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Ancient Mars Ocean Found?
astroengine writes "With the help of rover Curiosity, we now know that ancient Mars had large quantities of liquid water flowing across its surface. However, evidence for large bodies of water — i.e. seas/oceans — has been hard to come by. But using high-resolution orbital data, Caltech scientists now think they've found a long-dry river delta that once flowed into a very large body of water. Welcome to the Aeolis Riviera — the strongest evidence yet for a Martian coastline. "This is probably one of the most convincing pieces of evidence of a delta in an unconfined region — and a delta points to the existence of a large body of water in the northern hemisphere of Mars," said Roman DiBiase, Caltech postdoctoral scholar and lead author of the paper that was published (abstract) in the Journal of Geophysical Research."
Actually Venus is a better picture of where we are headed.
Indeed. Just off the top of my head:
Gypsum sand and gypsum inclusions in rock strata.
Calcium and sodium perchlorate salts
Hydrated silica clay
All three of those require not just water, but often standing pools of water. The perchlorates especially, which at least on earth, form when salt water is slowly evaporated under exposure from strong UV radiation. Gypsum is a hydrated calcium sulphate salt, and requires liquid water to crystallize.
The hydrated silica clay can from just from ambient soil moisture working its magic on feldspar minerals, but usually requies active weathering. Like, rain.
As the parent said, there is ample evidence of water having been on mars. Lots of water.
NASA Phoenix Mars Lander Confirms Frozen Water
... whatever