Table 4. Stratigraphic position of datums in Hole 999A.
| Datum and bioevent |
Zone (base) |
Age (Ma) |
Core, section, interval (cm) |
Depth (mbsf) |
|
|---|---|---|---|---|---|
Upper
|
Lower
|
||||
| 165-999A- | 165-999A- | ||||
| B Emiliania huxleyi | CN15 | 0.25 | 2H-1, 100 | 2H-1, 122 | 8.71 |
| T Pseudoemiliania lacunosa | CN14b | 0.41 | 2H-7, 30 | 2H-CC | 17.00 |
| T Reticulofenestra asanoi | 0.85 | 4H-4, 22 | 4H-4, 72 | 31.57 | |
| B Gephyrocapsa parallela | CN14a | 0.95 | 4H-6, 100 | 4H-7, 30 | 35.50 |
| B Reticulofenestra asanoi | 1.16 | 5H-1, 72 | 5H-1, 100 | 36.96 | |
| T Gephyrocapsa spp. (large) | 1.21 | 5H-4, 22 | 5H-4, 72 | 41.07 | |
| T Helicosphaera sellii | 1.27 | 5H-7, 30 | 5H-CC | 45.50 | |
| B Gephyrocapsa spp. (large) | 1.45 | 6H-4, 100 | 6H-4, 122 | 51.21 | |
| B Gephyrocapsa oceanica | 1.65 | 7H-1, 22 | 7H-1, 72 | 55.57 | |
| T Calcidiscus macintyrei | 1.65 | 7H-1, 22 | 7H-1, 72 | 55.57 | |
| B Gephyrocapsa caribbeanica | CN13b | 1.73 | 7H-1, 100 | 7H-1, 122 | 56.21 |
| T Discoaster brouweri | CN13a | 1.97 | 7H-CC | 8H-1, 100 | 65.10 |
| T Discoaster pentaradiatus | CN12d | 2.38 | 9H-3, 72 | 9H-3, 122 | 78.07 |
| T Discoaster surculus | CN12c | 2.54 | 10H-1, 122 | 10H-2, 22 | 85.07 |
| T Discoaster tamalis | CN12b | 2.74 | 10H-5, 122 | 10H-6, 21 | 91.07 |
| T Reticulofenestra ampla | 2.78 | 10H-5, 122 | 10H-6, 21 | 91.07 | |
| T Reticulofenestra minutula (circ. form) | 3.36 | 12H-4, 72 | 12H-5, 22 | 108.32 | |
| T Sphenolithus spp. | 3.65 | 13H-1, 122 | 13H-2, 22 | 113.57 | |
| T Reticulofenestra pseudoumbilicus | CN12a | 3.80 | 13H-6, 100 | 13H-7, 30 | 121.00 |
| T Amaurolithus primus | CN11a | 4.37 | 16H-5, 100 | 16H-6, 22 | 147.96 |
| B Ceratolithus rugosus | CN10c | 5.04 | 16H-CC | 17H-1, 100 | 150.60 |
| T Ceratolithus acutus | CN10c | 5.04 | 17H-5, 100 | 17H-6, 22 | 157.46 |
| B Ceratolithus acutus | CNl0b | 5.34 | 18H-1, 100 | 18H-2, 22 | 160.96 |
| T Triquetrorhabdulus rugosus | 5.34 | 18H-2, 100 | 18H-3, 22 | 162.46 | |
| T Discoaster quinqueramus | CNl0a | 5.56 | 18H-6, 100 | 18H-7, 30 | 168.50 |
| T Amaurolithus amplificus | 5.88 | 19H-1, 100 | 19H-2, 22 | 170.46 | |
| B Amaurolithus amplificus | 6.50 | 19H-7, 22 | 19H-CC | 178.46 | |
| B Amaurolithus spp. | CN9b | 7.24 | 22X-2, 22 | 22X-2, 100 | 199.71 |
| T paracme Reticulofenestra pseudoumbilicus | 6.80 | 23X-6, 22 | 23X-7, 22 | 209.07 | |
| T Minylitha convallis | 6.70 | 25X-2, 23 | 25X-3, 21 | 223.90 | |
| B Discoaster berggrenii | CN9a | 8.35 | 26X-2, 22 | 26X-2, 100 | 231.61 |
| B paracme Reticulofenestra pseudoumbilicus | 8.85 | 27X-2, 24 | 27X-3, 24 | 241.59 | |
| B Discoaster loeblichii | CN8b | 8.43 | 27X-5, 22 | 27X-5, 100 | 245.71 |
| B Minylitha convallis | 9.43 | 28X-6, 22 | 28X-7, 22 | 257.17 | |
| T Discoaster hamatus | CN8a | 9.36 | 29X-1, 22 | 29X-1, 100 | 259.01 |
| T Catinaster calyculus | 9.36 | 29X-6, 22 | 29X-7, 22 | 266.87 | |
| B Discoaster hamatus | CN7a | 10.39 | 29X-CC | 30X-1, 22 | 268.11 |
| B Catinaster calyculus | CN7b | 10.70 | 30X-2, 21 | 30X-3, 21 | 270.46 |
| T Coccolithus miopelagicus | 10.39 | 30X-3, 100 | 30X-4, 21 | 272.36 | |
| B Catinaster coalitus | CN6 | 10.71 | 30X-5, 21 | 30X-5, 100 | 274.61 |
| T Discoaster kugleri | 11.50 | 31X-CC | 32X-1, 22 | 287.31 | |
| B common Discoaster kugleri | 11.74 | 33X-6, 100 | 33X-7, 30 | 305.60 | |
| T Coronocyclus nitescens | 12.12 | 35X-2, 24 | 35X-3, 23 | 318.49 | |
| T Cyclicargolithus floridanus | 13.19 | 35X-7, 20 | 35X-CC | 325.40 | |
| T Sphenolithus heteromorphus | CN5a | 13.57 | 37X-5, 100 | 37X-6, 22 | 342.56 |
| T Helicosphaera ampliaperta | CN4 | 15.83 | 39X-7, 30 | 39X-CC | 363.85 |
| T acme Discoaster deflandrei | 16.21 | 42X-5, 100 | 42X-CC | 391.70 | |
| B Sphenolithus heteromorphus | CN3 | 18.10 | 48X-CC | 49X-1, 100 | 451.30 |
| T Sphenolithus belemnos | 18.40 | 49X-3, 100 | 49X-4, 100 | 454.95 | |
| B Sphenolithus belemnos | CN2 | 19.70 | 51X-CC | 52X-1, 100 | 480.10 |
| T Reticulofenestra bisecta | CN1a | 23.90 | Below base of section | ||
Note: See Table 2 for definitions and reference descriptions.