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The New Indication That A 9-By-12 Mile Meteor Impacted Mars, ~3 Bya, Giving Rise To A Thousand-Foot Tsunami, Which Created The Strange Landforms On Mars, Supports The Theory That Mars Did Have Surface Ocean. The Meteor Is Said To Have Formed The 75-Mile-Wide Lomonosov Crater In The Martian Northern Lowlands.

Scientists may have found ground zero of an ancient tsunami on Mars | Salon.com

https://www.salon.com/2019/08/01/scientists-may-have-found-ground-zero-of-an-ancient-tsunami-on-mars/

A 1,000-foot-high tsunami may have caused the strange landforms on Mars, study suggests