Table 5. Stratigraphic position of datums in Hole 1000A.

Datum and bioevent Zone
(base)		 Age
(Ma)		 Core, section, interval (cm) Depth 
(mbsf)
Upper
Lower
      165-1000A- 165-1000A-  
B Emiliania huxleyi CN15 0.25 1H-CC 2H-1, 50 3.55
T Pseudoemiliania lacunosa CN14b 0.41 3H-1, 50 3H-2, 50 14.05
T Reticulofenestra asanoi   0.85 4H-2, 50 4H-3, 50 25.05
B Gephyrocapsa parallela CN14a 0.95 4H-3, 50 4H-4, 50 26.55
B Reticulofenestra asanoi   1.16 4H-4, 50 4H-5, 50 28.05
T Gephyrocapsa spp. (large)   1.21 4H-CC 5H-1, 50 32.05
T Helicosphaera sellii   1.27 5H-3, 50 5H-4, 50 36.05
B Gephyrocapsa spp. (large)   1.45 5H-6, 50 5H-6, 130 40.20
B Gephyrocapsa oceanica   1.65 5H-6, 130 5H-CC 40.95
T Calcidiscus macintyrei   1.65 5H-6, 130 5H-CC 40.95
B Gephyrocapsa caribbeanica CN13b 1.73 6H-2, 50 6H-3, 50 44.05
T Discoaster brouweri CN13a 1.97 7H-1, 50 7H-2, 50 52.05
T Discoaster pentaradiatus CN12d 2.38 8H-1, 50 8H-2, 50 61.55
T Discoaster surculus CN12c 2.54 8H-5, 50 8H-6, 50 67.55
T Discoaster tamalis CN12b 2.74 9H-5, 50 9H-6, 50 77.05
T Reticulofenestra ampla   2.78 9H-6, 50 9H-7, 50 78.55
T Reticulofenestra minutula (circ. form)   3.36 11H-2, 50 11H-3, 50 91.55
T Sphenolithus spp.   3.65 13H-1, 60 13H-2, 60 109.15
T Reticulofenestra pseudoumbilicus CN12a 3.80 14H-2, 50 14H-3, 50 120.05
T Amaurolithus primus CN11a 4.37 17H-2, 50 17H-3, 50 148.55
B Ceratolithus rugosus CN10c 5.04 17H-4, 50 17H-5, 50 151.55
T Ceratolithus acutus CN10c 5.04 17H-5, 50 17H-6, 50 153.05
B Ceratolithus acutus CNl0b 5.34 19H-1, 50 19H-2, 50 166.05
T Discoaster quinqueramus CNl0a 5.56 21H-1, 50 21H-2, 50 185.05
T Amaurolithus amplificus   5.88 23H-CC 24H-1, 50 212.55
B Amaurolithus amplificus   6.50 25H-7, 50 25X-CC 231.30
T paracme Reticulofenestra pseudoumbilicus   6.80 26H-1, 50 26H-2, 50 232.55
B Amaurolithus spp. CN9b 7.24 27H-CC 28H-1, 50 250.55
B Discoaster berggrenii CN9a 8.35 31H-5, 50 31H-6, 50 286.05
B paracme Reticulofenestra pseudoumbilicus   8.85 35X-1, 51 35X-2, 49 314.15
T Discoaster hamatus CN8a 9.36 36X-6, 50 36X-CC 331.30
T Catinaster calyculus   9.36 39X-1, 50 39X-2, 50 352.55
B Discoaster hamatus CN7a 10.39 40X-6, 50 40X-CC 369.70
B Catinaster calyculus CN7b 10.70 40X-CC 41X-1, 50 370.75
T Coccolithus miopelagicus   10.39 41X-1, 50 41X-2, 50 371.75
B Catinaster coalitus CN6 10.71 41X-5, 50 41X-6, 50 377.25
T Discoaster kugleri   11.50 44X-3, 50 44X-4, 50 403.65
B common Discoaster kugleri   11.74 46X-CC 47X-1, 50 428.55
T Coronocyclus nitescens   12.12 51X-5, 50 51X-6, 50 473.95
T Cyclicargolithus floridanus   13.19 54X-2, 50 54X-3, 50 498.35
T Sphenolithus heteromorphus CN5a 13.57 55X-6, 50 55X-CC 514.00
T Helicosphaera ampliaperta CN4 15.83 Below base of section  

Note: See Table 2 for definitions and reference descriptions.