Cretaceous wood or perhaps bone

When I first found this fossil inside a very, very hard concretion, I thought it was a piece of marine reptile bone. Looking at it closer now, I think it could perhaps be a piece of petrified wood. I can't see anything that appears to be bone material, no cancellous material (honeycombing).

I think I spotted it first in this video: https://youtu.be/TYaGJv-Jp8A?t=295 and then the concretion had broken apart and I retrieved it in this part of a subsequent video: https://youtu.be/Cj9OYhV4Qv4?t=53

 

 

Watch the video of it being found

Age: Cretaceous