Miocene find; tube worm or fish poo...

[trempie4]

Found this over the holidays at a fossil site in Coastal VA that for me at least has never before this same trip coughed up any vertebrae material, that being a fish vert.  The primary finds at this site are scallops, barnacles and some of the more common smaller mollusks common within the Miocene coastal / tidal finds....  this is a Yorktown formation locality...

 

so, the question is, is the coiled material a fish coprolite or a tube worm? I’ve certainly never found any similar tube worms in my life so I’m hopeful it’s a coprolite but looking for some input from anyone w more definitive thoughts...

 

happy New Years and thanks In Advance. 

 

[MeargleSchmeargl]

Looks Tubewormy to me. Not entirely sure, though.

[Miocene_Mason]

Could it be the internal mold (steinkern) of a Gastropod?

to make sure it isn’t poo, I’ll call @GeschWhat and @Carl over here.

[izak_]

I agree with tubeworm.

[GeschWhat]

It appears to be the same color/consistency as the matrix, so my guess is a steinkern of some sort.

[abyssunder]

I would like to compare with a possible internal mold of this:

 

picture from here

 

 

[Carl]

I'm with the worm tube folks.

[Rockwood]

Serpulorbis 

Anyone care to take a swing at that curve ball ? 

 Edit: Oops! already been done.

[Rockwood]

How would one know the difference was the point.