i dont think its calpionellids, generaly the calpionellids take a morphology like U and occur in pelagic limestones of Late Jurassic and Early Cretaceous Tethyan oceans.

First of all check whether these could be echinodermal pieces! Each echinodermal piece behaves like a single crystal and turns out black in one goal with cross-polars on when rotating the microscope stage. Because a single Saccocomid animal is made of numerous pieces you should have a lot of them in a single thin section, not few of them.

Obviously your material does not comprise any calpionellid!

In this bioclastic debris it is very difficult to recognize Saccocomids; however, their presence cannot be excluded. By contrast, calpionellids are missing in the microphotographs.

Dear Dr. Simmons, Dr Granier and Dr Cipriany and Mr. Mahboubi

Thanks all for answering. The Calpionellids I mentioned are not in the provided images, I have sent them to Calpionellid experts and though there are resemblances they all doubt their being Calpionellids.

The fragments in the images above are everywhere in this thin section I just picked those closest in resemblance to broken saccocomids and as you all suggested it is hard to say.

I just hope somebody with experties in this specie could recognize them.

With many thanks

Dear Dr Simmons

Your knowledge of Formations in Zagros is great. This belongs to Central Iran basin and the formation is local.

Thanks for your intrest.

Hello Hesam,

These three pictures illustrate transverse sections of brachial plates and oblique-tangential sections of a partial? theca from roveacrinoids.

These are not genuine Saccocoma 'specimens' but are usually referenced as Saccocoma microfacies.

If you have some other sections available, this may be worked out.

Feel free to contact me.

Best

Dear Dr Bruno Ferre

Thanks alot for answering the question I will certainly contact you.

With best regards

Hesam

The new challenge is these debries do not show extinction under XPL do they still belong to roveacrinoids.

The upper picture shows a rather fuzzy calcitic bioclast; please be more careful: you should notice some light change in exticntion pattern.

As for lower pictures, the right one shouldshow some "undulating" extinction while the left one should show some delayed pattern.