Johnston Atoll

EX1504L4

NOAA expedition EX1504 Leg 4 sampled seamounts in the deep waters of the Johnston Atoll region of the Pacific using the submersible Deep Discoverer. OSU marine repository archives the rock samples collected during the expedition. Archived samples include basalts, fossil corals, phosphorites and more. Below are the samples recovered from each dive.

For more information please visit the dedicated NOAA Page and Background Information

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Dive sample tables: click to expand

EX1504L4-D2 (SW Niiahu Pinnacle)
EX1504L4-D4 (Johnston Atoll)

Sample Location Rock Type Description Images
OSU-EX1504L4-D4-2 16.66°N, 169.35°W Coral A large fossilized coral. Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4
EX1504L4-D10 (Mid-Karin Ridge)

Sample Location Rock Type Description Images
OSU-EX1504L4-D10-1 16.54°N, 168.21°W Basalt A heavily altered aphyric basalt with large circular vesicles… Image 2Image 3Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4Image 4