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Plakanek valley

Tufa waterfall

The overburden the main sand body framed that kind is in the highest part to a succession of rocks of various lithologies including the position siltstones and sandstones. This section presents the transition to Rohatec layers. Even higher on platforms along the valley are preserved even younger marl and calcareous mudstones Březina Formation. They are on the edges of the valley creating numerous tufa body, currently growing rapidly.

Tufa formed when water containing carbon dioxide (CO2) through calcareous clays, which eluted from limestone (CaCO3). After the saturated seepage water occurs to precipitate carbonates. Precipitation takes place most intensively in areas where water invades, aerate and is the largest leaks of CO2. Great impact of the plants, lower (algae, mosses) and higher, which draw water from CO2 and contribute to accelerate clotting and also provide a surface for the precipitation of calcite. Virtually impossible to assess whether the effect of tufa important biogenic processes or simple leakage CO2 naturally (Zak et al. 2001). The intensity of the processes associated with tufa formation depends mainly on the climate-controlled factors. Especially in the CO2 concentration in the soil air infiltration area and precipitation. CO2 concentration in the soil influences such as the amount of organic material, the presence of bacteria and organisms, soil type and temperature.

Tufa formation is fast, so it may happen that in them we find fossilized insects present. Tufa rocks are very fragile, they can be destroyed easily, so please do not touch them, let no violation.

GPS position

N 50° 28.672', E 15° 8.850'



Geopark UNESCO Český ráj
Jiří Vlasák