The PDF file includes:

• Section S1. Overview of samples
• Section S2. Breccia thermal history
• Section S3. NRM
• Section S4. Paleointensities
• Section S5. VRM experiments
• Section S6. Magnetization carriers
• Section S7. ⁴⁰Ar/³⁹Ar, ³⁸Ar/³⁷Ar, and ⁴⁰Ar/³⁶Ar chronometry
• Fig. S1. Photomicrographs of 15465.
• Fig. S2. Photomicrographs of 15015.
• Fig. S3. Schematic time-temperature transformation curve for a generic cooling melt.
• Fig. S4. Estimated melt cooling rate for breccias 15465 and 15015.
• Fig. S5. Temperature distribution inside a clast with a one-dimensional contact with a cooling melt.
• Fig. S6. Temperature distribution inside a spherical clast surrounded by a linearly cooling melt.
• Fig. S7. Location of our 15465 subsamples relative to the parent sample 15465, 44, 115.
• Fig. S8. Magnetization directions in 15465 inferred from PCA.
• Fig. S9. AF demagnetization of 15465.
• Fig. S10. Thermal demagnetization of 15465.
• Fig. S11. Location of our 15015 subsamples and cuts relative to the parent samples 229a1, 229a3, and 229b.
• Fig. S12. Magnetization directions in 15015 inferred from PCA.
• Fig. S13. AF demagnetization of 15015 glass subsamples.
• Fig. S14. Thermal demagnetization of 15015 subsamples.
• Fig. S15. Magnetic overprints in 15015 subsamples from bandsaw cutting at JSC.
• Fig. S16. Paleointensity estimates for breccia 15465 matrix glass and clast samples.
• Fig. S17. Paleointensity estimates for breccia 15015 subsamples.
• Fig. S18. Thermal paleointensity experiments for breccia 15465 subsamples.
• Fig. S19. Thermal paleointensity experiments for breccia 15015 glass subsamples.
• Fig. S20. Paleointensity fidelity tests for breccia 15465.
• Fig. S21. Paleointensity fidelity tests for breccia 15015.
• Fig. S22. VRM acquisition by 15465 glass.
• Fig. S23. VRM acquisition by 15015 glass.
• Fig. S24. Electron microprobe analysis of magnetization carriers in 15465.
• Fig. S25. Hysteresis and IRM acquisition/demagnetization curves for 15465 glass and clast subsamples.
• Fig. S26. Dunlop-Day plot showing the domain state of breccias compared to other lunar rocks analyzed in the MIT Paleomagnetism Laboratory.
• Fig. S27. FORC analysis of 15465 breccia subsamples.
• Fig. S28. Electron microprobe analysis of magnetization carriers in 15015.
• Fig. S29. Hysteresis and IRM acquisition/demagnetization curves for 15015 glass subsamples.
• Fig. S30. FORC analysis for 15015 glass.
• Fig. S31. Ar release spectra for 15465 glass subsample 6-4-1.
• Fig. S32. Ar release spectra for 15465 clast subsample 6-2.
• Fig. S33. Ar release spectra for 15015 glass subsample 229b1.
• Fig. S34. Ar release spectra for 15015 clast subsample 229a1a.
• Fig. S35. Ar three-isotope plot for 15465 glass subsample 6-4-1.
• Fig. S36. Ar three-isotope plot for 15465 clast subsample 6-2.
• Fig. S37. Ar three-isotope for 15015 glass subsample 229b1.
• Fig. S38. Geologic and magnetization history of breccia 15465.
• Fig. S39. Geologic and magnetization history of breccia 15015.
• Table S1. Comparison between the glass compositions of breccias 15465, 15015, and 15498.
• Table S2. Estimated cooling rate for 15465 and 15015 lunar rock compositions.
• Table S3. Distances between 15465 matrix glass melt interface and our clast subsamples.
• Table S4. NRM components during AF or thermal demagnetization for 15465 subsamples.
• Table S5. NRM components during AF or thermal demagnetization for 15015 subsamples.
• Table S6. Paleointensity estimates for 15465.
• Table S7. Paleointensity upper limits for 15465 and 15015 based on the AREMc method.
• Table S8. Paleointensity estimates for 15015.
• Table S9. Statistics for thermal paleointensity experiments for breccias 15465 and 15015.
• Table S10. pTRM check parameters for double-heating experiments.
• Table S11. Paleointensity fidelity tests for breccias 15465 and 15015.
• Table S12. Upper paleointensity limits on breccias using different paleointensity methods.
• Table S13. WDS of 15465 metal grains.
• Table S14. Rock magnetic parameters for 15465 and 15015 subsamples.
• Table S15. WDS of 15015 metal grains.
• Table S16. ⁴⁰Ar/³⁹Ar degassing data for 15465 glass 6-4-1.
• Table S17. ⁴⁰Ar/³⁹Ar degassing data for 15465 clast 6-2.
• Table S18. ⁴⁰Ar/³⁹Ar degassing data for 15015 glass 229b1.
• Table S19. ⁴⁰Ar/³⁹Ar degassing data for 15015 clast 229a1a.
• Table S20. ⁴⁰Ar/³⁹Ar, ⁴⁰Ar/³⁶Ar, and ³⁸Ar/³⁶Ar analyses of breccia 15465.
• Table S21. ⁴⁰Ar/³⁹Ar, ⁴⁰Ar/³⁶Ar, and ³⁸Ar/³⁶Ar analyses of breccia 15015.
• Table S22. Modern paleointensity analyses of Apollo samples.
• References (51–103)

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Other Supplementary Material for this manuscript includes the following:

• Database S1 (.zip format). Demagnetization data on 15465 and 15015.