In this project, we employ a wide range of radar sounding and geologic mapping techniques to reveal the nature of icy sedimentary deposits comprised within the so-called basal unit at the north pole of Mars. The overarching objective is to study the stratigraphic architecture, composition, and the nature and timing of events that are recorded in the stratigraphy of this unit and ultimately reconstruct its evolution. Its large volume and volatile content make it one of the largest water ice reservoirs on the planet, likely the third largest after the two polar caps. This unit also contains a unique record of polar geologic processes and climate events that occurred over the last ~3 Ga of Mars’ geologic history. Although based on Mars, this project employs techniques that are commonly used for sequence stratigraphy and geomorphological studies on Earth.