Tafoni

crickleymal

New member
I saw an article in an archaeological group about a standing stone with tafoni. The state be was limestone iirc. Not having heard of the term before I looked it up. It struck me that the appearance was quite similar to the crease limestone that you get in the Forest of Dean. But it seems unlikely to be the same due to the amount of crease limestone? Anyone care to enlighten me?
https://en.m.wikipedia.org/wiki/Tafoni
 

Brains

Well-known member
Also loosely termed boxwork or laticing, but these are found in finely veined rock that has etched out. Visually similar but different mechanisms? The tafoni can be marine or fresh water from what I have seen. It seems to be related to the breakdown of a surface skin of hard, weathered rock, allowing a core to erode out. Curious and picturesque
 

pwhole

Well-known member
Is that this stuff? Photographed under a ledge of bedrock (lying on my back with a wide-angle lens) somewhere near Calver.
 

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Brains

Well-known member
That's the lattice / boxwork type, with small resistant veins around more soluble host material. Typical of mineralised rocks or ones that have been subjected to a lot of stress. True tafoni is more well rounded on or in the surface of a weathered surface
 

AR

Active member
yes, from recollection of looking at the same bit of rock (in fact, I think it was there at the time the photo was taken) the proud bits are calcite/fluorite stringers that have resisted the erosion of the host rock.
 
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