Mobin:

The documented form gives impression of being a Crinoid. You may like to see this link for insights:

http://www.scielo.org.mx/pdf/rmcg/v24n3/v24n3a5.pdf

Best

Syed

This is undoubtadly a crinoid or echinoid plate/spine cross and oblique section. There are many diagnostic features of echnioid/crinoid 

Many tanks for your comments

Can you tell me your idea about this microfossil? Are these algae or bryozoa?

Dear Andre

This phto take with lens x4. another photos from this thin section are in attached file.

This is a section of a echinoid spine..

It looks like a cross-section od an echinoid spine. What is the magnification?

Simply, if it exists as a separate unit, it will be Crinoid, but if it exists with colonies, it can be a coral.

It is almost a Crinoid.

Looks like a Crinoid

Mobin:

If you upload more than one set of pictures, do so with a separate question so that we know that the answers refer to which picture/s.

Thanks

Best

Syed

These two sections are indeed transverse sections of echinoderm origin (High-Magnesium Caclcite), most likely of crinoidal columnal plates (it also could be confused with transverse section of echinoid spines).

Regards

Bruno

Sir, as i know there is adequate presence of septa, poly, desipiment and sinuptculie in  calyx indicate coral but in this figure the showing features are not looking like this.

I have no doubt that it is a section of a echinoid spine. It does not show septa, tabulae or dissepiments. (I am specialist on corals, worked many years on carbonate microfacies and saw lots of thes echinoids spines.

it depends if its in colony form then its coral otherwise looks like crinoid 

This is an echinoderm plate, possibly an ecinoid spine.  What is being shown is the complex internal ar hitecture -the stereome.  The whole structure should go into extiction when viewed under crossed polarizers because each echinoderm plate is a single calcite crystal.

Dears,

I've seen a lot of these forms in Cretaceous (Albian) carbonates from the Iberian peninsula, usually they are characterized by syntaxial calcite cement, suggesting the idea of an echinoid spine.

Regards,

Lorenzo

 Hi, it is an echinoderm spine. Seemingly the magnification of your microscope is X100 is not it?, 

It is a cross section of an echinoid spine.

Definitively a transverse/cross section of an echinoid spine.

You ought to check and compare with Otto Majewske's seminal book or last edition of late Erik Flügel's carbonate microfacies.

Best

Hi, transverse section of echinoids spine.

Surely, it's not a coral because there are no differentiated septa (with various grades) in it. From what I can tell, it's actually a transverse section of an echinoid spine. Reza Sadeghi Muhammad Rizwan

I agree, it is a transverse section of an echinoid spine.