2 ms·When was anything there last active?by fhood 9y agoWhen was anything there last active?quotemstr 9y agoDoes it matter? It's not as if the deposits migrate.jhayward 9y agoOn Earth they certainly do, if you choose the right time scale.quotemstr 9y agoRight, because the Earth has tectonic activity. Mars? Not so much. Geology should have been stable over the 500 million years since Mars last had significant geological activity.