I am writing a sci-fi novel in which humanity has struggled to survive in colonies throughout the solar system after the Earth becomes uninhabitable. I am writing a passage about a main character's back story and want to make their parent a geologist. The issue is that I feel like there would be a difference to distinguish geologists who study the Earth and those that study the other planets. It seems pretty normal now that adding 'xeno' to anything in space makes it about space (i.e. xenobiologists study the biology of alien life, and xenogeologists would study the geology of other planets). Similarly, I have seen the usage of 'neo' for anything new.
I am wanting to use a prefix to distinguish Earth based geology from geology work done on other planets and am wondering if there is a prefix used that indicates something is old.
Clarification: My purpose is to distinguish geology of earth from geology of other planets. My thought was that using a prefix for 'old' might make sense, essentially meaning 'old earth study'. If there might be better alternative, I am open to suggestions.