You Can Find Caveart In Desert Mountain Tropical Forest Mines But The Desert And The Mountain Mine Have a Better Chance To Find Caveart On It
In Desert Mine: You Can Find Caveart In Desert Mine ( I Think Better Chance To Find ) Under The Mesa Blocks Mesa Blocks Have Caveart Under It There Is A Lot Of Mesa Blocks on Desert Mine Thats Why You Need To Search Harder "-"
In Mountain Mines: You Can Find Caveart Inside The Big Mountains In Mountain Mines Just Make A Tunnel :)
( level 50 can follow you anywhere so I suggest you use maxed level pet )
FOSSIL: fossil worth more then cave art a little it worth 400c-600c but its a bit rarer then cave art too you can find fossils in tropical mines you have small chance to find fossil in mountain mine the more blocks were in the mine the more it will be harder
btw if this post was helpful for you let me know :)