"(A) Engraving from Gorham’s Cave. (B) Engraved lines L1–L13. Dark gray and light gray identify old and recent breaks, respectively. (SI Appendix, Fig. S21 shows the order of the engraving lines, breaks, and formation of the duricrust.) Note that the “Analysis North” shown here was used only to describe the order of the engraving lines."
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"(A) Engraving from Gorham’s Cave. (B) Engraved lines L1–L13. Dark gray and light gray identify old and recent breaks, respectively. (SI Appendix, Fig. S21 shows the order of the engraving lines, breaks, and formation of the duricrust.) Note that the “Analysis North” shown here was used only to describe the order of the engraving lines."

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