Marine Jurrasic fossil

[mr fossil]

Hello 

i found this fossil near Riyadh 

it is from the Hanifa formation(156million years old)jurrasic.

I was in the transition zone between coral limestone and sandy limestone.

I think the area I was in was a shallow  sandy sea floor.

Does anyone know what this may be.

thank you so much for your time

i appreciate it.

 

Edited January 13, 2022 by mr fossil

[FranzBernhard]

Would you like to give more views of the object?

Whats the fine structure of the object?
Thank you!

Franz Bernhard

[mr fossil]

42 minutes ago, FranzBernhard said:

Would you like to give more views of the object?

Whats the fine structure of the object?
Thank you!

Franz Bernhard

Yes of course.

Il do that now

[Ludwigia]

Looks sort of oysterish in its form to me, although in its structure it appears to be pure stone.

[mr fossil]

8 minutes ago, Ludwigia said:

Looks sort of oysterish in its form to me, although in its structure it appears to be pure stone.

Could it be a sponge?

[FranzBernhard]

1 hour ago, mr fossil said:

Could it be a sponge?

Hard to tell! In the last pic, I can see some sort of microstructure, but can not really make sense of it. Maybe its something like a sponge in the widest sense.

Very remotely something like this:

 

or that:

Franz Bernhard

[oyo]

I do not rule out that it was a coral. Details would have to be seen. Macro shots of the presumed calicinal surface are necessary.
Nor would rule out coral in some of Franz's specimens. In this case I think again of Ahrdorffia without ruling out chaetetid sponges of the Diplochaetetes type or similar.

Edited January 13, 2022 by oyo

[mr fossil]

1 hour ago, FranzBernhard said:

Hard to tell! In the last pic, I can see some sort of microstructure, but can not really make sense of it. Maybe its something like a sponge in the widest sense.

Very remotely something like this:

 

or that:

Franz Bernhard

Could it be this 

[FranzBernhard]

Could be, could not be...

Sorry, no more definitive answer handy.

But first, we need more microstructural details. Its even not completely sure your specimen is a fossil...

Franz Bernhard

[mr fossil]

6 minutes ago, FranzBernhard said:

Could be, could not be...

Sorry, no more definitive answer handy.

But first, we need more microstructural details. Its even not completely sure your specimen is a fossil...

Franz Bernhard

Thank you so much for your time

i appreciate it.

thank you!

[abyssunder]

Stromatoporoid?

[kgbudge]

I'm thinking trace fossil -- a bit of a fossilized burrow. But, yeah, more pictures would help.

 

(And don't mistake me for an expert. The experts certainly won't.)

[fifbrindacier]

Although i'm inclined to think it's a sponge, i won't rule out a coral. Hard to decide.