Small burrow from Pyrenees (Spain)

[Seracc]

I found it in an area where traces of worms and crustaceans abound, but there are no other remains (shells or corals).

 

I asked on national forum (Spain) and they tell me that it is too big to be a polychaete. They suggested a burrow. 

 

Any other ideas or votes for burrow? 

 

Thanks, 

 

The coin has a diameter of 1.62cm

 

[Seracc]

[Seracc]

Ouch,

 

Sorry, delete it. 

 

I thought first time the post doesn't work. 

 

Thanks 

[Paleorunner]

29 minutes ago, Seracc said:

I don't know what it could be, but it would be nice to include some more photos, seeing the whole piece, front and back, a shot as close as possible, knowing its geological age, the more information you give us, the better we can help.

Saying the size it has, it is enough, it is not necessary to put coins.

[fifbrindacier]

Hi from the other side of the Pyrenees.

I also think this is a burrow, with mineral stains around it.