Table T9. Control points used to calculate sedimentation rates for Holes 1089A, 1089B, 1089C, and 1089D. Notes: Code abbreviations: DIAT = diatom, REFL = reflectance, CN = calcareous nannofossil, MAG = magnetic polarity. Event abbreviations: FO = first occurrence, LO = last occurrence, RE = reentrance, TOP = top of interval, MID = middle of interval, BOT = bottom of interval. Age assignment of marine isotope stages (MIS) according to Imbrie et al. (1984). * = datum not included in sedimentation rate calculations. Sedimentation rates at 1.07 Ma were calculated by averaging the mean depth range between the TOP of A. ingens and the BOT of C1r.1n (Jaramillo Subchron). Code Event/Zone/Chron Depth range of stratigraphic datums Age Sedimentation Top Base Mean (Ma) Rates Leg Site Hole Core Type Section Interval (cm) Depth (mbsf) Depth (mcd) Leg Site Hole Core Type Section Interval (cm) Depth (mbsf) Depth (mcd) mbsf mcd (m/m.y.) DIAT/REFL MID MIS 5.3 177 1089 B 177 17.56 23 0.099 ~128 DIAT/REFL MID MIS 5.5 177 1089 B 177 23.5 27.08 0.122 ~128 DIAT/REFL MID MIS 6.5 177 1089 C 177 26.5 30.08 0.171 ~128 DIAT/REFL MID MIS 7.1 177 1089 B 177 31.1 35.5 0.194 ~128 DIAT/REFL MID MIS 7.5 177 1089 B 177 35.45 39.2 0.24 ~128 CN FO E. huxleyi 177 1089 B 5 H 2 30 30 35.1 39.56 177 1089 B 5 H 2 130 130 36.1 40.56 35.6 40.06 0.26 ~128 DIAT/REFL MID MIS 9.3 177 1089 B 177 46 52.2 0.331 ~128 DIAT/REFL MID MIS 11.1 177 1089 B 177 52.4 55.9 0.368 ~128 DIAT/REFL MID MIS 11.3 177 1089 B 177 58.35 63.5 0.405 ~128 CN LO P. lacunosa 177 1089 A 7 H CC 51 56 63.4 67.54 177 1089 A 8 H 1 30 30 64.6 69.37 63.9 68.46 0.46 ~128 DIAT TOP A. ingens Subz. c, MIS 16.3 177 1089 B 9 H CC 15 20 80.2 89.61 177 1089 C 10 H 3 60 60 84 90.49 82.1 90.05 0.64 ~128 MAG BOT C1n (Brunhes) 177 1089 B 12 H 4 65 65 105 116.26 177 1089 B 13 H 4 20 20 114 125.26 109.5 120.76 0.78 disturbed CN Reent. Geph. medium (4-5.5µm) 177 1089 B 17 H 2 130 130 149.1 160.36 177 1089 B 17 H 2 120 120 150 161.26 149.55 160.81 0.96 disturbed DIAT TOP A. ingens Subz. b 177 1089 B 16 H CC 12 17 146.4 157.66 177 1089 B 17 H CC 18 23 155.3 166.54 86.65 162.1 1.07 ~110 MAG BOT C1r.1n (Jaramillo) 177 1089 B 17 H 3 130 130 151.6 162.86 177 1089 B 17 H 5 30 30 153.6 164.86 152.6 163.86 1.07 ~110 CN FO R. asanoi 177 1089 A 18 H 3 130 130 163.6 171.56 177 1089 A 18 H 4 30 30 164.1 172.05 163.85 171.8 1.08 ~110 CN LO Geph. large (>5.5µm) 177 1089 B 18 H CC 13 18 165.39 176.65 177 1089 A 19 H 1 120 120 170 178.01 167.69 177.33 1.24 ~110 DIAT TOP *A. ingens Subz. a 177 1089 C 21 H CC 19 24 185.2 197.83 177 1089 B 20 H CC 0 10 190.8 202.05 95.4 199.94 1.3 ~110 CN FO Geph. large (>5.5µm) 177 1089 B 20 H 6 30 30 182.88 195.56 177 1089 B 20 H CC 0 10 185.15 197.83 184.02 196.7 1.46 ~110 CN LO C. macintyrei 177 1089 A 23 H 1 120 120 208 220.3 177 1089 A 23 H 2 30 30 208.6 220.9 208.3 220.6 1.6 ~84 CN FO Geph. medium (4-5µm) 177 1089 A 23 H 4 30 30 211.6 223.9 177 1089 A 23 H 4 120 120 212.5 224.8 212.05 224.35 1.69 ~84 MAG TOP C2n (Olduvai) 177 1089 B 23 H 7 50 50 213.8 228.9 177 1089 B 24 H 2 50 50 215.8 230.9 214.8 229.9 1.77 ~84 DIAT TOP P. barboi Zone 177 1089 B 23 H CC 0 8 213.7 228.75 177 1089 B 24 H CC 23 28 223.4 238.53 123.2 233.64 1.8 ~84 CN LO D. brouweri 177 1089 B 24 H 6 30 30 221.6 236.7 177 1089 B 24 H CC 23 28 223.43 238.53 222.52 237.62 1.95 ~84 MAG BOT C2n (Olduvai) 177 1089 B 25 H 2 65 65 225.45 240.55 177 1089 B 25 H 3 135 135 227.65 242.75 226.55 241.65 1.95 ~84 DIAT TOP T. kolbei/F. matuyama Z. 177 1089 B 24 H CC 23 28 223.4 238.53 177 1089 B 25 H CC 14 19 232.8 247.88 228.1 243.21 2 ~84