Unusually 'defined' blob
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This doesn't look like your average blotch of dustiness!
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I saw what looked like a lake bed in my first image. Not sure about this being similar since it doesn't seem to have much in the way of associated river stream patterns. Could be a rock outcrop or even a hole. Circular ones have been found on the flanks of the giant volcanoes that are thought to be openings into old lava tubes. Then again it does look vaguely like a cat;-)
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