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Třetihorní subtropy

Quartzite boulders at Habartov

After the coal mining period in the Western part of Sokolov Basin, the extensive revitalization of the landscape has begun. The big open pit mine Medard-Libík at South of Habartov is going be changed in to the big lake (“Lake Medard”), and the whole area will is expected to become an important recreational destination.

The biggest boulder is 7 m long and over 200 tons weight

One of the interesting geosites in surroundings of the city is situated on the northern margin of the original Tertiary basin, where nowadays the relicts of the Paleogene sediments of Staré Sedlo formation occur. During the warm and humid clime in Paleogene, the primarily loose sand and gravel were penetrated by siliceous solutions with the formation of quartzite.

Pothole with a water groove

The quartzite layers were later eroded (see the pseudocarst localities Údolí Ohře Sedlo and Svatava) and free blocks of the hardest sections were exposed on the Earth’s surface. The wind and water erosion resulted into the typical glassy, cavitated face of the blocks. For their yellowish colour and velvety look such quartzite boulders are called “sluňáky” (“sunstones”).

Silica conglomerate

GPS position

N 50° 11.315', E 12° 33.103'