Large-scale crossbedding in the sandstone of this ridge on a lower slope of Mars’ Mount Sharp is typical of windblown sand dunes that have petrified. NASA’s Curiosity Mars rover used its Mastcam to capture this vista on Aug. 27, 2015, Sol 1087. Similarly textured sandstone is common in the U.S. Southwest. Credits: NASA/JPL-Caltech/MSSS See Sol … Continue reading "Curiosity Investigates Petrified Martian Sand Dunes, Contemplates Next Drill Campaign"