The northern interior rim of the largest volcano in the solar system

Northern interior rim of Olympus Mons
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Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on July 8, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows the northernmost interior rim of the caldera of Olympus Mons, the largest volcano in the solar system.

This one picture provides another way to illustrate the monumental scale of much of Mars’ topography. From the top to the bottom this steep scarp descends about 5,900 feet, in a little more than two miles. Compare that to the trails that descend the Grand Canyon’s south rim, which drop about the same distance but do it in distances ranging from three to five times longer.

In other words, this cliff wall is steep. Finding a route for a trail either up or down would be difficult at best.
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A triangular Martian hill

A triangular Martian hill
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Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on May 29, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows what the science team labels an “unusual shaped hill” that is estimated to be about 20 to 40 feet high.

What makes it unusual? First, it sticks up out of the endless northern lowland plains for no obvious reason, though its shape suggests the existence of bedrock topography that is now buried by the dust and debris that coats the surface of those plains.

Second, the hill itself suggests that it formed after it was covered with debris. Note the crater near its northeast cliff. It appears that the cliff chopped off part of the crater, suggesting that the hill was once level with the surrounding terrain. Some later underground pressure pushed it upward, with its angled sides determined by existing faults.

Why those forces tilted the hill upward as it did, with only its eastern fringes raised, is a question a wide view might answer.
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Polygons and scallops in the high mid-latitudes of the Martian lowland plains

Polygons and scallops in the high mid-latitudes of Mars
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Cool image time! Only yesterday I posted an image of polygons in the dry equatorial regions of Mars, where little evidence of near-surface ice is found and are thought to be the remnants from a long-dried lakebed.

Today we take a look at some polygons in the mid-latitudes of the icy northern lowland plains, where near-surface ice appears ubiquitous and as it sublimates away with the changing seasons causes all kinds of strange formations, including polygons.

The picture to the right, cropped, reduced, and sharpened to post here, is a good example, centered on a 0.6-mile-wide bright crater that appears to be filled with glacial ice. The image was taken on June 22, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO), and is located at 44 degrees north latitude on the western edge of Utopia Basin. As noted by the MRO science team in 2006 for a different MRO picture with similar features:
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The drying out of Mars’ tropics

The drying out of Mars
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Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on June 26, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). The science team calls the features surrounding these small 20 to 60 foot high hills “polygon features,” an apt description and a geological feature that is seen in many places on Mars.

When these features are found in the icy higher latitudes, it is believed they are formed in connection to the freeze-thaw cycle that causes cracks in the near surface ice. When found in the dry equatorial regions, where these polygons are located, they are usually thought to be ancient evidence of past standing water that left behind these cracks, much like the cracks seen in mud after the water has evaporated away on Earth.

The formation of these tiny hills is a bit more complex.
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Layered glaciers in two small Martian craters

Layered glaciers in two small Martian craters
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Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on April 7, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows what planetary scientists label somewhat vaguely as “layered deposits,” because though the features inside both of these craters strongly resemble glacial ice features, until this is confirmed a good scientist remains skeptical.

I can be more bold, and call the layers glacial in both of these small and very shallow craters (less than a 100 feet deep). To explain this it is important to understand that the lighting and shadows make it hard to distinguish the high points of these layers. Based on the elevation data from MRO, the ground descends to the south, and the mesa in the southern half of each crater’s floor is actually far below the layers and material to the north.

This elevation data suggests that the layered material is surviving best against the crater’s northern interior wall, which at this latitude, about 36 degrees south, will be in shadow the most.
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Martian ice islands amidst a Martian ice ocean

Glacier country on Mars
Glacier country on Mars

Martian ice islands in a Martian sea of ice
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Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on June 19, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

The scientists simply labeled this “Deposit Layers,” but that description hardly covers the incredibly diverse and puzzling features within the picture. We see layers, swirls, and radiating groves, all suggesting glacial features. We see mesas apparently covered with ice, and a flat surrounding lower plain that appears to be also ice but acting more like an ocean or sea. If there is any visible bedrock at this location it is difficult to determine.

