Opportunity has crept down to some different looking layers in Endurance crater. Below, however, is a rear-view shot showing what happened when the rover wheeled past 'Tennessee', a rock previously Ratted by the rover. Oops!

http://marsrovers.jpl.nasa.gov/gallery/all...00P1312R0M1.JPG

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Burmese

Wow! the rock tilted up! Does that mean there was a hollow area under one side of it?

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What the heck formed the little tabs sticking up at the edges of these rocks?
Recent shot from Endurance

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Looks like a harder crust was laid down between two epochs. It outlasts the high-sulfate matrix by a bit.

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Burmese

Here's a graph showing the rising chlorine abundace as the Opportunity Rover looks at lower layers in the crater. Not that the other scale is Sulfur abundance, which doesn't change much. Note also that the abundances in the upper layer closely match those at the first [shallow] crater they saw. These values were all found at locations where the Rock Abrassion Tool [RAT] was used, so dust is not a big part of what's being measured.

Sadly, there is no scale numbers on this graph.

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Here's a link to a 3-megabyte false color image of the RAT-holes in Endurence crater.
Note the blue sky!

Endurance Crater color shot

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