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The mounds are geochemically similar to the plains of Oxia Planum, the future landing site of the ExoMars Rosalind Franklin rover. Thus, when ExoMars is exploring these plains, it will also be exploring widespread regional environments beyond the landing site alone.

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These erosional remnants contain hundreds of meters of clay-rich stratigraphy, indicating liquid water was present here for a substantial amount of time. The clays are bounded above and below by unaltered material, documenting (almost) the entire aqueous history of the region.

The headlines: Mars' highlands once extended hundreds of kilometres further north in the Chryse Planitia region. In the Noachian, between 3.8 and 4.0 billion years ago, erosion removed the edge of the highlands, leaving remnant mounds.

Peter Grindrod @petergrindrod.bsky.social · 08/01/2025

I am happy to announce the publication of the final part of my @openuniversity.bsky.social PhD work, which has been expanded during my UKSA postdoc @nhm-london.bsky.social: "Dichotomy retreat and aqueous alteration on Noachian Mars recorded in highland remnants”, in @naturegeosci.bsky.social.

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Reposted by Dr. Joe McNeil

Some parts of Mars are deliciously colourful. Here's part of the western Ladon basin, as seen in false colour by the CaSSIS instrumnet on the TGO spacecraft. Image no. MY35_012192_201_0, taken in January 2021. (Credit: ESA/TGO/CASSIS/Peter Grindrod)

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Super excited to start fresh here (and by “start fresh”, I mean “lurk in the background and occasionally post when I remember”, as is tradition).

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My research covers many aspects of martian stratigraphy, geomorphology, and mineralogy, and I’m always up for chatting about planetary science in general.

I use remote sensing data to study the role of water on ancient Mars. Basically, if it was once wet, is now rock, and happens to be on Mars, I’m interested in investigating it from orbit. But I’m more than happy to look at any and all planetary surfaces!