Site summaries (continued)

Site SHR-3B (Shirshov Ridge): Pliocene

56°26.1′N, 170°37.2′E (WGS 84) [Russia]
Water depth (m)
Target drilling depth (mbsf):
Approved maximum penetration (mbsf):
Previous drilling in area:
DSDP Site 191 (farther southwest) and 192 (farther south)
Approved at relocated position at track time 8:20 on USNS Bartlett Cruise 02, Leg 055, 236 Day, 1970, 07:00–09:00 (EPSP December 2005)
Survey coverage (track map, seismic profile); sediment cores:
USNS Bartlett Cruise 02, Leg 055, 236 Day (1970) 14:00-13:15:
• Track maps (Figs. AF45, AF46, AF47)
• Single-channel seismic (Figs. AF48, AF49)
• Seismic velocity: DSDP Site 189 measurement; ref. interval velocity by USGS R/V Lee Cruise L6-80, Line 6
• Multiple cores (16 cm)
Objective (see text for complete details):
Monitor deep and intermediate water masses flowing out of the Bering Sea to the Pacific and surface conditions in the western Bering Sea.
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 microfossils

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