Table T5. Stratigraphic positions of selected calcareous nannofossil datums, Site 1263.
Datum
Top of sample interval
Base of sample interval
Average (mcd)
Age (Ma)
Core, section, interval (cm)
Depth
Core, section, interval (cm)
Depth
Youngest
Oldest
(mbsf)
(mcd)
(mbsf)
(mcd)




208-1263A-

208-1263A-


T Discoaster pentaradiatus 2.52 2.52 1H-CC 2.29 2.29 2H-CC 11.66 12.07 7.18
T Discoaster surculus 2.63 2.63 1H-CC 2.29 2.29 2H-CC 11.66 12.07 7.18
T Amaurolithus spp. 4.56 4.56 2H-CC 11.66 12.07 3H-CC 21.17 23.29 17.68

CN9a/NN11 assemblage 7.39 8.28 4H-1, 120 22.50 26.33 4H-2, 50 23.30 27.13 26.73
B Sphenolithus ciperoensis 27.55 27.55 6H-1, 45 40.75 48.00 6H-1, 145 41.75 49.00 48.50
B Sphenolithus distentus 30.32 30.32 6H-CC 49.10 56.35 7H-CC 59.61 68.72 62.54
T Sphenolithus pseudoradians

6H-CC 49.10 56.35 7H-CC 59.61 68.72 62.54
T Reticulofenestra umbilicus >14 µm 31.7 31.7 8H-4, 140 65.20 75.91 8H-5, 45 65.75 76.46 76.19
T Isthmolithus recurvus 32.7 32.7 9H-4, 45 73.75 85.52 9H-4, 140 74.70 86.47 86.00
T Ericsonia formosa 32.9 32.9 9H-4, 45 73.75 85.52 9H-4, 140 74.70 86.47 86.00
B Ericsonia obruta increase 33.7 33.7 10H-3, 140 82.70 94.49 10H-4, 45 83.25 95.04 94.77
T Discoaster saipanensis 34.0 34.0 11H-2, 140 90.70 103.87 11H-3, 36 91.16 104.33 104.10
B Isthmolithus recurvus 36.6 36.6 12H-4, 140 102.57 116.30 12H-5, 45 103.12 116.85 116.58
B Dictyococcites bisectus 38.5 38.5 14H-1, 140 117.70 135.45 14H-2, 60 118.40 136.15 135.80
B Dictyococcites scrippsae 40.3 40.3 14H-5, 10 120.99 138.74 14H-CC 124.05 141.80 140.27
T Nannotetrina spp. 42.3 42.3 15H-CC 135.23 155.75 16H-1, 45 135.75 157.64 156.70
B Reticulofenestra umbilicus >14 µm 42.5 42.5 16H-2, 45 137.25 159.14 16H-2, 140 138.20 160.09 159.62
B Nannotetrina spp. 47.8 47.8 21H-1, 40 183.20 213.54 21H-1, 140 184.20 214.54 214.04
T Discoaster lodoensis 48.0 48.0 21H-2, 40 184.70 215.04 21H-2, 140 185.70 216.04 215.54
B Rhabdosphaera inflata 48.5 48.5 21H-7, 55 192.35 222.69 21H-CC 192.40 222.74 222.72
B Discoaster sublodoensis 49.3 49.3 22H-3, 130 196.34 228.68 22H-4, 40 196.94 229.28 228.98
T Tribrachiatus orthostylus 51.0 51.0 24H-3, 140 212.50 247.15 24H-4, 45 213.05 247.70 247.43
B Discoaster lodoensis 52.4 52.4 27H-3, 45 235.55 275.58 27H-3, 140 236.50 276.53 276.06
B Toweius crassus 51.5 51.5 27H-7, 60 241.20 281.23 28H-1, 80 242.40 284.92 283.08
T Discoaster multiradiatus 53.0 53.0 28H-2, 80 243.90 286.42 28H-3, 80 245.40 287.92 287.17
B Sphenolithus radians 53.3 53.3 28H-3, 80 245.40 287.92 28H-4, 80 246.90 289.42 288.67
B Tribrachiatus orthostylus 53.4 53.4 29H-1, 50 251.60 295.30 29H-1, 140 252.50 296.20 295.75
T Fasciculithus spp.

32H-2, 60 273.70 322.08 32H-4, 60 276.70 325.08 323.58
B Discoaster diastypus 53.9 53.9 32H-6, 130 280.40 328.78 32H-CC 281.61 329.99 329.39

Increase Zygrhablithus bijugatus

33H-2, 110 283.70 334.70 33H-2, 126 283.86 334.86 334.78
B Rhomboaster spp.

