Table T11. Summary of biostratigraphic age assignments for Holes 1089A, 1089B, 1089C, and 1089D. Notes: MIS = marine isotope stage; RWK = reworking. Leg Site Hole Core Type Section Sample Top Sample bottom Depth Depth Calcareous nannofossil zone Calcareous nannofossil age (Ma) Diatom zone Diatom age (Ma) Radiolaria zone Radiolaria age (Ma) Comment (cm) (cm) (mbsf) (mcd) 177 1089 A 1 H CC 17 22 7.27 7.27 NN21 0-0.26 T. lentiginosa Subz. c 0-0.18 177 1089 A 2 H CC 16 21 16.9 16.9 NN21 0-0.26 T. lentiginosa Subz. c 0-0.18 177 1089 A 3 H CC 13 18 21.18 21.18 NN21 0-0.26 T. lentiginosa Subz. c 0-0.18 177 1089 A 4 H CC 22 27 30.66 30.66 NN21 0-0.26 T. lentiginosa Subz. b 0.18-0.42 Omega/B. aquilonalis 0-0.46 177 1089 A 5 H 2 100 100 38.3 38.3 NN21 0-0.26 177 1089 A 5 H 2 130 130 38.6 38.6 NN21 0-0.26 177 1089 A 5 H CC 14 19 43.36 43.36 NN20 <0.46 dissolved T. lentiginosa Subz. b 0.18-0.42 Omega/B. aquilonalis 0-0.46 177 1089 A 6 H CC 18 23 52.25 52.25 NN20 0.26-0.46 T. lentiginosa Subz. b 0.18-0.42 Omega/B. aquilonalis 0-0.46 177 1089 A 7 H CC 51 56 63.43 63.43 NN20 0.26-0.46 T. lentiginosa Subz. a 0.42-0.65 ? >0.46 177 1089 A 8 H 1 120 120 65.5 65.5 NN19 >0.46 177 1089 A 8 H 3 30 30 70.6 70.6 NN19 >0.46 177 1089 A 8 H CC 9 14 74.03 74.03 NN19 0.46-0.88 T. lentiginosa Subz. a 0.42-0.65 ? >0.46 177 1089 A 9 H CC 10 15 75.24 75.24 NN19 0.46-0.88 T. lentiginosa Subz. a 0.42-0.65 177 1089 A 10 H CC 0 5 92.97 92.97 NN19 0.46-0.88 A. ingens Subz. c 0.65-1.07 177 1089 A 11 H CC 53 58 97.9 97.9 NN19 0.46-0.88 A. ingens Subz. c 0.65-1.07 177 1089 A 12 H 4 120 120 109 109 NN19 <0.88 177 1089 A 12 H 6 30 30 110.1 110.1 NN19 >0.88? 177 1089 A 12 H 7 30 30 111.5 111.5 NN19 >0.88? 177 1089 A 12 H CC 0 5 111.59 111.59 NN19 0.88-0.96 A. ingens Subz. c 0.65-1.07 ? >0.46 177 1089 A 13 H CC 0 5 111.8 111.8 NN19 0.88-0.96 A. ingens Subz. c 0.65-1.07 177 1089 A 14 H CC 11 16 130.07 130.07 NN19 0.88-0.96 A. ingens Subz. c 0.65-1.07 177 1089 A 15 H CC 21 26 136.7 136.7 NN19 0.88-0.96 A. ingens Subz. c 0.65-1.07 177 1089 A 16 H CC 9 14 149.24 149.24 NN19 dissolved A. ingens Subz. b 1.07-1.3 ? >0.46 177 1089 A 18 H 1 30 30 159.6 159.6 NN19 >1.08 177 1089 A 18 H CC 21 26 166.22 166.22 NN19 1.08-1.24 A. ingens Subz. b 1.07-1.3 177 1089 A 19 H 1 120 120 170 178.01 NN19 >1.24 177 1089 A 19 H CC 0 10 177.69 177.69 NN19 1.24-1.46 A. ingens Subz. b 1.07-1.3 177 1089 A 20 H CC 13 23 187.48 187.48 NN19 1.24-1.46 A. ingens Subz. b 1.07-1.3 ? >0.46 177 1089 A 21 H CC 21 26 195.09 195.09 NN19 >1.46 A. ingens Subz. a 1.3-1.8 177 1089 A 23 H 1 30 30 207.1 207.1 NN19 <1.69 177 1089 A 23 H 1 120 120 207.6 207.6 NN19 <1.69 177 1089 A 23 H 3 120 120 209.5 209.5 NN19 <1.69 177 1089 A 23 H 4 120 120 212.5 224.8 NN19 >1069 177 1089 A 23 H CC 31 41 215.29 215.29 ? RWK-Pliocene? A. ingens Subz. a 1.3-1.8 177 1089 B 2 H CC 10 15 13.67 13.67 NN21 0-0.26 T. lentiginosa Subz. c 0-0.18 Omega/B. aquilonalis 0-0.46 177 1089 B 3 H CC 8 16 23.12 23.12 NN21 0-0.26 T. lentiginosa Subz. c 0-0.18 177 1089 B 4 H CC 12 17 32.42 32.42 NN21 0-0.26 T. lentiginosa Subz. b 0.18-0.42 177 1089 B 5 H 3 30 30 36.6 36.6 ? ? 