From arstechnica.com

Edge of Mars’ great dichotomy eroded back by hundreds of kilometers

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What may have been an ancient shoreline has signs of a water-driven transformation.

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on Mon, 11PM

From nature.com

Dichotomy retreat and aqueous alteration on Noachian Mars recorded in highland remnants - Nature Geoscience

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The Martian dichotomy boundary receded hundreds of kilometres in the Mawrth Vallis region and left behind mounds that record changing aqueous conditions during the Noachian (4.1–3.7 Ga), according to a geomorphological and spectroscopic study.

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8h ago