conflicts of interests:
without conflicts
References
- Raprrich, V., red. (2011): Základní geologická mapa České republiky 1 : 25 000 s Vysvětlivkami 03-324 Turnov. - Česká geologická služba. Praha.
- CAJZ, V. – RAPPRICH, V. – SCHNABL, P. – PÉCSKAY, Z. (2009): Návrh litostratigrafie neovulkanitů východočeské oblasti. – Zprávy geol. výzk. v roce 2008, 9–14
Elaboration and Updating
Elaborated by:
Vladislav Rapprich, 14.07.2010
Updated by:
Rapprich Vladislav, 08.11.2011
Citation
The database Important geological localities of the Czech Republic: 3203 [online]. Prague: Czech Geological Survey, 1998 [cit. 2023-06-16]. Available from: https:// lokality.geology.cz/3203.
Location in map:
Assessment
Scientifical assesment:
great
Educational assesment:
major
Significance:
national
Representativeness:
major
Geological importance:
significant study profile, geo-regional value (mapping), geoturistic value
Locality conditions:
no problems
You can send information about a change in the status of the site to lokality@geology.cz
