Site summaries (continued)

Site SHR-1B (Shirshov Ridge): Pliocene

57°19.0′N, 170°06.4′E (WGS 84) [Russia]
Water depth (m)
Target drilling depth (mbsf):
Approved maximum penetration (mbsf):
Approved at relocated position (previously SHR-1A) (EPSP December 2005)
Previous drilling in area:
DSDP Sites 191 (farther southwest) and 192 (farther south)
Approved at relocated position at track time 0:30 on USNS Bartlett Cruise 02, Leg 054, 235 Day, 1970, 23:14–01:20 (EPSP December 2005)
Survey coverage (track map, seismic profile); sediment cores:
USNS Bartlett Cruise 02, Leg 054, 235 Day (1970) 23:14–14:00:
• Track maps (Figs. AF45, AF46)
• Single-channel seismic (Figs. AF50, AF51)
• Seismic velocity: DSDP Site 189 measurement; ref. interval velocity by R/V Lee Cruise L6-80, Line 6
Objective (see text for complete details):
Monitor subsurface water mass flowing out of the Bering Sea to the Pacific; could expand vertical extent of reconstruction of subsurface water mass conditions.
Reconstruct Pliocene–Pleistocene high-resolution paleoceanography and investigate Bering/Arctic Gateway history and sea ice and water mass distribution in the northeast region.
Drilling/coring program:
Holes A, B, and D: APC with core orientation to 200 mbsf, Hole C to 25 mbsf
Temperature measurements: 3 APCT-3
Downhole logging program:
Wireline logging: triple combo, FMS-sonic
Anticipated lithology:
Hemipelagic silty clay with siliceous and calcareous microfossils

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