The dominance of ice features is not surprising however, considering the location. The red dot on the overview map above marks this location, in a large 80-by-56-mile-wide basin inside the 2,000-mile-long northern mid-latitude strip I dub glacier country, because almost every image from MRO shows distinct glacial features. This particular basin is considered part of the segmented and indistinct canyon dubbed Mamers Valles, that winds its way through this glacier country of chaos terrain to eventually drain into the northern lowland plains.

From a geologist’s perspective, however, the layers are the most significant feature in the picture, as those layers mark the innumerable climate cycles that have apparently shaped the Martian surface. Mapping those layers will likely involve decades of work, but when largely completed we shall have a very precise history of the red planet’s geological history, going back several billion years.

Martian mounds surrounded by moats

Martian mounds with moats
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Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on February 1, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows what the camera team labels “Circular Mounds Surrounded by Moats,” which when all the known data is considered are probably caused by a spray of small meteorites landing on a field of ice.

Why ice? The location is at 37 degrees south latitude, in the cratered southern highlands of Mars, where many images show glacial-type features inside many craters. In fact, all the nearby craters at this location appear to have such features, suggesting the presence of near-surface ice trapped in these craters.

The picture actually looks at the floor of another such crater, with the mounds in the image’s upper left the crater’s indistinct central peaks. Though only 8.5 miles wide, the crater is deep, with interior walls that quickly rise 2,800 feet to the rim. That depth further suggests ice, as any snow that fell here in the far past could easily become trapped, inside what could be thought of a cold trap.
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Bubbling but frozen terrain on Mars

Bubbling but frozen terrain on Mars
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Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on June 8, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows some of the more unusual terrain found at the higher latitudes in the Martian northern lowland plains.

How do we explain this strange landscape? Based on what little we presently know about Mars, at 40 degrees north latitude this bubbly-looking surface probably indicates the presence of a lot of near-surface ice that at some time in the past was heated for some reason and thus bubbled upward to form these mounds. Think of tomato soup simmering.

Unlike simmering tomato soup, this terrain is solid and no longer bubbling. We are looking at a soup that has frozen even as it bubbled. The process could have been like an ice volcano, the ice turning to thick slurry that froze quickly, like lava. Or it could have happened fast, and then froze to remain unchanging in the eons since.
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Petrified dunes on Mars?

Petrified dunes on Mars?
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Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on May 31, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

I think the many parallel ridges are likely hardened and petrified dunes of sand because of their craggy nature. Dunes of sand would have a smoother, softer look, and in fact, if you look at some of the dunes inside the depression at the bottom-right of the picture you will see ridges with exactly that look, smooth and curved.

Nor is it unreasonable to believe these ridges are petrified dunes, as orbital data over time has found that many of the dunes on Mars, even those that look active, are not and have likely been hardened for centuries.

As for the ridges running at right angles to each other in the picture’s middle left, I have no idea. Possible we are looking at ancient dykes of lava that pushed up through cracks and faults, but this is pure guess.
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The splatter surrounding a mid-latitude Martian crater

A channel in the splatter of a Martian crater
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Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on April 12, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows what the scientists simply label as “Northern Mid-latitude Terrain”.

I have focused in on that meandering channel and the landscape around it. On Earth we would assume that channel marks the drainage of a river or stream, possibly also shaped by a glacier at some point because of its U-shaped profile. This guess is strengthened by the elevation data from MRO, which shows the channel descending to the southwest about 440 feet along its 2.2 mile length.

The channel and the eroded look of the surrounding terrain suggests strongly the presence of near-surface ice at this location, which is not unreasonable based on its 32 degree north latitude. The wider look below only adds further strength to this hypothesis, but also adds a lot more details explaining the genesis of this strange landscape.
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Buried ridges at the bottom of a Martian abyss

Buried ridges in a Martian abyss
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Today’s cool image could be labeled a “What the heck?!” photo, as the origin of its most distinct feature is utterly baffling. The picture to the right, cropped, reduced, and sharpened to post here, was taken on June 18, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO), and shows what look like a collection of meandering ridges peeking out from a terrain covered by thick dust.

