Table T6. Average ages of events defined and effectively used in present age-depth graphs, Sites 1085-1087 (Cape Basin sites).
Age (Ma)
Biostratigraphic event
Shipboard defined
Effectively used weighted
Effectively used unweighted
N
N FO Emiliania huxleyi acme
0.09 0.15 0.15 1
N FO Emiliania huxleyi
0.26 0.23 0.23 2
N Gephyrocapsa caribbeanica acme
0.26 0.23 0.23 2
R LO Axoprunum angelinum
0.46 0.48 0.48 1
N LO Pseudoemiliania lacunosa
0.46 0.42 0.42 2
N Small Gephyrocapsa acme
0.60 0.64 0.60 2
N LO Reticulofenestra asanoi
0.83 0.75 0.75 2
N Small Gephyrocapsa acme
0.96 0.93 0.93 1
N LO Helicosphaera sellii
1.25 1.08 1.06 2
N LO Calcidiscus macintyrei
1.67 1.35 1.52 3
N LO Discoaster brouweri
1.95 1.93 1.85 3
D LO Thalassiosira convexa
2.19 2.07 2.07 1
N LO Discoaster surculus
2.55 2.45 2.46 3
R FO Cycladophora davisiana
2.70 2.47 2.47 1
N LO Discoaster tamalis
2.83 2.71 2.72 2
N LO Reticulofenestra pseudoumbilicus
3.82 3.81 3.78 3
N LO Amaurolithus tricorniculatus
4.50 4.41 4.39 3
N FO Discoaster asymmetricus
5.02 4.66 4.77 2
N LO Discoaster quinqueramus
5.54 5.29 5.29 3
N LO Amaurolithus amplificus
5.90 6.05 6.05 3
N FO Amaurolithus amplificus
6.60 6.65 6.61 3
N FO Amaurolithus primus
7.20 7.24 7.24 2
N FO Discoaster quinqueramus
8.60 8.41 8.43 2
N LO Discoaster bollii
9.10 9.05 9.05 1
N LO Discoaster hamatus
9.63 9.67 9.67 1
N FO Discoaster hamatus
10.70 10.70 10.70 1

Notes: N = nannofossil, R = radiolarian, S = silicoflagellate, D = diatom. FO = first occurrence, LO = last occurrence. N = number of samples. Estimated age weighted according to narrowness of age range, and unweighted. Average effective ages of biostratigraphic events are as used in the age models. Weighted = estimated age weighted according to narrowness of age range, unweighted = not so weighted. (Differences between shipboard-assigned age and effectively used age arise from a number of sources such as sampling interval vs. sedimentation rate, intensity of search for presence and absence of a nannofossil, and problems of preservation. Thus, the data do not necessarily reflect real differences in assigned ages of events and their occurrence at the sites occupied. They do give an idea about the consistency of biostratigraphic shipboard assignments in the circumstances of Leg 175.)