Oldest-ever Fossils Show Life on Earth Existed 4bln Years Ago

Local Editor

Ancient fossils discovered in Canada are "direct evidence" that life existed on Earth 4 billion years ago, scientists wrote in a newly-released study, believing the emergence of life could be simple enough to begin on other planets.

Researchers believe the microfossils - discovered in Canada's Nuvvuagittuq Supracrustal Belt, which hosts some of the oldest sedimentary rocks known on Earth - are between 3.77 billion and 4.29 billion years old.

The discovery led scientists to believe that life was present during the infancy of the planet, which is thought to be around 4.57 billion years old.

If the dating is accurate, it would represent an "almost instantaneous emergence of life" after ocean formation, lead author Matthew Dodd said, as quoted by Reuters.

The tiny microfossils were found to be half the width of a human hair and up to half-a-millimeter in length. Their appearance is of blood-red tubes and filaments, formed by ocean-dwelling bacteria that fed on iron.

The dating puts the fossils "within a few hundred million years of the acceleration of the solar system," University College London Professor Dominic Papineau, who made the discovery, said in a video statement cited by AFP.

Even at the lower end of the range, "the microfossils we discovered are about 300 million years older" than any runners-up, Papineau said.

Locked inside white quartz structures, the microfossils were found in what were once warm-water vents on the ocean floor, most often in deep waters.

The finding has prompted scientists to hypothesize that such vents may have been some of the earliest habitable environments on the planet.

However, one of the researchers acknowledged skepticism about whether such fossils are biological in nature, or merely natural mineral formations.

Source: News Agencies, Edited by website team