"It reminds me a little of Apollo 16: they went to Descartes because they thought they'd find volcanism and instead it was all impact.
Gusev is thought to be a dry lakebed, but so far it's more like lava"
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Great observation Raoul. That is what I like best about science and exploration. Paradigms and world views put to the test that come crashing down.

Volcanic moon paradigm killed by Apollo
Mars color vegetation died with Mariner 4
Hot Jupiters - a total surprise invalidating bogus computer "models" of planetary formation
Surprising revaltions that the rate of universal expansion is INCREASING
Io's volcanism (predicted just before Pioneer arrived)
Dark "matter" & dark energy comprises most of the observable universe

My 1st thoughts after looking at the surface of the Gusev 'lakebed' was that the old warm, wet Mars paradigm was about to die