Hi, jms.
"On the image I posted above, there is a hook shaped area of slightly darker material just above Vostok, oriented from lower left to upper right. The rectangle is at the short end of the "hook". That may represent slopes of a small rise, or an area of different surface material."
Yes and my point also. :) It does look like a small rise that gives way to a depression where Vostok is. That rectangle seems to have very sharp edges is obviously VERY dark and uniformly opaque... yah, what is it?
No, I've not seen stereo images of this area.
There ARE some very interesting MOLA images of Meridiani in this paper that Alex Blackwell shared with us before the rovers landed. Enjoy, a good read as well. For reference, Oppy landed at 1.95 degrees south latitude and 354.47 degrees east longitude.
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