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Table T1. Planned drill site details.

Site Location
(latitude,
longitude)
Water
depth
(m)
Penetration
(mbsf)
Expected
sediment type
Estimated
bottom age
Site-specific
objectives
Planned Approved
Bowers Ridge
BOW-12B 53°24.0′N, 179°31.3′W 1313 745 745 Hemipelagic silty clay with siliceous and calcareous microfossils late Miocene Entry location for Pacific water, shallow end of depth transect
BOW-14B 54°02.0′N, 179°00.5′E 2166 555 600 Hemipelagic silty clay with siliceous microfossils late Miocene Entry location for Pacific water, deep site on the ridge
BOW-15A 54°49.7′N, 176°55.0′E 837 165 165 Hemipelagic silty clay with siliceous and calcareous microfossils middle Pliocene Shallow end of depth transect
Gateway
GAT-3C (alternate) 59°03.0′N, 179°12.2′W 3209 ~500 745 Silty clay with siliceous microfossils late Miocene Gateway to the Arctic, deep end of depth transect
GAT-4C 57°33.4′N, 175°49.0′W 1975 745 745 Hemipelagic silty clay with siliceous and calcareous microfossils late Miocene Gateway to the Arctic
NAV-1B (alternate) 60°9.192′N, 179°28.202′W 1130 150 150 Intermittently laminated hemipelagic silty clay with siliceous and calcareous microfossils Pleistocene Late Pleistocene history of Bering Sea at submillennial timescales
Kamchatka Strait (Russia)
KST-1B 55°55.6′N, 164°54.9′E 3435 200 200 Hemipelagic silty clay with siliceous microfossils Pliocene Gateway to the Pacific, western end, deep end of depth transect
Shirshov Ridge (Russia)
SHR-1B (alternate) 57°19.0′N, 170°06.4′E 963 200 200 Hemipelagic silty clay with siliceous and calcareous microfossils Pliocene Sea ice and water mass distribution in northeast region
SHR-3B 56°26.1′N, 170°37.2′E 2232 200 200 Hemipelagic silty clay with siliceous microfossils Pliocene Sea ice and water mass distribution, distal to Pacific water
Umnak Plateau
UMK-4D 54°40.2′N, 169°58.9′W 1900 200 200 Hemipelagic silty clay with siliceous and calcareous microfossils Pliocene Sea ice and water mass distribution, distal to Pacific water
UMK-3B (alternate) 54°25.1′N, 170°14.6′W 1898 200 200 Hemipelagic silty clay with siliceous and calcareous microfossils Pliocene Sea ice and water mass distribution, distal to Pacific water

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