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Geomorphological Observations and Physical Hypotheses About Martian Dune Gullies

Nardi, Adriano; Piersanti, Antonio

We propose the hypothesis that dune gullies and seasonal "meteorological" appearances observed on the same dunes (e.g., frosting) may have a common origin. These gullies are difficult to explain through the action of liquid flow. The occurrence of a spring flowing from the crest of a dune seems impossible to explain. However, these phenomena could…

Probing the Hidden Geology of Isidis Planitia (Mars) with Impact Craters

Orosei, Roberto; Caprarelli, Graziella

In this study we investigated Isidis Planitia, a 1325 km diameter multi-ring impact basin intersecting the Martian hemispheric dichotomy, located in the eastern hemisphere, between Syrtis Major and Utopia Planitia. From Mars Orbiter Laser Altimeter gridded data we observed that in the center of Isidis the -3700 m and -3800 m isolines strike NW-SE,…