177 1089 B 5 H 3 130 130 37.1 37.1 NN20 >0.26? dissolved 177 1089 B 5 H CC 16 21 41.9 41.9 NN20 0.26-0.46 T. lentiginosa Subz. b 0.18-0.42 177 1089 B 6 H CC 11 16 51.18 51.18 NN20 0.26-0.46 T. lentiginosa Subz. b 0.18-0.42 Omega/B. aquilonalis 0-0.46 177 1089 B 7 H CC 8 14 60.73 60.73 NN20 0.26-0.46 T. lentiginosa Subz. a 0.42-0.65 ? >0.46 177 1089 B 8 H 1 120 120 63 63 NN20 >0.46 reworking 177 1089 B 8 H 2 30 30 63.6 63.6 NN19 >0.46 reworking 177 1089 B 8 H CC 20 25 70.02 70.02 NN19 0.46-0.88 T. lentiginosa Subz. a 0.42-0.65 177 1089 B 9 H CC 15 20 80.24 80.24 NN19 0.46-0.88 T. lentiginosa Subz. a 0.42-0.65 177 1089 B 10 H CC 15 20 88.25 88.25 NN19 0.46-0.88 A. ingens Subz. c 0.65-1.07 ? >0.46 177 1089 B 11 H CC 9 14 99.09 99.09 NN19 0.46-0.88 A. ingens Subz. c 0.65-1.07 177 1089 B 12 H CC 8 13 108.43 108.43 NN19 0.46-0.88? A. ingens Subz. c 0.65-1.07 177 1089 B 13 H 4 30 30 114.4 114.4 NN19 >0.88 177 1089 B 13 H 4 130 130 115.1 115.1 NN19 >0.88 177 1089 B 13 H CC 0 8 117.9 117.9 NN19 0.88-0.96 A. ingens Subz. c 0.65-1.07 177 1089 B 14 H CC 14 19 127.14 127.14 NN19 0.88-0.96 A. ingens Subz. c 0.65-1.07 ? >0.46 177 1089 B 15 H CC 0 5 136.68 136.68 NN19 <0.96 A. ingens Subz. c 0.65-1.07 177 1089 B 16 H 5 130 130 145.1 145.1 NN19 <0.96 177 1089 B 16 H 6 30 30 145.6 145.6 NN19 <0.96 177 1089 B 16 H CC 12 17 146.4 146.4 NN19 <0.96 A. ingens Subz. c 0.65-1.07 177 1089 B 17 H 2 120 120 150 161.26 NN19 0.96-1.08 177 1089 B 17 H 4 120 120 153 153 NN19 <1.08 177 1089 B 17 H 5 30 30 153.6 153.6 NN19 >1.08 177 1089 B 17 H CC 18 23 155.28 155.28 NN19 >1.08 A. ingens Subz. b 1.07-1.3 177 1089 B 18 H CC 13 18 165.39 165.39 NN19 1.08-1.24 A. ingens Subz. b 1.07-1.3 ? >0.46 177 1089 B 19 H 5 120 120 173.5 185.34 NN19 >1.24 177 1089 B 19 H CC 16 21 175.33 175.33 barren A. ingens Subz. b 1.07-1.3 177 1089 B 20 H 6 30 30 183.6 183.6 NN19 <1.46 177 1089 B 20 H CC 0 10 185.15 185.15 barren A. ingens Subz. b 1.07-1.3 177 1089 B 21 H CC 11 16 194.21 194.21 NN19 >1.46? (~barren) A. ingens Subz. a 1.3-1.8 177 1089 B 22 H 2 130 130 197.6 197.6 NN19 >1.46 177 1089 B 22 H CC 0 5 204.3 204.3 NN19 barren early A. ingens Subz. a 1.5-1.8 ? >0.46 177 1089 B 23 H 1 30 30 204.6 204.6 NN19 <1.69 177 1089 B 23 H 2 30 30 206.1 206.1 NN19 >1.69 177 1089 B 23 H CC 0 8 213.65 213.65 barren early A. ingens Subz. a 1.5-1.8 177 1089 B 24 H CC 23 28 223.43 223.43 NN18 >1.95 P. barboi 1.8-2.0 177 1089 B 25 H CC 14 19 232.78 232.78 NN18 >1.95 T. kolbei/F.matuyama 2.0-2.5 177 1089 B 