How could a man-made tool associated with modern times end up encased in rock dating from the Lower Cretaceous period? That's the question that's baffled scientists since the so-called ‘London Hammer’ was unearthed in London, Texas in 1936. It was discovered by local man Max Hahn, who noticed wood protruding from the rock and cracked it open to expose the hammerhead and ignite a furious debate.

If it was truly from the Cretaceous period then man was still another 100 million years of evolution away from creating such a tool. The hammer is currently displayed in the Creation Evidence Museum of Texas.

Read on for more ancient mysteries we still don’t know the answer to...

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17 mysterious ancient artifacts that experts still can't explain