The scientists label this dust-covered ground, as well as the ripple dunes to the south in the full image, “sand sheets.” Without question, the ground here seems to resemble a Sahara-like terrain. It is utterly featureless, other than the few bedrock features that poke up out of that sand. In the full image some peaks stick out, but it the meandering ridges in this section that are most intriguing. They are reminiscent of rimstone dams in caves, but what formed them remains baffling, since cave rimstone dams are formed by the interaction of limestone and water, and there is absolutely no evidence of any near surface ice at this location in the dry equatorial regions of Mars.

All the ridges signify is a buried terrain formed in some inexplicable way.
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The prevailing winds in Mars’ volcano country

The prevailing winds in Mars' volcano country
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Today’s cool image is actual one new picture and four past images, which taken together reveal something about the larger wind patterns on Mars. The picture to the right, cropped, reduced, and sharpened to post here, was taken on June 27, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO) and shows a tiny wind-swept section of the giant volcanic ash field dubbed the Medusae Fossae Formation, about the size of the subcontinent of India and thought to be source of most of the dust on Mars.

The innumerable parallel thin ridges here all suggest that the prevailing winds blow from the southeast to the northwest. As they blow, the scour the surface ash out, and sometimes reveal the underlying bedrock, which here shows up as those small peaks and a handful of northeast-to-southwest trending larger ridges. Note too that the picture shown is only a small section of the full image, which shows that this landscape continues for a considerable distance in all directions.
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Residue ice in southern mid-latitude Martian crater?

Residue ice in the southern mid-latitudes of Mars?
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Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on April 10, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows an unnamed 1.2-mile-wide crater at about 35 degrees south latitude with what appears to be residual glacial ice hugging its north interior wall.

As this is in the southern hemisphere, the ground immediately below the south-facing interior wall of the crater is going to be in shadow the most, and thus it will also be the place where any surface or near-surface ice will survive the longest. In this case it appears that from the bumpy nature of that residual ice it has also been sublimating away. Within it however remains the faint hint of multiple layers, suggesting about a dozen past climate cycles with each new cycle producing a new but smaller layer with less ice.

The material in the southern half of the crater floor appears to be dust formed into ripple dunes.
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Flow channels on Mars

Flow channels on Mars
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Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on May 13, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows what the scientists call a “channel and depression”, though to my eye everything looks like flow channels, descending to the east.

The drop from the narrow northern channel to wider southern channel is about 200 feet, with the small crater on the left sitting about halfway between. To our Earthbound eyes, something clearly flowed downhill from that northern channel into the wider channel. What we don’t know now is what the material was that did the flowing?

Was it liquid water? Glaciers? The overview map below provides some context, though it doesn’t actually provide an answer.
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Big mountains everywhere inside Valles Marineris

Big mountains in Valles Marineris
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While the giant canyon Valles Marineris on Mars is known best as the biggest known canyon in the solar system — large enough to cover the continental United States several times over — that size tends to diminish the mountainous nature of its interior. Today’s cool image attempts once again (see for example these earlier posts here, here, here, here, and here) to illustrate that stupendous and mountainous nature.

The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on May 15, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). The goal of the picture was to get a better view of the numerous layers of this terraced cliff wall. What I see, however from my tourist’s perspective, is a steep wall that descends almost 4,500 feet from the high to the low point in just over three miles. This is as steep if not steeper than the walls of the Grand Canyon.
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Where the Martian landscape begins to dry out

Where Mars begins to dry out
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Today’s cool image to the right, cropped, reduced, and sharpened to post here, provides us a glimpse at the lower mid-latitudes of Mars where the terrain is beginning to dry out as we move south. The picture was taken on April 29, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO), and shows what the scientists label “large linear features.”

The main north-south ridge is only about 20-25 feet high, and its meandering nature (which can be seen more clearly in the full image) suggests it is possibly an inverted channel, formed when the bed of a former canyon gets compressed by the water or ice that flows through it, and when the surrounding terrain gets eroded away that channel bed becomes a ridge.