26 H CC 11 16 242.01 242.01 barren T. kolbei/F.matuyama 2.0-2.5 ? >0.46 177 1089 B 27 H CC 45 53 250.79 250.79 barren T. kolbei/F.matuyama 2.0-2.5 177 1089 B 28 H CC 25 30 257.84 257.84 barren ?T. kolbei/F.matuyama 2.0-2.5 no age indicative diatom taxa found 177 1089 B 29 H CC 62 67 264.91 264.91 barren ?T. kolbei/F.matuyama 2.0-2.5 ? close to 2.61 no age indicative diatom taxa found 177 1089 C 1 H CC 8 13 2.38 2.38 NN21 0-0.26 T. lentiginosa Subz. c 0-0.18 177 1089 C 2 H CC 0 8 9.37 9.37 NN21 0-0.26 T. lentiginosa Subz. c 0-0.18 177 1089 C 3 H 1 110 110 15 15 NN21 T. lentiginosa Subz. c 0-0.18 warm-water diatom assemblage MIS 5.1 177 1089 C 3 H CC 9 14 17.42 17.42 NN21 0-0.26 T. lentiginosa Subz. c 0-0.18 Omega/B. aquilonalis 0-0.46 177 1089 C 4 H 1 10 10 23.5 23.5 NN21 T. lentiginosa Subz. c 0-0.18 warm-water diatom assemblage MIS 5.5 177 1089 C 4 H 3 10 10 26.5 26.5 NN21 T. lentiginosa Subz. b 0.18-0.42 cold-water diatom assemblage MIS 6 177 1089 C 4 H 5 90 90 30.3 30.3 NN21 T. lentiginosa Subz. b 0.18-0.42 warm-water diatom assemblage MIS 7 177 1089 C 4 H CC 10 15 31.78 31.78 NN21 <0.26? T. lentiginosa Subz. b 0.18-0.42 177 1089 C 5 H 1 10 10 33 33 ? T. lentiginosa Subz. b 0.18-0.42 warm-water diatom assemblage MIS 7 177 1089 C 5 H 1 90 90 33.8 33.8 T. lentiginosa Subz. b 0.18-0.42 warm-water diatom assemblage MIS 7 177 1089 C 5 H 3 10 10 36 36 T. lentiginosa Subz. b 0.18-0.42 warm-water diatom assemblage MIS 7 177 1089 C 5 H CC 10 15 40.91 40.91 NN20 0.26-0.46 T. lentiginosa Subz. b 0.18-0.42 Omega/B. aquilonalis 0-0.46 177 1089 C 6 H 2 10 10 44 44 NN20 T. lentiginosa Subz. b 0.18-0.42 warm-water diatom assemblage MIS 9 177 1089 C 6 H 3 60 60 46 46 NN20 T. lentiginosa Subz. b 0.18-0.42 warm-water diatom assemblage MIS 9 177 1089 C 6 H 4 10 10 47 47 NN20 T. lentiginosa Subz. b 0.18-0.42 warm-water diatom assemblage MIS 9 177 1089 C 6 H CC 9 14 51.46 51.46 NN20 0.26-0.46 T. lentiginosa Subz. b 0.18-0.42 ? >0.46 177 1089 C 7 H 1 10 10 52 52 NN20 T. lentiginosa Subz. b 0.18-0.42 warm-water diatom assemblage MIS 11 177 1089 C 7 H 2 60 60 54 54 NN20 T. lentiginosa Subz. b 0.18-0.42 warm-water diatom assemblage MIS 11 177 1089 C 7 H 3 110 110 56 56 NN20 T. lentiginosa Subz. b 0.18-0.42 warm-water diatom assemblage MIS 11 177 1089 C 7 H 5 10 10 58 58 NN20 T. lentiginosa Subz. b 0.18-0.42 warm-water diatom assemblage MIS 11 177 1089 C 7 H 6 60 60 60 60 NN20 T. lentiginosa Subz. b 0.18-0.42 warm-water diatom assemblage MIS 11 177 1089 C 7 H CC 0 10 60.81 60.81 NN20 0.26-0.46 T. lentiginosa Subz. a 0.42-0.65 ? >0.46 177 1089 C 8 H CC 0 10 70.34 70.34 NN19 0.46-0.88 T. lentiginosa Subz. a 0.42-0.65 177 1089 C 9 H 5 121 121 78 78 NN19 T. lentiginosa Subz. a 0.42-0.65 warm-water diatom assemblage 177 1089 C 9 H 7 60 60 80 80 NN19 T. lentiginosa Subz. a 