shark coprolite?

[hndmarshall]

possible shark poo? 

the one on the right the larger of the two is worn and weathered have doubts on that one

but the one on the left with the broken ends found some interesting things embedded in it will post then in next post.

both appear to look wrapped or spiral

bith from gravel load from Brazos River west of Houston Texas.

[hndmarshall]

close ups of embedded objects in object on left.....

[Rockwood]

Sorry but I'm fairly sure it's no.

[Fossildude19]

I don't think coprolite on these.   

Maybe something fossiliferous, but the only thing I see that may be recognizable looks like bryozoan. 

@GeschWhat  @Carl

 

[Carl]

The one on the left has the higher chance of being a coprolite, but I'm with the others: probably not.

[abyssunder]

The one from the left side of the images makes me think of the possibility of silex, not ruling out coprolite, but considering its possible high content of silica.

 

comparative picture from here

 

 

[GeschWhat]

I'm on the fence with these. Best I can do is maybe.