Dear Jenan,
not sure, but these look a little like the inner structures of some Ammonoidea to me, although it is unusual to find them "lined-up" in such a straight row, as it were... Did you investigate the possibility of these cigar-/oval-shaped units potenially being single (separate) organisms each?
Best,
Julius
Could it be a series of individual bivalves encrusting a surface? This is known from the Cretaceous of Central Texas (Corbula bed of Glen Rose for example). Alternatively, could this be a slice through the edge of a gastropod? Thanks for sharing.
Dear Jenan,
Would you please take a look at a benthonic foraminifera from Upper Cretaceous under these genera names: Dentalina, and I am more into Laevidentalina!?
I support Abdulrahman Bamerni and suggest that this could be a uniserial foraminifer or a chain of single cell foraminifera
Thank you all for your answers and help. I have decided to go with Abdulrahman Bamerni 's answer.
Jenan Ahmad Attar Gareth Llwyd Jones Thanks, I can add: it will be more clear if we know the main lithology of the rock unit, for me I can't decide from the photomicrograph, but the dark brown color inside these chambers either due to hydrocarbon-rich rock interval, or pyratiziation which target the fossils skeletal especially I have the same situation from the Upper Cretaceous deposits in Kurdistan Region of Iraq.
The main lithology is marl. The dark color inside the chambers is iron oxides. These sediments were deposited in the Foreland Basin during Upper Cretaceous.
Abdulrahman Bamerni Gareth Llwyd Jones
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