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At 13:43:07 UTC the Mars Hand Lens Imager (MAHLI) imaged these very unique concatenated rock rings.
The photo was taken from a distance of 7.59 cm with a definition of 0.034 mm/pixel, thus covering an area of 5.45 cm X 4.05 cm.
The rock rings you are observing are roughly the diameter of the little finger of a woman’s hand!
Looking at the nearest ring you can see an eccentric cavity a little less than half the diameter of the ring itself.
Without the intervention of “something biological” I can’t imagine anything that would produce such a shape. From the way the three rings are arranged one after the other, they might suggest fossilized vertebrae complete with a medullary canal.
Having said that though, I would like to remind you that the similarity of shape is not considered scientific proof and that my observations are simply personal impressions.
So, if any geologists would kindly offer convincing alternative explanations, they will be welcome.
To show colors more similar to what the human eye would see, I subjected the image to white balance and a slight increase in microcontrast and color saturation.

Original image:

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