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The imprint of a leaf was also discovered within the basalt, which was also regarded as remarkable, remembering that the enclosing rock was once molten lava erupted at 1000–1200°C (about 1800–2200°F).

So how could these tree trunks have survived being engulfed by molten lava?

In a newly melted part of Greenland, scientists have found what they think is the oldest fossil on Earth, a remnant of life from 3.7 billion years ago.

(Laure Gauthiez/The Australian National University/Associated Press) Nutman said the main controversy was likely to be that the fossils were in metamorphic rocks, reckoned to have formed under huge stress with temperatures up to 550 C (1,022 F) — usually too high to preserve any trace of life.

The matter remains significantly unresolved because of the severely fragmented nature of the fossil record.Greenland's government hopes that a thaw linked to global warming will have positive spin-offs, such as exposing more minerals.In this photo provided by Laure Gauthiez, taken in July 2012, a field team examine rocks in Greenland.This is a rock with the stromatolites, tiny layered structures from 3.7 billion years ago that are remnants from a community of microbes that used to live there.(Allen Nutman/University of Wollongong via AP) The earliest fossil evidence of life on Earth has been found in rocks 3.7 billion years old in Greenland, raising chances of life on Mars aeons ago when both planets were similarly desolate, scientists said on Wednesday.The site was already known as the source of some of the earliest modern human remains ever uncovered, but the latest discovery pushes back the emergence of Homo sapiens by a full 100,000 years.