What is this?

[swains]

I found this embedded in some rock at the bottom of  a riverbed in Wimberly, Tx, a little north of San Antonio. Can you help me ID it? It looks like a claw of some sort. Is hard as a rock.

[izak_]

It could be a shell cast or something similar to that, but certainly not a claw. I'm not familiar with that area so it being a cast could be wrong.

[abyssunder]

Welcome to the Forum!

Can we have an end view of the wider end?

[swains]

Here you go! Spoon is for size comparison.

[Fossildude19]

I agree, it seems to be an internal cast.  
I'm thinking maybe gastropod or ammonite?  

Maybe some locals will chime in. 

Regards,

[Arizona Chris]

Reminds me of two things - besides what Tim says an worn internal cast of an ammonite and probably cretaceous in Texas, or a section of Thallassanoides burrows which also appears in the cretaceous.  

[swains]

Thanks so much! Looking at everything it does look to be an internal cast of something or other, maybe an ammonite. You guys were very helpful to someone who knows nothing of fossils!

 

Thanks!

-Scott

[caldigger]

Can I see some pictures of the spoon from different angles?

[abyssunder]

Thank you for the pictures.

I wouldn't exclude the possibility of a worn caprinid internal mold.

 

excerpt from R. W. Scott. 2002. Albian caprinid rudists from Texas re-evaluated. Journal of Paleontology 76(3):408-423