Gullies with Color Anomalies

This observation from NASA's Mars Reconnaissance Orbiter (MRO) is an oblique view of gully deposits from the steep slope of an impact crater.

The deposits with anomalous (bluish) colors may reveal very recent activity, not yet homogenized by dust deposition, or there may be sand preferentially trapped in some places to give this appearance.

https://photojournal.jpl.nasa.gov/catalog/PIA21602