Layers of Martian ash
Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on August 31, 2025 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).
The science team labels this as “layering”, which surely is an apt description. As the latitude is 9 degrees south, this location is within the dry tropics of Mars, where no near surface ice has yet been found. Thus, the terraced layers of this low 20-foot-high mesa are not indicative of the many glacial climate cycles found in the mid-latitudes.
Instead, we are looking at sedimentary layers of rock or dust, laid down over time and later exposed by erosion.
So what caused the layers? And what is causing them to be exposed, one by one? As always the overview map helps provide a possible explanation.
» Read more
Cool image time! The picture to the right, cropped, reduced, and sharpened to post here, was taken on August 31, 2025 by the high resolution camera on Mars Reconnaissance Orbiter (MRO).
The science team labels this as “layering”, which surely is an apt description. As the latitude is 9 degrees south, this location is within the dry tropics of Mars, where no near surface ice has yet been found. Thus, the terraced layers of this low 20-foot-high mesa are not indicative of the many glacial climate cycles found in the mid-latitudes.
Instead, we are looking at sedimentary layers of rock or dust, laid down over time and later exposed by erosion.
So what caused the layers? And what is causing them to be exposed, one by one? As always the overview map helps provide a possible explanation.
» Read more
















