They discovered a four square mile ancient forest in Illinois while coal mining. I believe the fossil site in Illinois was dated to the Upper Carboniferous. You never know what awaits down in a mine, in horror films there are monsters but for science geeks what they actually find is even more interesting.
“in horror films there are monsters but for science geeks what they actually find is even more interesting.”
Oh, I don’t know about that. Some poor geek in a coal mine would find an other-worldly monster mighty interesting indeed. ;-)