[NormsRevenge]

These shots are from the Mars Rover site,images section,,

Opportunity :: Panoramic Camera :: Sol 036

Right Panoramic Camera Non-linearized Full frame EDR acquired on Sol 36 of Opportunity's mission to Meridiani Planum at approximately 13:06:41 Mars local solar time, camera commanded to use Filter 1 (719 nm). NASA/JPL/Cornell

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[NormsRevenge]

Opportunity :: Panoramic Camera :: Sol 036

Left Panoramic Camera Non-linearized Full frame EDR acquired on Sol 36 of Opportunity's mission to Meridiani Planum at approximately 09:16:13 Mars local solar time, camera commanded to use Filter 2 (754 nm). NASA/JPL/Cornell

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[unspun]

Ancient crop circle, eh?

[capitan_refugio]

I spent a fair amount of time early in my career looking at and describing cores taken from oil wells. I also was a fairly accomplished field mapper.

I know sedimentary structures when I am looking at them. Although I don't know the exact scale, that close-up is showing bedding. Since I can only assume that the top of the picture is "up" (you geologists will know what I mean), I sense a fining-upward sequence with occasional coarse interbeds. I am less certain about the smooth, dark gray features cutting across bedding, but I would hazard a guess that they may be the result of impact shock. They don't look like dessication cracks or dikes. However, they could represent some other sort of material injected under pressure.

Damn! What I would give to be standing there with my Brunton and Estwing soft rock pick.