This PDF file includes:

• Section S1. On the nature of contamination in these analyses.
• Section S2. The shock survival of indigenous martian organics.
• Fig. S1. Same titano-magnetite grain in Nakhla as imaged and shown in Fig. 2, illustrating the chemical composition of the sample from EDX spectra taken at several points.
• Fig. S2. Same inclusion in Tissint as imaged in TEM and shown in Fig. 4A, illustrating the chemical composition of the sample from EDX spectra taken at several points.
• Fig. S3. Same inclusion as imaged in Fig. 4A and fig. S2 showing high-resolution TEM images of the measurements of lattice fringe dimensions and SAED patterns from each of the phases shown by blue arrows and reported in Fig. 4A.
• Fig. S4. NanoSIMS depth profile analysis of NWA 1950 and Nakhla.
• Fig. S5. Supplementary figure to complement Fig. 5 (ToF-SIMS analysis of Tissint); mass assignments are covered in table S2.
• Fig. S6. ToF-SIMS analysis of a fresh fracture surface of Nakhla.
• Fig. S7. ToF-SIMS analysis of a fresh fracture surface of NWA 1950.
• Table S1. Summary of d-space measurements on the areas marked in fig. S3 and the mineral identification from the International Center for Diffraction Data database.
• Table S2. This table pertains to Fig. 5 and fig. S5 and summarizes the mass peaks used to make the chemical designations (peak assignments) shown in these images.
• Table S3. This table pertains to ToF-SIMS analysis of Nakhla in fig. S6 and summarizes the mass peaks used to make the chemical designations (peak assignments) shown in these images.
• Table S4. This table pertains to ToF-SIMS analysis of NWA 1950 in fig. S7 and summarizes the mass peaks used to make the chemical designations (peak assignments) shown in these images.
• References (60–68)

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