34X-1, 10 284.20 335.44 34X-1, 30 284.40 335.64 335.54
B Discoaster multiradiatus 56.2 56.2 36X-3, 40 303.40 357.50 36X-3, 115 304.15 358.25 357.88
B Discoaster nobilis 56.5 56.5 37X-3, 86 310.96 366.34 37X-4, 70 311.80 367.18 366.76
B Heliolithus riedelii 57.3 57.3 39X-2, 140 329.30 388.15 39X-3, 40 329.80 388.65 388.40
B Discoaster mohleri 57.5 57.5 39X-3, 140 330.80 389.65 39X-4, 70 331.60 390.45 390.05
B Heliolithus kleinpellii 58.2 58.2 40X-3, 65 339.65 400.23 40X-CC 340.07 400.65 400.44
B Sphenolithus anarrhopus 58.4 58.4 40X-3, 65 339.65 400.23 40X-CC 340.07 400.65 400.44




208-1263B-

208-1263B-


B Sphenolithus distentus 30.4 30.4 1H-CC 55.40 62.71 2H-1, 5 55.55 64.96 63.84
T Sphenolithus pseudoradians

2H-5, 40 61.90 71.31 2H-5, 140 62.90 72.31 71.81
T Reticulofenestra umbilicus >14 µm 42.5 42.5 3H-CC 74.43 85.47 4H-CC 84.04 96.13 90.80
T Ericsonia formosa 32.9 32.9 3H-CC 74.43 85.47 4H-CC 84.04 96.13 90.80
T Discoaster saipanensis 34.0 34.0 5H-4, 66 88.99 103.68 5H-5, 40 90.23 104.92 104.30
T Chiasmolithus grandis 37.1 37.1 7H-3, 60 106.60 123.58 7H-4, 40 107.90 124.88 124.23
B Dictyococcites bisectus 38.5 38.5 8H-1, 40 112.90 131.24 8H-1, 120 113.70 132.04 131.64
T Nannotetrina spp. 42.3 42.3 9H-CC 131.77 151.72 10H-CC 141.04 161.82 156.77
B Reticulofenestra umbilicus >14 µm 42.5 42.5 11H-CC 150.76 172.54 12H-CC 160.46 183.14 177.84
T Nannotetrina fulgens 43.4 43.4 11H-3, 80 144.80 166.58 11H-4, 80 146.30 168.08 167.33
T Chiasmolithus gigas 44.0 44.0 12H-1, 40 150.90 173.58 12H-1, 140 151.90 174.58 174.08
B Chiasmolithus gigas 46.1 46.1 13H-3, 120 164.21 188.77 13H-4, 40 164.90 189.47 189.12
B Nannotetrina fulgens 47.0 47.0 14H-3, 40 172.90 199.02 14H-3, 120 173.70 199.82 199.42
B Discoaster sublodoensis 49.3 49.3 13H-CC 169.52 194.09 14H-CC 178.52 204.64 199.37
T Discoaster lodoensis 48.0 48.0 14H-CC 178.52 204.64 15H-CC 186.79 214.14 209.39
T Tribrachiatus orthostylus 51.0 51.0 19H-CC 204.84 237.44 20H-CC 214.74 248.45 242.95
B Discoaster lodoensis 52.4 52.4 22H-CC 233.74 272.07 23H-CC 243.32 283.79 277.93
T Discoaster multiradiatus 53.0 53.0 23H-CC 243.32 283.79 24H-CC 252.62 294.91 289.35
B Sphenolithus radians 53.3 53.3 23H-CC 243.32 283.79 24H-CC 252.62 294.91 289.35
B Tribrachiatus orthostylus 53.4 53.4 23H-CC 243.32 283.79 24H-CC 252.62 294.91 289.35
T Fasciculithus spp.

26X-CC 271.50 315.62 27X-CC 280.55 327.93 321.78
B Rhomboaster spp.

28X-CC 284.26 335.09 29X-1, 1 290.30 342.86 338.98
B Discoaster multiradiatus 56.2 56.2 30X-CC 301.78 356.08 31X-CC 315.03 371.06 363.57
B Heliolithus riedelii 57.3 57.3 31X-CC 315.03 371.06 32X-CC 326.11 383.87 377.47
B Discoaster mohleri 57.5 57.5 31X-CC 315.03 371.06 32X-CC 326.11 383.87 377.47
B Heliolithus kleinpellii 58.2 58.2 32X-CC 326.11 383.87 33X-CC 336.98 396.49 390.18




208-1263C-

208-1263C-


T Discoaster lodoensis 48.0 48.0 3H-CC 118.54 136.80 4H-CC 202.26 234.58 185.69
T Tribrachiatus orthostylus 51.0 51.0 5H-CC 206.62 239.62 6H-CC 221.66 255.49 247.56
B Discoaster lodoensis 52.4 52.4 8H-CC 234.95 271.89 9H-CC 244.81 284.60 278.25
T Discoaster multiradiatus 53.0 53.0 9H-CC 244.81 284.60 10H-CC 254.35 296.23 290.42
B Sphenolithus radians 53.3 53.3 9H-CC 244.81 284.60 10H-CC 254.35 296.23 290.42
B Tribrachiatus orthostylus 53.4 53.4 10H-CC 254.35 296.23 11H-CC 263.87 307.58 301.91
T Fasciculithus spp.

12H-CC 272.81 318.23 13H-CC 282.93 330.14 324.19
B Rhomboaster spp.

14H-2, 92 284.87 335.13 14H-2, 110 285.00 335.31 335.22




208-1263D-

208-1263D-


T Fasciculithus spp.

1H-CC 275.20 321.68 2H-CC 282.60 330.98 326.33
B Rhomboaster spp.

3H-CC 284.01 334.62 4H-CC 286.49 337.12 335.87

Note: T = top, B = bottom.