Vlčí hora
Kosí potok
In the deep valley of the Kosí (Kosový) stream west of the village stand phyllites. They are part of the Upper Proterozoic northwest wing Barrandian. It is a weakly metamorphosed shale and greywacke with inserts of black shales and silicites who settled on the bottom of the sea and were starohorního during Cadomian and Variscan orogeny weakly metamorphosed. Local phyllites are characterized by a distinct „fylitickým“ gloss and detail are generally vráskované. Gloss causing minerals chlorite and sericite, therefore call these phyllites as chlorite-phyllites sericitické. Coarsely crystalline position in phyllites consist of quartz. These positions are very fine (less than 1 mm) and fine watch vráskování rocks, which, however, is to be distinguished from the initial bedding former deposits. She disappeared during metamorphosis and was replaced by the so-called foliation. Self vráskování slate positions is caused by the movement of rocks to subduction zone, as well as metamorphosis itself. It is very likely that the subduction zone was located somewhere in the area of the Czech quartz wall. The phyllites are common and bed position lenticular shape, which consist of quartz, feldspar and albite. In addition to sericite phyllites and chlorite are also sometimes appears pale greenish biotite and albite fine. In dark wrinkled positions occurs as finely dispersed graphite. Along with the graphite rarely found in these positions and finely dispersed pyrite. Graphite and pyrite us indicate that the original rock contained more biogenic matter and show that our Proterozoic sea was lifeless. Towards silver also occur rovnoploše zbřidličnatělé phyllites, which are characterized by parallel, nevráskovanými surfaces. These phyllites are very often used as roofing material.
On the slope above the creek Třebel castle stood in its place has been preserved large baroque granary.
