Table 3. Microfossil datums at Hole 1084A.
Fossil
group
|
Event
|
Age
(Ma) |
Zone (base)
|
Core, section, interval (cm)
|
Depth (mbsf)
|
||||
---|---|---|---|---|---|---|---|---|---|
A
|
B
|
Top
|
Bottom
|
Top
|
Bottom
|
Mean
|
|||
|
|
|
|
|
175-1084A- | 175-1084A- |
|
|
|
N | FO Emiliania huxleyi | 0.26 | NN21a | CN15 | 6H-5, 110 | 6H-6, 110 | 47.90 | 49.40 | 48.65 |
N | LO Gephyrocapsa caribbeanica acme | 0.26 | NN21a | CN15 | 6H-5, 110 | 6H-6, 110 | 47.90 | 49.40 | 48.65 |
N | LO Pseudoemiliania lacunosa | 0.46 | NN20 | CN14b | 9H-5, 110 | 9H-CC | 76.50 | 79.35 | 77.93 |
R | LO Axoprunum angelinum | 0.46 |
|
|
8H-CC | 9H-CC | 70.02 | 79.55 | 74.79 |
N | LO Small Gephyrocapsa acme (Weaver, 1993) | 0.60 |
|
|
11H-6, 100 | 11H-CC | 95.67 | 98.69 | 97.18 |
D | LO Nitzschia reinholdii | 0.69 |
|
|
10H-CC | 11H-CC | 89.03 | 98.69 | 93.86 |
S | LO Bachmannocena quadrangula | 0.80 |
|
|
15H-CC | 16H-CC | 136.63 | 143.12 | 139.88 |
N | LO Reticulofenestra asanoi | 0.83 |
|
|
16H-2, 130 | 16H-4, 140 | 138.80 | 141.90 | 140.35 |
N | LO Small Gephyrocapsa acme (Gartner, 1977) | 0.96 |
|
|
21X-CC | 22X-CC | 180.33 | 182.33 | 181.33 |
N | FO Reticulofenestra asanoi | 1.06 |
|
|
24X-5, 40 | 24X-CC | 206.13 | 206.98 | 206.56 |
R | LO Lamprocyrtis neoheteroporos | 1.07 |
|
|
21X-CC | 22X-CC | 180.33 | 182.33 | 181.33 |
N | LO Helicosphaera sellii | 1.25 |
|
|
27X-2, 140 | 27X-4, 140 | 231.52 | 233.81 | 232.67 |
N | LO Calcidiscus macintyrei | 1.67 |
|
|
32X-4, 40 | 32X-CC | 282.14 | 283.18 | 282.66 |
D | LO Proboscia barboi | 1.68 |
|
|
29X-CC | 30X-CC | 254.47 | 265.89 | 260.18 |
R | LO Cycladophora pliocenica | 1.83 |
|
|
32X-CC | 33X-CC | 283.18 | 294.69 | 288.94 |
D | LO Fragilariopsis doliolus | 1.88 |
|
|
30X-CC | 31X-CC | 265.89 | 271.74 | 268.82 |
N | LO Discoaster brouweri | 1.95 | NN19 | CN13a | 34X-CC | 36X-CC | 304.37 | 322.77 | 313.57 |
D | LO Thalassiosira kolbei | 1.96 |
|
|
32X-CC | 33X-CC | 283.18 | 294.69 | 288.94 |
N | LO Discoaster surculus | 2.55 | NN17 | CN12c | 46X-CC | 47X-CC | 422.12 | 429.04 | 425.58 |
R | FO Cycladophora davisiana | 2.70 |
|
|
48X-CC | 49X-CC | 439.49 | 450.97 | 445.23 |
D | FO Rhizosolenia praebergonii | 3.12 |
|
|
51X-CC | 52X-CC | 469.88 | 477.83 | 473.86 |
N | LO Reticulofenestra pseudoumbilicus | 3.82 | NN16 | CN12a | 60X-4, 108 | 60X-4, 114 | 552.88 | 552.94 | 552.91 |
N | LO Amaurolithus tricorniculatus | 4.50 | NN15 | CN11 | 61X-CC | 62X-CC | 564.94 | 576.57 | 570.76 |
Notes: Fossil group: N = calcareous nannofossils, R = radiolarians, D = diatoms, S = silicoflagellates. FO = first occurrence and LO = last occurrence. Zonal codes refer to the standard calcareous nannofossil zonations of (A) Martini (1971) and (B) Okada and Bukry (1980).