It was VERY warm for February in Pennsylvania - So, a few minutes walk from my home, I went for some fossils. It rained once I got there, so I did NOT get to the "best" sport, but I did manage to get these and a few more! I am wondering... What is the best way to clean them? And any recommendations to "stabilize" them? The slate can be a bit brittle. Clear spray shellac-type material? Thanks for looking! This area has neuropteris, pecopteriss, calamites, sigillaria, lepidodendron, ginko leaves and all the other usual suspects! Hoping for more warm days... And I think we will have them!