Table 7. Distribution and relative abundances of stratigraphically useful planktonic foraminifers in Pliocene-Quaternary Hole 1020B.
 
Core, section, interval (cm)
Depth (mbsf)
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
Zone
Age
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.