Hi everybody.

I found this in a thin section of an oncolitic limestone that belong to late Jurassic - early Cretaceous period (Tithonian-Valanginian). im a begginer in this matters but my first impresion with help of some books en researchs was that this corresponds to an algae, added to the presence of the rounded structure that I think is a calcisphere or an algal cyst.

I am really looking for some comments or thoughts to help guide me to get a good description of the specimen and thus be able to say what kind of algae it is.

Any comment or thought will be well received, i appreciate your help and time, thanks!

(the pictures were taken with 10x objetives)