You often get bits of bark (Ithink it's called) the cambium layer just under
the bark popping up in wood. Looks like this though not usually so specific inshape.
Another possibility is the tree, sometime in its life had a chunk of iron in it.
Nail, or a metal hook perhaps.
Iron reacts with the tannin in oak which turns black, which is why fastenings of brass or aluminium should be used.
Just a thought,,,,,,,,
John
Now that's interesting. I've had exactly the same shape - in a variety of sizes - turn (ha ha) up in both hawthorn and apple....not just one but often several in one piece of wood.
They look very like an arrowhead, some of them with a pronounced stem or shaft as well.
Most of mine have been aligned as if pointing in towards the centre of the wood/tree.
I shall just have to keep my fingers crossed and see what other explanations come in.
Looks too me like it may be a stake , Hammered into the ground when the tree was small to give it some support , them as the tree establish itself and grew , it grew around the support stake
Only my opinion but I cant see any other reason for it :wink:
This piece is one of three which were scrounged off a tree surgeon by a relative. Judging my the mess left on my tools, it is Oak.
I had a quick look at the other two pieces yesterday and they both have the same staining. so it runs for about a yard vertically, at least.
'Is it an encased bit or is it just discoloured?' Just discoloured Dave with no sign (so far) of any metal.
The idea of staining from iron sounds good to me. Looks like it started when the tree was about twenty years old so it would have been big enough to support a bit of angle iron or similar for fencing. It could come from a supporting stake as Blister suggested. I wouldn't think anybody in forestry would use a metal stake, but it came off a housing estate, so anything could have happened.
'Now that's interesting. I've had exactly the same shape - in a variety of sizes - turn (ha ha) up in both hawthorn and apple....not just one but often several in one piece of wood.' Staples used to fix netting Greybeard?
I posted this just to close the thread. I finished turning the bowl and the inclusion is a separate bit of wood which has been surrounded by the main trunk.