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Figure F3. Map of the ocean floor age, based on age grid by Müller et al. (2008), revised version 3 ( Symbols represent DSDP, ODP, and IODP holes drilled in ocean crust >100 mbsf from 1974 to 2011. Holes deeper than 500 m in intact and rifted oceanic crust are labeled. This map does not include “hard rock” drill holes in oceanic plateaus, arc basement, hydrothermal mounds, or passive margins.

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