General Characteristics

County (administration): Plzeň Region
District (town): Tachov
Cadastre: Okrouhlé Hradiště
Map 1 : 50 000 (sheet No): 1141,1142,1143,1144, 11414,11423,11432,11441
Geological region: Teplá, Tachov, Smrčiny, Svatava, Cheb-Dyleň a Slavkov crystalline complexes, Thüringen - Vogtland Palaeozoic; Karlovy Vary Massif (SE part)
Accessibility: - passable footpath
Technical object: guarry
Excursion locality: yes
ID : 366

Geology

Short characteristics of the site: Abandoned quarry exposing a lava flow formed of the leucitite basanite. Volcanic body lies on kaolinitically weathered phyllites. Lava flow is as much as 50 m thick and exhibits distinct columnar jointing. Petrologically and volcanologically significant. Remnant of a basaniti volcano with effects of slope deformations and breaking by freezing on its margins.
Regional geologic unit: Bohemian Massif - superficial deposits and post-Variscian magmatites - Tertiary - Dispersed Alcalic volcanits
Stratigraphy: kenozoikum - terciér (paleogén - neogén)
Subject: volcanology, petrology, mineralogy, geomorphology, botany, archeology
Geological phenomenon: stony organ, volcaniclastic deposits, frost cliff, rock bag, characteristic rock
Genesis: volcanic
Rock: trachybasalt, trachyte, basaltoid (basaltic-rock)

Territorial conservation

Level of protection: Nature reserve
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 (geology is important aspect of Biological declared Locality )
Conflicts of interests: without conflicts

References

Fediuk, F. (1993): Pokračování výzkumu mladých západočeských vulkanitů. - Zpr. geol. Výzk. v roce 1991, 44-45. Praha. Shrbený, O. (1959): Zpráva o geologickém mapování Hradištského vrchu. - Zpr. geol. Výzk. v roce 1954, 159-160. Praha. Shrbený, O. (1959): Geochemistry of the West Bohemian neovolcanics. - Čas. min. geol., 24, 1, 9-21. Praha.; Zahradnický J., Mackovčin P. a kol.(2005): Plzeňsko a Karlovarsko. In: Mackovčin P. a Sedláček M.(eds.): Chráněná území ČR, svazek XI. Agentura ochrany přírody a krajiny ČR a EkoCentrum Brno, str.461 Praha.; Mergl M., Vohradský O. (2000): Vycházky za geologickými zajímavostmi Plzně a okolí, Koura publising, Mariánské Lázně.

Elaboration and Updating

Elaborated by: Cajz Vladimír, Vrána P., 06.12.93
Updated by: Plíšek Antonín 05.04.05, Rapprich Vladislav 21.09.09, Gürtlerová Pavla 01.08.10, Vajskebrová Markéta 12.08.21

Citation

The database Significant geological localities of the Czech Republic: 366 [online]. Prague: Czech Geological Survey, 1998 [cit. 2024-04-26]. Available from: http:// lokality.geology.cz/366.

Location in map: