Richard Arculus (Co-chief Scientist, The Australian National University, Australia) searches for clast volcanic rock in core section samples. As the expedition drills deeper into the sediment, the presence then disappearance of evidence of volcanic activity might indicate the beginning of the Izu Bonin Mariana Arc. Dr. Arculus noted, “We are looking for compositional changes in the core samples which point to a place in time where the Arc started.” (Credit: Bill Crawford, IODP/TAMU) [Photo ID: exp351_038]

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