A window to the Martian past
Phyllosilicates (clays) on Mars, such as the light—toned outcrops at Mawrth Vallis shown on the cover, could form during warm and wet intermittent periods in a generally cold early Mars. This model solves the contradiction on the state of ancient Mars between mineralogical and geomorphological observations and the most accepted climate theories.
See Bishop et al. and News & Views by Bridges