From MO301636, in Mare Acidalium, just outside Cydonia. Described as "knobs," these nearly perfectly round domes are almost identical in size (at least the portion that can be seen), proportion and make-up. Note that the craters in these objects do not display any evidence of ejecta. Their appearance is much more akin to a dented domical hubcap than a random, volcanic uplift. It should also be noted that the conventional "differential erosion" explanation for Cydonia's topography is completely inadequate to explain smooth, rounded features such as these.

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From M04-00576, also in Cydonia/Mare Acidalium. Very similar objects, with similar comments. Note possible buried circular structure tangent to lower left dented dome.

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