Table 12. Synchroneity/diachroneity of planktonic foraminifer datum levels (Sites 981-984).
| Hole 981A | Hole 982B | Hole 983A | Hole 984B | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Datum level |
Age (Ma) |
Depth (mbsf) | Age (Ma) |
Average age (Ma) | Depth (mbsf) |
Age (Ma) |
Average age (Ma) | Depth (mbsf) | Age (Ma) |
Average age (Ma) | Depth (mbsf) |
Age (Ma) |
Average age (Ma) | |||
S, acme N. pachyderma (s.) |
1.80 |
98.09 |
1.79 |
1.81 |
36.60 |
1.79 |
1.83 |
227.60 |
1.78 |
1.79 |
192.35 |
1.74 |
1.77 |
|||
100.80 |
1.83 |
37.76 |
1.86 |
230.60 |
1.80 |
198.35 |
1.79 |
|||||||||
FO Gr. inflata |
2.09 |
120.82 |
2.13 |
2.13 |
41.10 |
2.06 |
2.09 |
|||||||||
120.99 |
2.13 |
42.54 |
2.13 |
|||||||||||||
LO N. atlantica |
2.41 |
144.19 |
2.21 |
2.22 |
45.54 |
2.26 |
2.30 |
302.15 |
2.57 |
2.57* |
||||||
145.69 |
2.22 |
47.15 |
2.34 |
303.65 |
2.58 |
|||||||||||
LO Gr. puncticulata |
2.41 |
147.19 |
2.22 |
2.23 |
56.18 |
2.78 |
2.81 |
|||||||||
148.69 |
2.23 |
57.68 |
2.85 |
|||||||||||||
LO Gr. cf. crassula |
3.30 |
206.30 |
3.12 |
3.13 |
68.42 |
3.15 |
3.17 |
|||||||||
207.80 |
3.14 |
68.42 |
3.20 |
|||||||||||||
FO Gr. puncticulata |
4.50 |
277.70 |
4.33 |
4.34 |
109.70 |
4.29 |
4.31 |
|||||||||
279.20 |
4.36 |
110.30 |
4.33 |
|||||||||||||
LO N. acostaensis |
5.29 |
160.74 |
5.44 |
5.45 |
||||||||||||
162.24 |
5.47 |
|||||||||||||||
d. to s. N. atlantica |
6.40 |
236.69 |
7.10 |
7.12 |
||||||||||||
238.19 |
7.13 |
|||||||||||||||
FO N. acostaensis |
10.03 |
323.05 |
9.42 |
9.46 |
||||||||||||
326.49 |
9.51 |
|||||||||||||||
LO P. mayeri |
10.30 |
323.05 |
9.42 |
9.46 |
||||||||||||
326.49 |
9.51 |
|||||||||||||||
FO O. suturalis |
15.10 |
498.60 |
14.93 |
14.95 |
||||||||||||
499.70 |
14.98 |
|||||||||||||||
LO C. dissimilis |
17.30 |
540.95 |
16.99 |
17.01 |
||||||||||||
Notes: Ages in the second column are after Berggren et al. (1995). S = start, d. = dextral, s. = sinistral, FO = first occurrence, LO = last occurrence. *N. atlantica datum level in Hole 984B is calculated on extrapolation of sedimentation rate between base of Olduvai Chron and top of Reunion Event. Horizontal black bars indicate zonal, epoch, and subepoch boundaries. Reader is referred to the PDF file for proper formatting.