These ridges however could also possibly be volcanic dikes, where magma had pushed up through fractures and faults to form these more resistant ridges.
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The very tip of a thousand-mile-long crack on Mars

The very tip of a 1000-mile-long Martian crack
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Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on June 22, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows what the scientists label as “The tip of Cerberus Fossae,” a thousand-mile-long crack in the surface of Mars formed when the ground was pulled apart by underground forces.

If you look closely at the picture’s right edge, you can see that beyond the end of the fissure it actually continues but appears filled with material. In the full picture this however is the end of the crack. Beyond this point the ground is as smooth and as generally featureless as seen within the picture itself, and as also shown in this MRO context camera view of the same area.

Cerberus Fossae is actually three parallel cracks, with this the northernmost one. The eastern tip of the middle crack was previously highlighted in a cool image in July 2022.
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A Martian wedding cake surrounded by brain terrain

Brain terrain surrounding a Martian wedding cake
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Of all many cool images I’ve posted, today might take the cake (pun intended) for the best illustration of the alien nature of Mars. The picture to the right, cropped, reduced, and sharpened to post here, was taken on June 28, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO), and shows what the scientists simply label as “flow features.”

I personally don’t see any obvious flow features in the full image, unless one wants to call the brain terrain that covers this entire plain a flow feature. Brain terrain is a feature unique to Mars whose origin remains a mystery to geologists. As noted by scientists in captioned MRO image in 2019:

You are staring at one of the unsolved mysteries on Mars. This surface texture of interconnected ridges and troughs, referred to as “brain terrain” is found throughout the mid-latitude regions of Mars.

…This bizarrely textured terrain may be directly related to the water-ice that lies beneath the surface. One hypothesis is that when the buried water-ice sublimates (changes from a solid to a gas), it forms the troughs in the ice. The formation of these features might be an active process that is slowly occurring since HiRISE [MRO’s high resolution camera] has yet to detect significant changes in these terrains.

The wedding cake inside the small crater to the upper right only adds to the alienness of this terrain.
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Mars’ endless cycles of glacial activity

Overview map

Mars' endless cycles of glacial activity
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While the images being sent to us from Mars Reconnaissance Orbiter (MRO) repeatedly show features that appear convincingly like glaciers, the data is also beginning to tantalize us with evidence of the endless glacial cycles that have occurred on Mars.

The picture to the right, cropped, reduced, and sharpened to post here, was taken on June 27, 2023 by MRO’s high resolution camera. The red dot in the inset of the overview map above shows the location, the western flanks of an apron that surrounds a 3,800-foot-high mesa in the chaos region Deuteronilus Mensae, the western end of the 2,000-mile-long mid-latitude strip of chaos regions I dub glacier country, because every image seems to show some form of glacial feature.

Today’s picture is no different. The apron shown here drops the last 1,000 feet of the mesa’s total 3,800-foot height, during which it shows dozens of what the scientists label “parallel lines.” These lines likely reveal the layers of glacial ice in this apron, with the older layers larger and more extensive. Apparently, with each growth cycle the glacier obtained less snow from the atmosphere, so the more recent layers grew less.

In other words, the amount of water on Mars has been declining with time.

Untangling these numerous layers will undoubtedly give us a remarkably detailed history of Mars entire geological history. Unfortunately, that untangling cannot happen until we have boots on the ground, on Mars, able to drill core samples from many different places.

The inexplicable behavior of Martian dust devils

The inexpicable behavior of Martian dust devils
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Today’s cool image illustrates the puzzling inclination of Martian dust devils to strongly favor specific regions on the Martian surface, for reasons that at present no one can confidently explain.

The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on June 28, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows a plethora of dust devil tracks, almost all of which have an east-west orientation. Moreover, the tracks seem uninfluenced by the surface topography, continuing on their path without deviation, even as they cross cliffs, craters, and mounds. The orientation tells us the direction of the prevailing winds, though I don’t know if those winds blow to the east or to the west.

