While reading a building magazine I came accross an article on a company that salvages 50,000 year old logs from the ground. These logs are absolutely huge! Which incidentally goes to show the effect humanity has had on forests, since we have precious few living trees of that size left. The wood is available for woodworking, turning etc.
http://www.ancientwood.com/
Disclaimer: I have not bought anything from them, just thought it was an interesting story. Consequently I can't tell if their service is any good or not. I'm not affiliated with this company either.
-Rob-