0.42-0.65 177 1089 C 9 H CC 7 12 80.1 80.1 NN19 0.46-0.88 T. lentiginosa Subz. a 0.42-0.65 177 1089 C 10 H 2 10 10 82 82 NN19 T. lentiginosa Subz. a 0.42-0.65 cold-water diatom assemblage MIS16 177 1089 C 10 H 3 60 60 84 84 NN19 A. ingens Subz. c 0.65-1.07 cold-water diatom assemblage MIS16 177 1089 C 10 H 4 110 110 86 86 NN19 A. ingens Subz. c 0.65-1.07 warm-water diatom assemblage MIS 17 177 1089 C 10 H CC 5 5 88.04 88.04 NN19 A. ingens Subz. c 0.65-1.07 warm-water diatom assemblage MIS 17 177 1089 C 10 H CC 18 23 88.08 88.08 NN19 0.46-0.88 A. ingens Subz. c 0.65-1.07 177 1089 C 11 H CC 13 18 99.16 99.16 NN19 0.46-0.88 A. ingens Subz. c 0.65-1.07 ? >0.46 177 1089 C 12 H CC 10 15 107.43 107.43 NN19 <0.88 A. ingens Subz. c 0.65-1.07 177 1089 C 13 H CC 0 10 117.42 117.42 NN19 0.88-0.96 A. ingens Subz. c 0.65-1.07 177 1089 C 14 H CC 9 14 126.55 126.55 NN19 0.88-0.96 A. ingens Subz. c 0.65-1.07 177 1089 C 15 H CC 21 26 135.76 135.76 NN19 0.88-0.96 A. ingens Subz. c 0.65-1.07 ? >0.46 177 1089 C 16 H CC 10 15 146.8 146.8 NN19 0.96-1.08 A. ingens Subz. c 0.65-1.07 177 1089 C 17 H CC 11 16 156.33 156.33 NN19 1.08-1.24 A. ingens Subz. b 1.07-1.3 177 1089 C 18 H CC 0 3 165.57 165.57 NN19 1.08-1.24 A. ingens Subz. b 1.07-1.3 177 1089 C 19 H CC 22 27 169.56 169.56 NN19 barren A. ingens Subz. b 1.07-1.3 ? >0.46 177 1089 C 20 H CC 46 51 184.01 184.01 NN19 1.24-1.46 A. ingens Subz. b 1.07-1.3 177 1089 C 21 H CC 19 24 190.84 190.84 NN19 1.24-1.46 A. ingens Subz. b 1.3-1.8 ? >0.46 177 1089 C 20 H CC 46 51 184.01 184.01 NN19 1.24-1.46 A. ingens Subz. b 1.07-1.3 177 1089 C 21 H CC 19 24 190.84 190.84 NN19 1.24-1.46 A. ingens Subz. a 1.3-1.8 ? >0.46 177 1089 D 1 H CC 5 13 6.62 6.62 NN21 0-0.26 T. lentiginosa Subz. c 0-0.18 Omega/B. aquilonalis 0-0.46 177 1089 D 2 H CC 8 13 15.29 15.29 NN21 0-0.26 T. lentiginosa Subz. c 0-0.18 177 1089 D 3 H CC 7 12 22.51 22.51 NN21 0-0.26 T. lentiginosa Subz. c 0-0.18 177 1089 D 4 H CC 0 10 32.56 32.56 barren T. lentiginosa Subz. b 0.18-0.42 177 1089 D 5 H CC 0 5 42.07 42.07 NN20 0.26-046 T. lentiginosa Subz. b 0.18-0.42 Omega/B. aquilonalis 0-0.46 177 1089 D 6 H CC 24 29 51.42 51.42 NN20 0.26-046? T. lentiginosa Subz. b 0.18-0.42 Omega/B. aquilonalis 0-0.46 177 1089 D 7 H CC 0 10 61.06 61.06 NN20 0.26-046? T. lentiginosa Subz. a 0.42-0.65 >0.46 177 1089 D 8 H CC 5 10 70.72 70.72 NN19 0.46-0.88 T. lentiginosa Subz. a 0.42-0.65 177 1089 D 9 H CC 0 10 79.7 79.7 NN19 0.46-0.88 T. lentiginosa Subz. a 0.42-0.65 ? >0.46 177 1089 D 10 H CC 0 5 89.72 89.72 NN19 0.46-0.88 A. ingens Subz. c 0.65-1.07 177 1089 D 11 H CC 0 10 98 98 NN19 0.46-0.88 A. ingens Subz. c 0.65-1.07 177 1089 D 12 H CC 13 18 108.44 108.44 NN19 disolved A. ingens Subz. c 0.65-1.07 177 1089 D 13 H CC 0 5 118.07 118.07 NN19 0.88-0.96 A. ingens Subz. c 0.65-1.07 ? >0.46