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Vlčí hora

Vlčí hora

The Vlčí hora mountain (704 m), rising above the township Černošín, forms an aerially large volcanic body with roughly 1,5×2,5 km in size, which overlays tertiary clays and sands deposited on weathered phyllites. Vlčí hora formed 12 million years ago during Tertiary in relation to rejuvenation of faults and volcanic activity in the Cheb-Domažlice graben. It is built by basanite to olivine nephelinite, i.e. simplified by basalt, and its tuffs. Above the surrounding terrain with altitude not greater than roughly 550 m lies an elevated plateau with altitude 600–630 m, which consists of basalt and represents a lava-flow relict. The lavas are best exposed in a moat of the tower Volfštejn, where they formed columns typical for basaltic jointing. The columns are oriented vertically, and so they correspond to horizontally deposited lava. Above this plateau protrudes up to the altitude 680 m Vlčí hora, formed by basaltic slags, which are formed by fragments of highly porous basalt. Vlčí hora constitutes relict of a slag cone, which formed by accumulation of volcanic slag during Stromboli type eruptions. This kind of eruptions is termed after the volcano Stromboli in Aeolian Islands, they use to be „spectacular and noisy“. Glowing lava is ejected upwards and usually falls back into the crater's surrou­ndings. The top of Vlčí hora in altitude up to 704 m is formed by a peak of compact basalt, which is rimmed by slaggy deposits. It represents a vent for the magma supply, which was denudated thank to partial erosion of the volcanic cone. The slag cones represent the most widespread manifestations of volcanism on the Earth surface. They are characterized by structure of a steep, hundreds to thousands meter wide volcanic cone, which formed above the place where magma ascends to the surface. They belong into the group of monogenetic volcanoes, which are created during a several days to several years lasting activity.

GPS position

N 49° 48.637', E 12° 51.332'