An article published in the journal “Nature” reports a study on microfossils with structures similar to those of modern sponges that have an estimated age of about 890 million years, much older than any fossil attributed with certainty to animals. Geologist Elizabeth Turner of Laurentian University, Canada, studied microfossils from an area of ​​northwestern Canada known for Precambrian fossils, part of the Stone Knife Formation. This study has already divided paleontologists due to the difficulty of ruling out that these are fossils of different origin or even false fossils generated by some type of crystallization.