Upper Cretaceous fossil from central Spain with surface pores

[DrDu]

Today, I found the following fossil in calcareous deposits from cental spain which are probably from the upper cretaceous. The little pores visible on the outside, make me think off a coral. What do you think?

 

[davenn]

Today, I found the following fossil in calcareous deposits from cental spain which are probably from the upper cretaceous. The little pores visible on the outside, make me think off a coral. What do you think?View attachment 209879

that first image gave me a hint of an ammonite/nautiloid series fossil with the curved ridged structure ... very hard to tell
the second image with the porous structure ... just not enough detail/remains of the original animal

something along the lines of these fragments specially when looking at the top left sample

cheers
Dave

 

[DrDu]

Dear Dave,

just came back from vacations. The fossil is somewhat porringer shaped, which I do not expect from an ammonite. Also there is no helical structure.

Cheers

 

[Bystander]

porringer shaped, which I do not expect from an ammonite. Also there is no helical structure.

Bacculite?

 

[Baluncore]

The bowl shaped depression looks like one side of a bivalve shell.

 

[DrDu]

Finally, I had the opportunity to show the pictures to a professional palaeontologist in a museum. He identified the fossil as a sponge, most probably from the group of hexactinellids.

 

[jim mcnamara]

Glad you got back to us with the answer.

 

[davenn]

Finally, I had the opportunity to show the pictures to a professional palaeontologist in a museum. He identified the fossil as a sponge, most probably from the group of hexactinellids.

Thanks for the update

Dave