Science Advances

Supplementary Materials

The PDF file includes:

  • Supplementary Text
  • Fig. S1. Overview of offshore datasets, covering the MnIS bed, used in the mapping compilations.
  • Fig. S2. Summary Quaternary geological cross-section and sediment cores from the MnIS bed (west trough).
  • Fig. S3. Bathymetric cross-sectional profiles of GZWs identified within the MnIS trough.
  • Fig. S4. GZW morphological metrics derived in this study.
  • Fig. S5. Probability density function plots of 10Be TCN exposure ages used in Bayesian sequence model.
  • Fig. S6. Single-grain De distributions determined for OSL dating of glaciofluvial ice-marginal sediments.
  • Fig. S7. Bayesian sequence modeling of chronology derived in this study.
  • Fig. S8. Submarine geomorphological and geological evidence of ice-shelf breakup.
  • Fig. S9. Diagnostic sediment facies within two key cores (JC123-031PC and JC123-021PC) (see figs. S2 and S8 for location within the west and east troughs, respectively).
  • Fig. S10. Conceptual model of ice-stream/ice-shelf threshold behavior conditioned by bed strength and bed topography.
  • Table S1. Rock strength classifications (according to BS 5930) for geological units at MnIS bed.
  • Legend for data file S1
  • References (7088)

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Other Supplementary Material for this manuscript includes the following:

  • Data file S1 contains the following supplementary tables (Excel file):
  • Table S2. Sample, chemistry, AMS, and blank data for all 10Be samples presented and used in this study.
  • Table S3. TCN exposure-age production-rate comparison tables.
  • Table S4. Results of TCN exposure-age dating presented and used in this study and reduced χ2 analysis.
  • Table S5. Results from OSL dating, including the environmental dose rates to grains of quartz.
  • Table S6. Radiocarbon sample data and results of radiocarbon analyses presented in this study.
  • Table S7. Data for exposure age determination (CRONUS).
  • Table S8. Input for CRONUS online calculator.
  • Table S9. Input for CREp (Cosmic Ray Exposure program) for calculating exposure ages.
  • Table S10. Age model outlier-detection analysis.
  • Table S11. Bayesian sequence model (OxCal output).
  • Table S12. Summary of Bayesian model boundaries, ages, retreat rates and uncertainties.

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