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Map of all 173 megabreccia cataloged in this study within the Noachian Basement Group (red circles, overlapping at this spatial scale) along with megabreccia locations compiled in Tornabene et al. (2013) (yellow starts). Inferred inner and outer ring of Isidis basin from Figure 1 shown as black stippled lines. All analyzed HiRISE image footprints in black.
