@Tamami If you're up to learn a bit of geology, you might grasp enough knowledge on how to do it on your own (with or without help of classifiers and other books).Some time ago I found a bunch of entry level lectures from a geology professor, made during the pandemic, that were interesting enough to follow, like that one https://youtube.com/playlist?list=PLOf4plee9UzCH2w8e2_xpvaq6w1gGCf5QAnd I bet there is an adjacent community here on fediverse, just one or two hashtags away.
