Relative dating unconformities
This is referred to as dating by association with they underwent relatively rapid evolutionary changes that are identifiable in their teeth and other skeletal parts.
Their bones also were frequently found in association with our human and primate ancestors.
In the past, relative dating methods often were the only ones available to paleoanthropologists.
As a result, it was difficult to chronologically compare fossils from different parts of the world.
In other words, they may no longer be in their primary context.
When the bones of our early ancestors are found in the same geological strata as those of other animals that are known to have lived only during a specific time period in the past, we assume that these ancestors must also have come from that time.
Another candidate was a famous practical joker who lived near the Piltdown gravel deposit during the early 20th century.
If not, then at least one of them must be physically out of context.
it had an ape-like jaw and was found in association with the bones of extinct animals, this "Piltdown Man" was also believed to be a very ancient human.
It contained tools and chemicals that could have been used to modify the ape jaw and human skull to give them the appearance of great antiquity.
The owner of this kit was Martin Hinton, curator of zoology at the time of the hoax.