Time on hole (days): 5.2 Seafloor depth (m DRF): 4251.3 Seafloor depth calculation method: APC calculated depth Rig floor to sea level (m): 10.84 Drilling system: 11-7/16 inch APC/XCB bit with 136.63 m long BHA Penetration depth (m DSF): 617.0 Cored interval (m): 617.0 Recovered length (m): 402.11 C.-F. Li et al. Site U1431 IODP Proceedings 5 V o l u m e 3 4 9

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Abstract

Seafloor depth calculation method: Seafloor tag confirmed by subsea camera Rig floor to sea level (m): 11.00 Drilling System: 18-1/2 inch tricone bit with 142.84 m BHA Penetration depth (m DSF): 62.0 Cored interval (m): 0 Drilled interval (m): 62.0 Drilled interval (no.): 1

Hole U1434A An RCB bottom-hole assembly (BHA) was assembled with a new RCB C-7 bit. The core barrels were spaced out at the surface, and the 172.07 m BHA assembled. The BHA was lowered to 4000.9 m below rig floor (mbrf), and the top drive was picked up and spaced out to 4020.0 mbrf to spud Hole U1434A. A center bit