[London, UK] Fossil river Thames?

[Omono]

Hi everyone,

 

I was walking by the riverbank of the Thames in London during a low tide and on the sand I found this tooth-shaped stone, to be honest it doesn't feel like a stone but more wood as it's very lightweight. It's about 7.5/8 cm long and the texture inside it on the top end makes me think about a bone.

 

I'll leave it to you thanks in advance.

 

 

[Rockwood]

It's most likely a fragment of a modern fish bone.

[Mark Kmiecik]

I too get a fish bone feel from the last photo.