Yesterday we went to the Murphy’s Canyon. I noticed interesting crystallization of gypsum in the form of ridges sticking from the
surface.

The images taken by different Martian rovers (e.g. Curiosity) show that such crystallization occurs on Mars, which proves the activity of water. In a different place there I also noticed pits caused by characteristic dissolution of sandstone by aqueous solutions.

Such dissolution is a good comparison of chemical weathering by which we can recognize the existence of sandstones and identify them on Mars.

Best regards,

Natalia Zalewska
Commander, MDRS Crew 176
and Crew Geologist