The Medusae Fossae Formation (MFF) spans a ∼5,000 km region along the martian dichotomy boundary. The deposit comprises the large massifs Amazonis Mensa, Eumenides Dorsum, Lucus Planum, Aeolis Planum, Zephyria Planum, and Gordii Dorsum, and lower-lying materials with a range of areal coverage. Estimates of MFF deposit volume range from 1.4 × 10 6 km 3 (Bradley et al., 2002) to 1.9 × 10 6 km 3 (Hynek et al., 2003). Long inferred to be comprised of friable, low-density material, the MFF exhibits extensive wind erosion features such as yardangs, and is an evident source of sediments both regionally (Morgan et al., 2015) and perhaps planet-wide (Ojha et al., 2018). Its deposition has been attributed to a range of mechanisms, with many authors proposing pyroclastic or ignimbrite eruptions (e.g.,