London Hammer

The London Hammer (also known as the "London Artifact") is a hammer made of iron and wood that was found in London, Texas in 1936. Part of the hammer is embedded in a limey rock concretion, leading some to regard it as an anomalous artifact. The tool is identical to late 19th-century mining hammers; one theory for its encasement in rock is that a deposit of highly soluble travertine may have formed and hardened around it within a relatively short time.