Ancient deltas reveal vast Martian ocean across northern hemisphere

Berlin, Germany (SPX) Jan 13, 2026
Using high resolution images from several Mars orbiters, an international team led by the University of Bern has identified a system of fan deltas in southeast Coprates Chasma that record the highest stand of an ancient ocean in Mars Valles Marineris. The geomorphologic structures, preserved today as scarp fronted deposits near the lower end of the canyon system, closely resemble classic river d