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Figure 5. Plot of cosmogenic ¹⁰Be vs. depth in sediment column at Site 1040 (Leg 170). Made by cosmic rays in the atmosphere and decaying with a 1.5-m.y. half-life, measurable ¹⁰Be enrichments are seen in sediments younger than 7-10 Ma. The underthrust sediments beneath the décollement have high values typical of the incoming sediment section. Throughout the prism sediments of the upper plate, ¹⁰Be concentrations are very low, typical of sediments that are older than 3-5 Ma.

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