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Nice but It’s impossible because the ammonites are 65 millions years old max then 18 millions years old is impossible

Thanks for your tips
The theory that ammonites died out with the dinosaurs in the Cretaceous extinction may be true, but specimens of ammonites have been found that probably date back 17 million years.
In the place where I live, there are many such fossils, but there are surprisingly intact ones

Then there are maybe nautilus because they survived After the extinction of Dinosaurs, ammonites,…

Since my fossil has a smoother surface and healthier keratin, you may be right