Table
7. Distribution and relative abundances of stratigraphically useful
planktonic foraminifers in Pliocene-Quaternary Hole 1020B.
Abundance
Neogloboquadrina
pachyderma pachyderma
Neogloboquadrina
pachyderma B
Neogloboquadrina
pachyderma A
Globorotalia
inflata
Neogloboquadrina
humerosa praehumerosa
Neogloboquadrina
pachyderma C
Neogloboquadrina
kagaensis
Neogloboquadrina
asanoi
Globorotalia
puncticulata
Globorotalia
decoraperta
Globorotalia
ikebei
167-1020B-
1H-2,
120-125
2.70
A
A
CM1
Quaternary
1H-5,
120-125
7.20
A
A
1H-CC
8.00
A
A
2H-2,
120-125
10.50
A
A
2H-5,
120-125
15.00
F
F
F
2H-CC
17.00
A
A
3H-2,
120-125
20.00
A
A
3H-5,
120-125
24.50
C
C
3H-CC
27.00
A
A
A
4H-2,
120-125
29.50
R
R
4H-5,
120-125
34.00
C
C
4H-CC
36.00
A
A
5H-2,
120-125
39.00
B
5H-5,
120-125
43.50
A
A
5H-CC
46.00
A
A
6H-2,
120-125
48.50
A
A
C
6H-5,
120-125
53.00
A
A
6H-CC
55.00
A
A
A
R
7H-2,
120-125
58.00
R
R
7H-5,
120-125
62.50
A
R
A
7H-CC
65.00
R
R
8H-2,
120-125
67.50
A
A
8H-5,
120-125
72.00
F
F
F
CM2
8H-CC
74.00
A
A
A
9H-2,
120-125
77.00
A
A
A
9H-5,
120-125
81.50
A
A
A
9H-CC
84.00
A
A
A
10H-2,
120-125
86.50
A
A
A
A
C
10H-5,
120-125
91.00
A
A
A
R
10H-CC
93.00
A
A
A
11H-CC
102.00
R
R
R
R
12H-2,
120-125
105.50
A
A
A
C
12H-5,
120-125
110.00
C
R
C
R
12H-CC
112.00
R
R
R
CM3
to CM5
13H-2,
120-125
115.00
F
F
13H-5,
120-125
119.50
R
R
13H-CC
122.00
B
14H-2,
120-125
124.50
F
F
F
14H-5,
120-125
129.00
C
C
C
14H-CC
131.00
C
C
C
R
15H-2,
120-125
134.00
F
F
R
R
15H-5,
120-125
138.50
A
A
A
R
R
15H-CC
141.00
F
F
F
R
16H-2,
120-125
143.50
C
C
16H-5,
5-125
146.85
R
R
16H-CC
150.00
A
A
C
F
A
17H-2,
120-125
153.00
R
R
17H-5,
120-125
157.10
R
R
late
Pliocene
17H-CC
160.00
C
C
C
18H-2,
120-125
162.50
B
18H-6,
120-125
168.50
C
C
C
18H-CC
170.00
A
C
C
R
A
19X-2,
118-122
171.98
F
F
F
CM6
19X-5,
120-123
176.50
A
A
A
A
19X-CC
179.00
C
R
F
C
20X-CC
189.00
A
A
C
A
21X-4,
130-133
194.30
A
A
R
A
21X-CC
198.00
A
A
F
A
22X-4,
121-124
203.81
A
A
A
C
F
22X-CC
208.00
R
R
R
23X-4,
117-120
213.37
B
23X-CC
217.00
B
25X-4,
118-122
232.68
A
A
R
A
R
R
25X-CC
237.00
C
C
F
C
C
C
26X-4,
126-130
242.36
A
C
R
F
R
A
26X-CC
246.00
A
C
A
27X-4,
120-125
252.00
F
R
F
CM7
early
Pliocene
27X-CC
256.00
B
28X-4,
120-125
261.60
R
R
28X-CC
265.00
A
A
C
A
F
A
CM8
29X-2,
126-129
268.06
C
29X-CC
275.00
A
A
A
A
30X-1,
112-115
275.82
B
Notes: California margin (CM) zones indicated. A = abundant, C = common, F = few, R = rare, B = barren.