Concreations

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Offline sfarrell

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Concreations
« on: 22/02/2007 15:54:15 »
Can anyone tell me anything about limestone concreations?  How are they made and what is interesting about them?

Thanks

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Offline daveshorts

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Concreations
« Reply #1 on: 22/02/2007 17:23:26 »
From a long past geology course:
Limestone is quite soluble in water, so if water flows through limestone it will dissolve some limestone. If the conditions change slightly - cool down, some water evaporates etc, this limestone can then come out of solution. This will preciptiate on anything handy, in a cave this can cause the creation of cool features like stalagmites and stalagtites, however the same thing is happening in some gravel, some soil or a rock fall, it will precipitate on the lumps, sticking them together, creating a concretion.

I am not sure what you are looking for in the interesting stakes, and there are probably more subtleties than this, I await with interest.