Sedimentary structures have been found on Mars that mimic those formed by microbes on Earth.
It is the latest piece of evidence that suggests life was once on Mars, although it is not direct proof of its existence.
The structures were revealed in images of a lakebed that is thought to have undergone seasonal flooding billions of years ago.
On Earth, carpet-like colonies of microbes trap and rearrange sediments in shallow bodies of water such as lakes and coastal areas, forming distinctive features that fossilised over time.
These structures, known as microbially-induced sedimentary structures, are found in shallow water settings all over the world and in ancient rocks spanning Earth's history.
In a paper published in the journal Astrobiology, she detailed the striking similarities between Martian sedimentary structures in the 3.7 billion-year-old Gillespie Lake outcrop and microbial structures on Earth.
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