Table T10. Distribution of volcanic components in core catcher samples from lithologic Units I, II, and III at Hole 1138A.

Unit/Subunit Lithologies with volcanic components Core, section Depth (mbsf) Feldspar Glass (brown) Pumice Lithics Biotite Tephra layer Age
(Ma)











I
Foraminifer-bearing diatom clay and ooze 1R-CC 8.53
R
R
<0.6
2R-CC 12.78
<0.6

3R-CC 25.57
1.9-0.6

4R-CC 34.94
1.9-0.6

5R-CC 45.58
R
P
1.9-0.6

6R-CC 49.65
R
R
1.9-0.6

7R-CC 62.31
R
R
1.9-0.6

8R-CC 74.04
P
P
R
3.2-2.6

9R-CC 79.21
R
3.8-3.2

10R-CC 87.53
3.8-3.2

11R-CC 102.39
R
A
R
3.8-3.2

12R-CC 107.03
P
P
P
P
T
6.4-5.6











IIA
Foraminifer-bearing nannofossil clay 13R-CC 118.59
TT
6.4-5.6
14R-CC 126.23
A
10.6-8.9

15R-CC 134.23
A
P
T
10.6-8.9

16R-CC 145.85
C
10.6-8.9











IIB
Foraminifer-bearing nannofossil ooze 17R-CC 158.27
R
C
10.6-8.9
18R-CC 168.84
11.7-10.6

19R-CC 174.75
R
T
12.2-11.7

20R-CC 186.14
R
13.5-12.8

21R-CC 191.26
17.0-15.4











IIIA
Foraminifer-bearing nannofossil chalk 30R-CC 278.21
TT
31.0-26.5
31R-CC 285.85
A
31.0-26.5

32R-CC 296.3
A
T
31.0-26.5

33R-CC 305.2
A
T
31.0-26.5

34R-CC 319.09
A
31.0-26.5

35R-CC 330.78
31.0-26.5

36R-CC 340.6
T
35.5-33.0

37R-CC 351.98
43.6-38.0

38R-CC 357.21
43.6-38.0

39R-CC 368.52
43.6-38.0

40R-CC 375
43.6-38.0

41R-CC 383.19
R
R
43.6-38.0

42R-CC 397
43.6-38.0

Notes: Age determined from "Biostratigraphy". Volcanic components in >63 µm fraction of core catcher sample are represented by A = abundant, C = common, P = present, and R = rare. Volcanic components are not abundant in core catcher samples from 183-1138A-22R-CC through 29R-CC and below 42R-CC in Subunit IIIA. Blank = not detected. T = a discrete tephra layer was present in the core from which the core catcher was examined. TT = two tephra layers were present.