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Again I think it might be phosphate. The good news is that where there is phosphate nodules or blocks, it is a good locale to look for fossils.

Thanks @bill-heim i could find some nautiloids , brachiopods, gastropods

By the Miocene which so you seem to be mostly posting from, brachiopods were probably about as rare as they are today. They are found but much more likely would be mollusks with some gastropods thrown in. Nautiloids usually reside in deep water. I have seen them found in an Eocene deposit but they certainly weren’t common, I saw maybe 2 or 3 collected in a limestone quarry. The chambers were all separated so you had to know what you were looking at.

thanks @bill-heim for the info. i will take pics tomorrow of the fossils i found

found a few POLIDEVCIA, symmetrical gastropods; EUPHEMITES, and straight nautiloids; ORTHOCERAS