maps13486-sup-0002-supinfoS1.docx

Fig. S1. BSE image of WIS 91600 having small magnetite inclusions and magnetite nests in the clastic matrix Dhofar 225. This anomalous CM rock seems to be modified by secondary processes (Fig. S2). In the beginning of this study, the sample was measured but later excluded from the classification because the measurements indicate that the samples did not contain real TCIs, but areas looking like TCIs turned out to be composed of sulfidic or metallic components rather than phyllosilicates. Another reason for excluding this meteorite is its oxygen isotope composition, which is more enriched in 17O and 18O than those of other CM chondrites and plots next to the Belgica group (see Meteoritical Bulletin Database; https://www.lpi.usra.edu/meteor/).