The impressive Tränenlay consists of tufa. When it rains, carbon dioxide in the atmosphere combines with water to form carbonic acid. When this acid rain falls on calcium-rich rock, such as here at the Tränenlay, the calcium dissolves. This calcium does not remain long at the springs of the Tränenlay, because the carbon dioxide escapes. Due to the turbulence, the calcium is deposited in the form of a crust. Moreover, the moss on the rocks enhances this process, as it extracts carbon dioxide from the water and the calcium settles as a crust on the moss. Thus, over a period of thousands of years, tufa is formed. It is a very light rock with countless cavities and was a popular building material in former times because it was airy, light, yet stable and weather-resistant.
Source: Information board at the rock (photo 3)
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