Table 3. Stratigraphic position of datums in Hole 998A.

Datum and bioevent Zone
(base) 		Age
(Ma) 		Core, section, interval (cm) Depth
(mbsf)
Upper
Lower
    165-998A- 165-998A-
B Emiliania huxleyi CN15 0.25 1H-4, 20 1H-4, 70 4.95
T Pseudoemiliania lacunosa CN14b 0.41 2H-1, 100 2H-2, 20 10.15
T Reticulofenestra asanoi   0.85 3H-3, 121 3H-4, 18 22.75
B Gephyrocapsa parallela CN14a 0.95 3H-5, 120 3H-6, 20 25.75
B Reticulofenestra asanoi   1.16 3H-6, 20 3H-6, 70 26.25
T Gephyrocapsa spp. (large)   1.21 3H-CC 4H-1, 83 28.22
T Helicosphaera sellii   1.27 4H-1, 70 4H-1, 100 28.65
B Gephyrocapsa spp. (large)   1.45 4H-2, 20 4H-2, 70 29.75
B Gephyrocapsa oceanica   1.65 4H-4, 120 4H-5, 20 33.75
T Calcidiscus macintyrei   1.65 4H-4, 120 4H-5, 20 33.75
B Gephyrocapsa caribbeanica CN13b 1.73 4H-5, 70 4H-6, 100 35.40
T Discoaster brouweri CN13a 1.97 4H-CC 5H-1, 20 37.40
T Discoaster pentaradiatus CN12d 2.38 5H-5, 100 5H-6, 20 44.65
T Discoaster surculus CN12c 2.54 6H-4, 100 6H-5, 20 52.65
T Discoaster tamalis CN12b 2.74 6H-CC 7H-1, 20 56.40
T Reticulofenestra ampla   2.78 6H-CC 7H-1, 20 56.40
T Reticulofenestra minutula (circ. form)   3.36 8H-1, 20 8H-1, 100 66.40
T Sphenolithus spp.   3.65 8H-1, 100 8H-2, 20 67.15
T Reticulofenestra pseudoumbilicus CN12a 3.80 8H-7, 60 8H-CC 75.30
B acme Discoaster asymmetricus CN11b 10H-1, 20 10H-2, 19 85.75
T Amaurolithus tricorniculatus CN11a 4.37 10H-4, 100 10H-5, 20 90.65
B Ceratolithus rugosus CN10c 5.04 11H-2, 20 11H-2, 100 96.40
T Ceratolithus acutus CN10c 5.04 11H-3, 20 11H-4, 20 98.25
B Ceratolithus acutus CN10b 5.34 11H-4, 100 11H-5, 20 100.15
T Triquetrorhabdulus rugosus CN10b 5.34 11H-5, 20 11H-6, 20 101.25
T Discoaster quinqueramus CN10a 5.56 11H-CC 12H-1, 19 103.90
T Amaurolithus amplificus   5.88 12H-1, 100 12H-2, 20 105.15
T paracme Reticulofenestra pseudoumbilicus   6.80 12H-CC 13H-1, 20 113.40
B Amaurolithus amplificus   6.50 13H-1, 20 13H-1, 100 113.90
B Amaurolithus spp. CN9b 7.24 13H-3, 10 13H-3, 100 116.85
T Minylitha convallis   7.80 14H-3, 20 14H-3, 100 126.40
B Discoaster berggrenii CN9a 8.35 14H-3, 20 14H-3, 100 126.40
B paracme Reticulofenestra pseudoumbilicus   8.85 14H-6, 23 14H-6, 100 130.92
B Discoaster loeblichii CN8b 8.43 14H-6, 23 14H-6, 100 130.92
T Discoaster hamatus CN8a 9.36 15H-3, 100 15H-4, 20 136.65
B Minylitha convallis   9.43 15H-5, 20 15H-6, 20 139.25
T Catinaster calyculus   9.36 15H-5, 20 15H-6, 20 139.25
B Catinaster calyculus CN7b 10.70 16H-5, 20 16H-5, 100 148.40
B Discoaster hamatus CN7a 10.39 16H-5, 100 16H-6, 20 149.15
T Coccolithus miopelagicus   10.39 16H-CC 17H-1, 20 151.40
B Catinaster coalitus CN6 10.71 16H-CC 17H-1, 20 151.40
T Discoaster kugleri   11.50 17H-2, 20 17H-2, 100 153.40
B common Discoaster kugleri   11.74 17H-5, 20 17H-5, 100 157.90
T Coronocyclus nitescens   12.12 18H-1, 20 18H-2, 20 161.75
T Cyclicargolithus floridanus   13.19 19X-4, 20 19X-4, 100 171.30
T Sphenolithus heteromorphus CN5a 13.57 19X-5, 20 19X-5, 80 172.70
T Helicosphaera ampliaperta CN4 15.83 21X-CC 22X-1, 67 195.44
T acme Discoaster deflandrei   16.21 22X-4, 20 22X-5, 20 200.55
B Sphenolithus heteromorphus CN3 18.10 26X-CC 27X-1, 100 242.56
T Sphenolithus belemnos   18.40 27X-1, 100 27X-2, 100 244.95
B Sphenolithus belemnos CN2 19.70 28X-3, 100 28X-4, 100 257.65
T Triquetrorhabdulus carinatus   18.95 28X-3, 100 28X-4, 100 257.65
T Sphenolithus delphix   23.80 35X-CC 36X-1, 100 330.01
T Reticulofenestra bisecta CN1a 23.90 36X-2, 100 36X-3, 100 333.05

Note: See Table 2 for definitions and reference descriptions.