NE Texas fossil help please

[John G. Scoggins]

One of my coworkers found this at a lake in NE Texas last Saturday.I'm pretty sure its some type of fossil but don't know what of.Anybody know what it is?

[Scotto]

Pretty cool John. Possibly a tail vertabrae?

[jbridered]

I was thinking vertebrae also.

[Steve Valentine]

The third picture down sure looks like a Pelvis Bone to me.

[Indianasmith]

I think it may be a very large baculite section, but I would have to handle it to be sure. Big one if it is.

[bar2kl]

Hi John... Looks like some of the process group from a Mosasaur or maybe a Plesiosaur vertebrae, But I don't think I've ever seen one broken quite that way... It looks like the main vert spool was broken off, leaving only the process group... a unique piece, for sure... IMO Thought about a Bacculite or Ammonite section, but doesn't quite fit (but doesn't quite fit the vert process either) We'll see

[John G. Scoggins]

Thanks for the replies.

[joshuaream]

I find pieces really similar to that in Venezuela, do you have ammonites where that was found?

I was told by a paleontologist that they are part of the internal structure of a large ammonite.

This is a picture I found of a big cut ammonite, the wavy barrier between the different chambers looks like that when the outer layers break away.