What makes this image revealing is that a gathering of such dust devil tracks is seen so rarely in other MRO high resolution photographs. I look at a lot of MRO pictures, and though dust devil tracks are not rare, most images don’t show this many. Apparently, there are specific conditions on Mars that cause a lot of tracks to appear in specific locations, either because atmospheric conditions create a lot more dust devils, or the ground conditions allow the tracks to become more visible.
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An avalanche in the West Virginia of Mars

An avalanche in the West Virginia of Mars
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Cool image time! The picture to the right, rotated, cropped, and reduced to post here, was taken on June 27, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).

I have cropped it to focus on this one hill, about 900 feet high (though the elevation data from MRO is somewhat uncertain at this resolution), because of that major landslide on its northern slopes. At some point in the past a major piece of the exposed bedrock at the top broke off and slide about halfway down the mountain, almost as a unit, settling on the alluvial fill that comprises the bottom half of the hill’s flanks.

The bedrock surrounding the peak is also of interest because of its gullies, all of which were created by downward flowing material. Was it ice? Water? Sand? Or maybe a combination of two or three? If water or ice was involved it was a very long time ago, as this location is in the dry equatorial regions of Mars. There is little known near-surface ice here.
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The impact that almost cracked Mars open

An irregular pit chain on Mars
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Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on June 25, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows what the scientists label an “irregular pit chain,” made up of a series of depressions scattered along a line that extends more than sixty miles to the northeast and to the southwest, beyond the edges of this high resolution close-up.

The chain likely indicates the existence of a fault line, or crack that created a void underground in which surface material is sinking. What makes this crack or fault line significant is how it and other similar fissures or cracks map across the Martian surface, extending for thousands of miles far beyond this particular pit chain and covering almost half the planet. In aggregate they imply the occurrence of past geological events so stupendous they are difficult to comprehend.
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Residual ice on the shaded north-facing slope of northern Martian crater

Residual ice on Mars?
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Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on April 10, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). In the headline I am speculating a bit when I call that pile of material bunched up against the interior slope of this unnamed 18-mile-wide crater residual ice. No data is available to me that proves that assumption, but the look, the location, and the general previous data from Mars all tell me that this is what it is.

First, the location within the crater. Everyone who has lived in the northern latitudes where snow falls knows that snow will remain in the shaded slopes that face north — where less direct sunlight falls — much longer than in places where there is more sunlight. You can sometimes even find this residual snow as late as June and July in some such spots.

This phenomenon will be no different on Mars. In those alcoves this material, which looks exactly like glacial features found in many other places in the mid-latitudes of Mars (such as inside the small half-mile-wide crater in the lower left), is well protected, so that even when the rest of the ice sublimated away within the crater it remained. The cliff wall rises five hundred feet to the south, blocking sunlight so that for most of the year little directly sunlight touches this surface.
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The flat and mostly featureless flood lava plains of Mars

The flat and mostly featureless lava plains of Mars
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Cool image time! The picture to the right, rotated, cropped, reduced, and sharpened to post here, was taken on July 3, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). Dubbed a “terrain sample” by the camera team, it was likely taken not as part of any scientist’s specific research program but to fill a gap in the camera’s schedule in order to maintain its proper temperature. When the camera team needs to do this they try to pick something of interest that is below during that gap.

In this case MRO was over the vast flood lava plains of Mars where for many hundreds of miles the only features are small variations produced from different overlapping lava flood events. The layers of lava in this region in fact appear so thick that there are relatively few places where the older topography still sticks up through the lava. In the case of this picture, the ridges might indicate such buried topography, but they also might simply be dikes of lava, pushed up through fissures from underground.
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The icy mountains close to where SpaceX hopes to land Starship on Mars

The icy mountains near Starship's landing site on Mars
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Cool image time! The photo to the right, rotated, cropped, reduced, and sharpened to post here, was taken on June 25, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). Labeled as showing “flow features” by the scientists, it gives us a nice example of many of the different types of glacial and near-surface ice features seen routinely in the Martian latitudes above 30 degrees, especially in the northern hemisphere.

First there is the apron around the mound. Its layering suggests the many cycles that Mars’ climate has undergone as its rotational tilt swung back and forth from as low as 11 to as much as 60 degrees (it is presently at 25 degrees).

