Examples of (a) monomict, densely packed megabreccias (ESP_033572_1995; Outcrop ID 64 in Data Set S1), (b) layered, densely packed megabreccia as indicated by red arrows (ESP_035062_1995; Outcrop ID 67 in Data Set S1), (c) single megabreccia (ESP_053523_1985; Outcrop ID 40 in Data Set S1), (d) polymict, densely packed megabreccia (ESP_037185_2010; Outcrop ID 50 in Data Set S1), and (e) scattered megabreccia (PSP_008861_2000; Outcrop ID 108 in Data Set S1). (f) Megabreccia outcrops of different textures plotted by radial distance from the center of Isidis basin and MOLA elevation. The black line in the background represents the average MOLA elevation profile of the study area. (g) Megabreccia outcrops of different textures plotted in plan view with MOLA background. All HiRISE footprints studied are outlined in dark gray.