Table 2. Microfossil datums at Hole 1085A.
Fossil
group
Event
Age
(Ma)
Zone (Base)
Core, section, interval (cm)
Depth (mbsf)
A
B
Top
Bottom
Top
Bottom
Mean





175-1085A- 175-1085A-


N FO Emiliania huxleyi acme 0.09 NN21b
1H-CC 2H-2, 90 3.59 6.10 4.85
N FO Emiliania huxleyi 0.26 NN21a CN15 2H2, 90 2H-4, 90 6.10 9.10 7.60
N LO Gephyrocapsa caribbeanica acme 0.26 NN21a CN16 2H2, 90 2H-4, 90 6.10 9.10 7.60
N LO Pseudoemiliania lacunosa 0.46 NN20 CN14b 2H-CC 3H-2, 140 13.62 16.10 14.86
R LO Axoprunum angelinum 0.46

2H-CC 3H-CC 13.62 23.19 18.41
N LO Small Gephyrocapsa acme (Weaver, 1993) 0.6

4H-CC 5H-2, 140 31.56 35.10 33.33
N LO Reticulofenestra asanoi 0.83

5H-4, 140 5H-CC 38.10 42.17 40.14
N LO Small Gephyrocapsa acme (Gartner, 1977) 0.96

5H-CC 6H-CC 42.17 48.96 45.57
N LO Helicosphaera sellii 1.25

7H-2, 130 7H-5, 10 54.00 57.30 55.65
N LO Calcidiscus macintyrei 1.67

8H-CC 9H-2, 140 68.37 73.10 70.74
N LO Discoaster brouweri 1.95 NN19 CN13a 10H-CC 11H-3, 10 89.67 92.30 90.99
D LO Thalassiosira convexa 2.19

10H-CC 11H-CC 89.67 98.69 94.18
N LO Discoaster surculus 2.55 NN18-17 CN12d-c 12H-CC 13H-CC 108.49 117.82 113.16
R FO Cycladophora davisiana 2.7

12H-CC 13H-CC 108.49 117.82 113.16
N LO Discoaster tamalis 2.83

13H-CC 14H-CC 117.82 127.45 122.64
N LO Reticulofenestra pseudoumbilicus 3.82 NN16 CN12a 20H-CC 21H-CC 183.96 193.63 188.80
N LO Amaurolithus tricorniculatus 4.5 NN15 CN11 24H-CC 25H-CC 221.90 230.99 226.45
N FO Discoaster asymmetricus 5.02 NN14 CN10d 26H-CC 27H-CC 241.53 250.87 246.20
N LO Discoaster quinqueramus 5.54 NN13-12 CN12c-a 32H-CC 33H-CC 296.87 304.90 300.89
N LO Amaurolithus amplificus 5.9

35X-CC 36X-CC 324.57 333.90 329.24
N FO Amaurolithus amplificus 6.6

39X-CC 40X-CC 363.27 372.61 367.94
N FO Discoaster quinqueramus 8.6 NN11 CN9a 44X-CC 45X-CC 411.24 420.39 415.82
N LO Discoaster bollii 9.1

46X-CC 47X-CC 430.62 440.56 435.59
N LO Discoaster hamatus 9.63 NN10 CN8 48X-CC 49X-CC 450.25 459.81 455.03
N FO Discoaster hamatus 10.7 NN9 CN7 54X-CC 55X-CC 507.04 517.38 512.21
N LO Discoaster kugleri 11.5

58X-CC 59X-CC 546.36 556.07 551.22
N FO Discoaster kugleri 11.8 NN8-7 CN6-5b 59X-CC 60X-CC 556.07 565.60 560.84
N LO Sphenolithus heteromorphus 13.6 NN6 CN5a 62X-CC 63X-CC 584.97 594.60 589.79

Notes: Fossil group: N = calcareous nannofossils; R = radiolarians; and D = diatoms. FO = first occurrence and LO = last occurrence. Zonal codes refer to the calcareous nannofossil standard zonations of (A) Martini (1971) and (B) Okada and Bukry (1980).