In June 1936 Max Hahn and his wife discovered a strange rock with a wooden handle protruding from its core, in London Texas. When the rock was cracked open, they found an iron hammer within it. This became known as the London Hammer, a hammer that because of the rock encasing it was dated to the Ordovician period, more than 400 million years ago.
Modern humans have only been around for about 200,000 years. So how has a man made tool become encased in a 400 million year old rock?