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Figure F1. Schematic of existing basement holes that have major penetrations into the ocean crust and upper mantle as a function of spreading rate. The lithologic units are schematically distributed vertically, meaning that the total crustal thickness and the depth of lithologic transitions are not constant with spreading rate. The vertical axis therefore is not intended to imply true crustal thickness. The relative lengths of the bars for each site indicate the maximum thickness of penetration for each hole. Dominant rock types are color-coded: green = peridotite, yellow = gabbro, red = basalt.

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