General Characteristics

County (administration): Moravia-Silesian Region
District (town): Ostrava-město
Cadastre: Poruba
Map 1 : 50 000 (sheet No): 1543, 15431
Geological region: Quaternary - region of continental glaciation, Žitava & Vidnava basins; Osoblaha Cretaceous
Accessibility: - no traffic restriction ( by car)
ID : 2362

Geology

Short characteristics of the site: Quaternary, areas of continental glaciation. The second largest, but longest erratic boulder in the Czech Republic. It was found within fluvioglacial sands in a brook bed in the Poruba City, now it is placed on a pedestal nearby. It consists of a coarse grained porphyric granite (granitoid) with potessium feldspar phenocrysts as large as 1 - 2 cm, common rock forming minerals and numerous blackish aggregates of dark minerals. This erratic boulder comes from the Baltic Shield.
Regional geologic unit: Bohemian Massif - superficial deposits and post-Variscian magmatites - Quaternary - Quaternary of deposition areas of Bohemian Massif
Stratigraphy: kenozoikum - kvartér
Subject: geomorphology, petrology, quaternary geology
Geological phenomenon: erratics
Genesis: glacigenic (glacier activity)
Rock: granite

Territorial conservation

Level of protection: Nature monument
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 Locality)
Conflicts of interests: without conflicts

References

Weissmannová H. a kol (2004): Ostravsko. In: Mackovčin P. a Sedláček M.(eds.): Chráněná území ČR, svazek X. Agentura ochrany přírody a krajiny ČR a EkoCentrum Brno, str.290 Praha.;Výpověď pamětníka vyzdvižení na http://www.vesmir.cz/clanek/porubske-eratikum

Elaboration and Updating

Elaborated by: Jirková Pavlína, 01.03.10
Updated by: Malík Jan 18.08.11, Malík Jan 18.08.11, Kukal Zdeněk 29.12.12

Citation

The database Significant geological localities of the Czech Republic: 2362 [online]. Prague: Czech Geological Survey, 1998 [cit. 2024-05-06]. Available from: http:// lokality.geology.cz/2362.

Location in map: