Since the 1940's, the site has also produced animal fossils, stone tools and evidence that fire was used in the Middle Pleistocene.
Bitumens can provide good preservation of plants and animal fossils.
Few animal fossils are known from this formation, including:
Similar plant and animal fossils are found around different continent shores, suggesting that they were once joined.
No other plant or animal fossils were found in the surrounding area.
Some of the first animal fossils appear to be those of invertebrates.
It is claimed to be the oldest animal fossil, being found in rock aged between 760 and 550 million years ago.
The animal fossils are thoroughly studied and the process of evolution of animals is found out.
In 2010, a construction crew found a deposit of animal fossils dating back 1.4 million years.
Various plant and animal fossils have been found in the Chuckanut Formation.