Flygodend, kildevand og jernbakterier

Source: Jan Rymenams

Description

Denne lille sti fører os lige til Kalvariebjerget. Hvis du kigger godt efter, kan du se en ensom fyr stå her. Dette er en spontant vokset fyr, og derfor kaldes den også flyft fyr: frøene er blåst vesther til. Nogle gange kan sådan et træ udvikle sig smukt i alle retninger.

I nærheden ser vi noget, der ligner en lille sø. Vandet er rustbrunt, og der flyder en olieagtig film på overfladen. Det ser ud til at være olie, men når vi stikker en stok i det, falder filmen fra hinanden i mangekantede former og klistrer ikke sammen som olie.

Disse er jernbakterier, der sørger for, at jernet i vandet oxideres. Disse bakterier har naturligvis brug for jern, men de kan kun udvikle sig i stillestående vand, der kommer op fra jorden. Dette kaldes 'kildevanding'. Sandsynligvis bliver vandet her drænet fra højere op og følger den uigennemtrængelige Diestianske jernsandbanke, som Kalvariebjerget består af, indtil det næsten åbenlyst eksponerer sig på skråningen mod det fri.

Source

Source: Jan Rymenams

Translated by OpenAI

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Source: Jan Rymenams

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Source: Jan Rymenams

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