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Figure F68. Comparison of gamma ray logs recorded through the drill pipe in Holes U1351B and U1351C and gamma ray track data from Hole U1351B cores. NGR = natural gamma radiation track measurements. Sand layers described in cores (red arrows) correspond to low peaks in gamma ray logs, indicating a gamma ray response to lithology despite signal attenuation by the drill pipe. Additional sand layers may be present (red arrows with question mark) in the uppermost 84 m, even where not recovered by coring.

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