česky english deutsch polski <<< >>>

Natural monuments Moravian

Natural Monument of Lava Flow at Mezina

Basic information

The natural monument consists of stone folding in the area of a former quarry. This unusual stone structure was created by a stream of lava from Venus volcano. The area of the old quarry is partially covered by over-grown trees. In exposed areas there is a clearly visible columnar cleat of mined olivine basalt. It was declared a natural monument in 1997. It stretches over 1.22 ha.

Subject of protection

Venus volcano outcrop with a well-developed columnar and globular trapping of plagioclastic basalt and abundant olivine phenocysts.


The site is particularly interesting for its well-developed columnar trapping which is typical for basaltic rocks. The columns of several decimetres in diameter are characterised by hexagonal or sometimes pentagonal cross-section. In some parts we can see a noticeable bank trapping perpendicular to the columnar one. The rock disintegrates in the weathering zone at the surface while globural boulders are created. The less frequent form is fabaceous basalts whose size reaches merely several centimetres. The abandoned quarry sprouts with pioneer trees such as White Birch (Betula pendula) and Goat Willow (Salix caprea). Polish Larch (Larix decidua) is abundant in here. In order to preserve the geological profile the woody plants are reduced in this area.

Lávový proud

Lávový proud

Lávový proud u Meziny

Lávový proud u Meziny

Useful information


Krajský úřad Moravskoslezského kraje, odbor životního prostředí a zemědělství 28. října 117, 702 18 Ostrava www.kr-moravskoslezsky.cz tel.: +420 595 622 297

GPS position

N 49° 57.404', E 17° 29.251'



Krajský úřad Moravskoslezského kraje
Odbor životního prostředí a zemědělství
28. října 117, Ostrava
Tel.:+420 595 622 297