I just realised that I have never seen or used it, neither crude oil of course, but there are more variants of it than this natural mineral that powers a lot of the world.
Sure! My stepfather was a coal miner and brought home several fossils in coal when I was a kid. Ferns, tree bark, etc. I’ve lost track of them over the years, unfortunately.
I’ve actually been in a coal mine too. In my hometown, they have a decommissioned mine where they give tours.