Are there any future plans to have a robot to look at sedimentry beds on Mars for fossils?

It seems all the probes are designed to look for life today; and as i see it nobody's expecting to find somthing crawling around up there, but i dont see that that means there never were (which would be far more interesting than finding some bacteria that may or may not have hitched a lift on the probe.)

Does anyone know much about the sedimentry richeness of Mars; Theres not much on wikipedia, but it seemed to suggest that the best places to look would be layers older than 4Ga; would fossils survive this long? i know the conitions are different on Mars (no current plate tectonics etc.) but the earliest unanimously accepted evidence of life on earth is just over 2Ga. Is there any chance of finding intact remains? how late on could life have survived on mars?



If we'd looked up at the sky back in the archean, would there have been a blue green marble?

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I'm glad I was born in '86, I've seen a film about 1984 and it seems like it was a tough year to be alive.

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