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François Costard, a geomorphologist at the University of Paris-Sud, is at the forefront of work investigating surface features on Mars for historic evidence of oceans.

In 2017, a team led by François Costard, a planetary geomorphologist at the French National Center for Scientific Research, used computer modeling to reproduce the mega-tsunamis most likely to have created those thumbprint terrains.

For the new paper, Dr. Costard and his colleagues examined these candidate craters and ultimately zeroed in on Lomonosov, which was likely forged by a 9-by-12 mile meteor in just the right place at just the right time.

Study author Francois Costard, a scientist at the French National Centre for Scientific Research, theorizes that an asteroid created an enormous crater, but it also sent a thousand-foot wall of water sweeping around the planet, creating strange landforms on Mars.

The theory derives from a visual inspection of Mars’ strange surface features conducted by Costard and his team.