What does the dome fossil become?

It seems you're asking about a specific fossil called the "dome fossil." However, there is no known fossil called that. To help me understand, could you please provide more information?

* What kind of fossil are you thinking of? Is it a specific type of organism, like a dinosaur or a trilobite?

* Where did you hear about this fossil?

* Do you have a picture or description of the fossil?

With more information, I can help you figure out what the fossil might become or what it might represent.