In the global geological map of #Mars, published by the @USGS_AstroGeo folks (led by Ken Tanaka) in 2014, the Noachian units are the brown and dark blue–grey units in the center and lower parts of the map. pic.twitter.com/0y5sxUOvKd
— 💀 Paul Third-Degree Byrne 🎃 (@ThePlanetaryGuy) October 24, 2019
via Twitter https://twitter.com/ThePlanetaryGuy
October 24, 2019 at 08:09PM
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