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Erin Todd peers through one of the interior layers of a sheet flow sample retrieved by dredge last night from the Galapagos Rift valley floor. Each layer of rock is about 2 to 3 centimeters thick, about 1 inch.


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Erin Todd peers through one of the interior layers of a sheet flow sample retrieved by dredge last night from the Galapagos Rift valley floor. Each layer of rock is about 2 to 3 centimeters thick, about 1 inch.

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