A couple of tubular things

[Lone Hunter]

Both of these were collected in Grayson marl, is the small one a calamite? Hadn't occurred to me they could be found there.  The larger one was 2 straight pieces side by side but the host rock is so fragile and part of top layer crumbled and broke them.  Have not seen any burrows in Grayson so not sure if that's what they are.  

[Rockwood]

3 hours ago, Lone Hunter said:

, is the small one a calamite?

No. I don't believe so.

The top photo doesn't look strictly tubular. The edges are curled as it had a foil like texture originally. Perhaps a worm tube ?

[caterpillar]

Burrows

[Tidgy's Dad]

Yes, there doesn't appear to any any internal structure so I think burrow infillings are likely 

[erose]

I agree that there are some burrows here. But the first photo does show a little structure. It may possibly be something and at first guess I would suggest an Inoceramus shell hinge section. But just barely a SWAG IMHO.

[M Harvey]

7 hours ago, erose said:

I agree that there are some burrows here. But the first photo does show a little structure. It may possibly be something and at first guess I would suggest an Inoceramus shell hinge section. But just barely a SWAG IMHO.

I agree with erose.  Top photo is a inoceramus hinge.  The rest are filled burrows.