One of the most compelling pieces of evidence comes from the discovery of ripple textures in a rock layer known as the “Marker Band”. These ripples, formed by waves in a shallow lake, suggest that Mars once hosted a body of water capable of generating such disturbances. The presence of hard rocks within the Marker Band implies that the area underwent significant erosion due to water activity.
Evidence of a Wet Past
Another indication of Mars’ aquatic past lies in a valley named Gediz Vallis, where researchers believe a small river once flowed. The valley exhibits signs of wet landslides, which sent car-sized boulders and debris cascading to the bottom, forming a distinct layer on top of older stratifications. This layer is considered one of the youngest features on Mount Sharp, further emphasizing the significance of water in shaping the Martian landscape.