Piltdown Man

The "Piltdown Man" is a famous hoax consisting of fragments of a skull and jawbone collected in 1912 from a gravel pit at Piltdown, a village near Uckfield, East Sussex. The fragments were thought by many experts of the day to be the fossilised remains of a hitherto unknown form of early human. The Latin name Eoanthropus dawsoni ("Dawson's dawn-man", after the collector Charles Dawson) was given to the specimen.

The significance of the specimen remained the subject of controversy until it was exposed in 1953 as a forgery, consisting of the lower jawbone of an orangutan combined with the skull of a fully developed, modern man.

The Piltdown hoax is perhaps the most famous archaeological hoax in history. It has been prominent for two reasons: the attention paid to the issue of human evolution, and the length of time (more than 40 years) that elapsed from its discovery to its exposure as a forgery.

From Wikipedia