Can anyone identify this bracket please?

Can anyone identify this bracket please?

Observation - Can anyone identify this bracket please?. Description: I'm reasonably sure that the stump this bracket was found on is an oak, though I could be wrong as it has been dead a long time. The bracket has concentric, different coloured patterning on top, is quite thin and neither hard nor soft to touch. The brac

I'm reasonably sure that the stump this bracket was found on is an oak, though I could be wrong as it has been dead a long time.
The bracket has concentric, different coloured patterning on top, is quite thin and neither hard nor soft to touch.
The brackets were around 8 inches across.
In the second picture, showing the underside, you can see that the pores are elongated, rather than maze-like, so I thought might rule out oak mazegill??