Table 3. Nannofossil datums, absolute ages, and depths at Site 999. Note: T = top of species range (last appearance datum), B = base of species range (first appearance datum). Event Zone (base) Age (Ma) Core, section, interval (cm) Depth (mbsf) Hole 999A: B Emiliania huxleyi CN15 0.248 2H-1, 100 to 2H-2, 100 9.35 T Pseudoemiliania lacunosa CN14b 0.408 2H-7, 30 to 2H-CC 17.20 T Reticulofenestra asanoi 0.88 4H-3, 100 to 4H-4, 100 31.35 B Gephyrocapsa parallela CN14a 0.94 4H-6, 100 to 4H-7, 30 35.50 B Reticulofenestra asanoi 1.17 4H-CC to 5H-1, 100 36.70 T Large Gephyrocapsa spp. 1.23 5H-3, 100 to 5H-4, 100 40.85 T Helicosphaera sellii 1.26 5H-7, 30 to 5H-CC 45.55 B Large Gephyrocapsa spp. 1.48 6H-4, 100 to 6H-5, 100 51.85 B Gephyrocapsa oceanica 1.64 6H-CC to 7H-1, 100 55.65 T Calcidiscus macintyrei 1.64 6H-CC to 7H-1, 100 55.65 B Gephyrocapsa caribbeanica CN13b 1.71 7H-1, 100 to 7H-2, 100 56.85 T Discoaster brouweri CN13a 1.95 7H-CC to 8H-1, 100 65.20 T Discoaster pentaradiatus CN12d 2.36 9H-4, 100 to 9H-5, 100 81.85 T Discoaster surculus CN12c 2.51 10H-1, 100 to 10H-2, 100 85.35 T Discoaster tamalis CN12b 2.82 11H-1, 100 to 11H-2, 100 94.85 T Sphenolithus spp. 3.62 13H-1, 100 to 13H-2, 100 113.85 T R. pseudoumbilicus CN12a 3.83 13H-6, 100 to 13H-7, 30 121.00 T Amaurolithus spp. CN11 4.50 16H-6, 100 to 16H-7, 10 149.40 B Ceratolithus rugosus CN10c 5.046 16H-CC to 17H-1, 100 150.80 T Ceratolithus acutus 5.046 17H-5, 100 to 17H-6, 100 157.85 B Ceratolithus acutus CN10b 5.089 18H-2, 100 to 18H-3, 100 162.85 T Discoaster quinqueramus CN10a 5.537 18H-6, 100 to 18H-7, 30 168.53 B Amaurolithus spp. CN9b 7.392 22X-1, 100 to 22X-2, 100 199.85 B Discoaster berggrenii CN9a 8.281 26X-3, 100 to 26X-4, 100 234.25 T Discoaster hamatus CN8a 9.635 28X-3, 100 to 28X-4, 100 253.45 B Discoaster hamatus CN7 10.476 29X-CC to 30X-1, 100 268.64 B Catinaster coalitus CN6 10.794 30X-4, 100 to 30X-5, 100 274.25 T Cyclicargolithus floridanus 13.23 35X-7, 20 to 35X-CC 325.40 T Sphenolithus heteromorphus CN5a 13.523 37X-5, 100 to 37X-6, 100 342.95 T Helicosphaera ampliaperta CN4 15.6 39X-7, 30 to 39X-CC 363.97 B Sphenolithus heteromorphus CN3 18.2 48X-CC to 49X-1, 100 451.30 T Sphenolithus belemnos 18.3 49X-3, 100 to 49X-4, 30 454.95 B Sphenolithus belemnos CN2 19.2 51X-CC to 52X-1, 100 480.10 T Dictyococcites bisectus CN1c 23.9 Below base of section Hole 999B: T Dictyococcites bisectus CN1c 23.9 10R-CC to 11R-1, 92 617.08 T Sphenolithus ciperoensis CN1a 25.5 11R-1, 92 to 11R-2, 122 622.26 T Sphenolithus distentus CP19b 27.5 14R-4, 106 to 14R-5, 25 654.42 B Sphenolithus ciperoensis CP19a 29.9 18R-CC to 19R-1, 21 680.26 B Sphenolithus distentus CP18 31.5 21R-CC to 22R-1, 15 697.37 T Reticulofenestra umbilicus CP17 32.3 23R-4, 18 to 23R-5, 85 712.97 T Ericsonia formosa CP16c 32.8 23R-CC to 24R-1, 39 716.36 T Discoaster saipanensis CP16a 34.2 25R-4, 100 to 25R-5, 46 731.18 T Discoaster barbadiensis CP16a 34.3 25R-5, 100 to 25R-6, 53 732.71 T Chiasmolithus grandis CP15 37.1 29R-5, 59 to 29R-CC 773.1 B Reticulofenestra bisecta 38.0 31R-3, 11 to 31R-4, 18 788.54 T Chiasmolithus solitus CP14b 40.4 30R-CC to 31R-1, 130 783.91 B Reticulofenestra umbilicus CP14a 43.7 35R-3, 36 to 35R-CC 828.24 T Chiasmolithus gigas CP13c 44.5 36R-4, 10 to 36R-CC 838.52 B Chiasmolithus gigas CP13b 46.1 39R-1, 140 to 39R-2, 68 864.39 B Discoaster sublodoensis CP12 49.7 45R-5, 18 to 45R-CC 918.44 B Discoaster lodoensis CP10 52.0 48R-CC to 49R-1, 130 949.89 T Fasciculithus tympaniformis 55.3 51R-2, 119 to 51R-3, 118 971.84 B Discoaster multiradiatus CP8 56.2 54R-2, 112 to 54R-3, 119 1000.81 B Discoaster mohleri CP6 57.5 54R-4, 17 to 54R-4, 125 1002.61 B Heliolithus kleinpellii CP5 58.4 55R-1, 110 to 55R-2, 126 1009.03 B Fasciculithus tympaniformis CP4 59.7 56R-CC to 57R-1, 26 1026.53 B Fasciculithus spp. 59.9 57R-2, 102 to 57R-3, 60 1029.36 B Sphenolithus primus 60.6 57R-2, 102 to 57R-3, 60 1029.36 B Chiasmolithus danicus CP2 63.8 58R-CC to 59R-1, 110 1044.70 T Cretaceous spp. CP1a 65.0 59R-CC to 60R-1, 10 1049.81 B Micula murus 66.2 Below base of section