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A visit to Cydonia on Mars

Strange geology in Cydonia on Mars
Click for full image.

Cool image time! The Cydonia region on Mars, located at around 30-40 degrees north latitude in the northern lowland plains just beyond the transition zone up to the southern cratered highlands, is well known to many on Earth because it was here that the Viking-1 orbiter took a picture of a mesa that, because of the sun angle, made its shadows resemble a face. Thus was born the “Face on Mars” that consumed the shallow-minded among us — and thus the culture, media, and Hollywood — absurdly for decades, until Mars Global Surveyor took the first high resolution image and proved without doubt what was really obvious from the beginning, that it was nothing more than a mesa.

Cydonia however remains a very intriguing region of Mars, mostly because it is home to a lot of strange geology, as shown by the photo to the right, rotated, cropped, and reduced to post here. Taken on January 16, 2021 by the high resolution camera on Mars Reconnaissance Orbiter (MRO), it shows some of that strange and inexplicable geology.

While Cydonia is inside that 30-60 degree latitude band where MRO has imaged numerous glacial-type features, I do not know if many such features have been found there. Except for the pits and depressions in the photo’s lower right — which suggest decay in an ice sheet — little else at first glance in the picture clearly invokes any of the obvious glacial features one comes to expect. There appear to be what might be lobate flows in the image’s center going from the west to the east, but if they are glacial, they are so decayed to as leave much doubt.

The overview image below shows where Cydonia is on Mars, and helps explain partly what is found here.


The white cross marks the location of today’s photo. The black dot indicates the location of the “face” mesa.

Cydonia sits mostly in the northern lowlands. Though the region has many knobs and mesas that resemble the chaos terrain like the glacier country in Deuteronilus Mensae to the east, much of its chaos appears to be in its final stages of erosion, so that it is more a plain of small knobs and mesas than a region of cross-cutting canyons with large mesas in-between. Thus if there is buried ice here, rather than finding it in glaciers flowing off mesas it is more probably locked in underground ice sheets, as suggested in the lower right of today’s cool image.

In fact, the wider view provided by MRO’s context camera of this same place, rotated, cropped and reduced and posted below, makes its ice-filled geology more evident, though still far from certain. The craters in the wide view seem filled with some debris, and in numerous spots across the entire terrain there appear what to my eye look like corroding glaciers.

This is all a guess on my part, based on what I now know of Mars’ geology and how driven it appears to be by latitude. The white box below marks the location of the close-up image above.
Context image from MRO

Conscious Choice cover

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  • Jeff Wright

    Perhaps lower gravity shapes erosion differently. The “face” wasn’t as interesting to me as a nearby feature that resembled the state of Alabama-minus Mobile.

  • Gary

    Thanks for the heads up. I’ve never listened to the Space Show live, always via Podcast. But I may try to stay up for this one!

  • humphreyrobot

    No telling what atmosphere Mars once had too. Any guesses on atmosphere compositions and effects?

  • Ed

    Hi, I can’t find the face or any of the often mentioned features.
    Could you circle the face area so I can find it?

  • Ed: It is your kind of comment that makes me grumpy. If you would read my article, you would see that I provided links to articles with images of the “face” mesa. You would also discover that the map I provided provides the location, well to the west of the subject image.

    As I say, you need to read things to get your questions answered. I am continually surprised how many people no longer know how to do this.

  • Jeff Wright

    The “Face” never spooked me like Miranda-which all but looked strip-mined

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