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Knickpoints in Martian channels indicate past ocean levels

Duran, Sergio; Coulthard, Tom J.; Baynes, Edwin R. C.

On Mars, the presence of extensive networks of sinuous valleys and large channels provides evidence for a wetter and warmer environment where liquid water was more abundant than it is at present. We undertook an analysis of all major channel systems on Mars and detected sharp changes in elevation along the river long profiles associated with steep…