The mound, with those two depressions at its peak, suggests the possibility that it is some form of ice/mud volcano, similar to the suspected ice/mud volcanoes routinely seen in the northern lowland plains of Utopia Basin.
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Martian craters or volcanoes?

Martian craters or volcanoes?
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Cool image time! The picture to the right, cropped and reduced to post here, was taken on June 30, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). The scientists label these features “cones” because many of the depressions sit on top of a mound or hill, suggesting some form of volcanic feature, either from erupting lava, ice, or mud.

Yet, are they volcanoes? Some or even many could instead be impact craters, created when a asteroid broke up during infall, creating a spray of bolides. Erosion of surrounding terrain can create what scientists call pedestal craters, but if all these craters were from an impact than all would either be pedestal craters, or not. Instead, we have a mix of some craters above and others level with the terrain.
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A hiking paradise on Mars!

A hiking paradise on Mars
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Cool image time! The picture to the right, cropped, reduced, sharpened, and annotated to post here, was taken on May 21, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows one of Mars’ more impressive mountains with the Sun somewhat low in the western sky, resulting in the long dark shadows on the eastern slopes.

The line is my quick attempt to mark the obvious route that would be taken along that ridge line to get from the bottom to the top. This could be a hiking trail, or a road. In either case, the elevation gain from the bottom of the ridge to the plateau on top would be about 3,900 feet in about a mile and a half, very steep for Earth — at approximately a 26 degree grade — but probably quite doable in the one-third Martian gravity.

The lower end of my proposed route however is hardly the bottom of the mountain. The slope, now alluvial fill made up of dust and debris from above, continues downhill for another 5,400 feet. All told, from top to bottom the elevation gain is about 9,300 feet over 8.5 miles.
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The dry and mountainous terrain west of Jezero Crater

The dry and mountainous terrain west of Jezero Crater
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Since my earlier update today about Perseverance and Ingenuity mentioned the very diverse and strange geology known to exist west of Jezero Crater and where the rover is eventually headed, I thought it worthwhile to post another cool image of that terrain.

The picture to the right, rotated, cropped, reduced and sharpened to post here, was taken on May 22, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). Labeled a “terrain sample” image, the location was likely chosen by the camera team in order to fill a gap in the camera’s schedule so that they can maintain its proper temperature. Having a gap that put the spacecraft over this region to the west of Jezero was however a great opportunity to get another look at this rocky, mountainous, and very parched terrain, located in Mars’ very dry equatorial regions.
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The first glacial evidence found on Mars back in 2007

Glaciers on Mars?
Click for original image.

Cool image time! The picture to the right, cropped, reduced, sharpened, and annotated to post here, was taken on January 3, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO). It shows the eastern wall of what the scientists call a graben, a large depression caused when the ground inside the depression suddenly shifted downward.

The elevation difference between the high and low points is about 3,500 feet. The streaks on the lower half of the cliff wall are slope streaks, a phenomenon unique to Mars that remains at this moment unexplained. Though the streaks resemble avalanches, they do not change the topography in any way, have no debris pile at their base, and appear instead to be a stain that appears at random times of the year that fades with time.

What is intriguing about this picture however is the wavelike floor on its western half. At first glance these waves suggest some form of dust dunes or lava flows, but neither conclusion appears correct. Instead, we are looking at what was one of the first discoveries on Mars of what scientists have determined to be glacial features.
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The wind-scoured dusty and cratered dry tropics of Mars

The wind-scoured dusty and cratered dry tropics of Mars
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Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on June 2, 2023 by the high resolution camera on Mars Reconnaissance Orbiter (MRO), and shows one small area in Martian equatorial regions where the main features are a dusty plain interspersed with craters, not entirely dissimilar to the Moon .

In the picture the northwest-to-southeast orientation of ridge-lines, plus the position of divots with their steep and deep end all on the northwest side, all suggest the prevailing winds here blow in the same direction, from the northwest to the southeast.

We are looking at a very ancient terrain. Many of these craters likely date from the early bombardment period of the solar system, just after the planets had formed but there was still a lot of objects around crashing into them.
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