Table T12. Distribution of diatoms, Hole 1238A.
Core, section, interval (cm)
Depth (mbsf)
Depth (mcd)
Identification
Method
Abundance
Preservation
Actinocyclus ellipticus
Actinocyclus ellipticus v. lanceolata
Actinocyclus spp.
Actinoptychus senarius
Asteromphalus elegans
Asteromphalus spp.
Azpeitia nodulifer
Chaetoceros spp. (resting spores)
Coscinodiscus spp.
Diploneis bombus
Hemidiscus cuneiformis
Nitzschia cylindrica
Nitzschia marina
Nitzschia miocenica
Nitzschia porteri
Nitzschia reinholdii
Nitzschia fossilis
Nitzschia jouseae
Paralia sulcata
Pseudoeunotia doliolus
Rhizosolenia spp.
Rhizosolenia matuyama
Rhizosolenia praebergonii robusta
Rhizosolenia praebergonii
Rossiela praepaleacea
Stephanopyxis spp.
Thalassionema nitzschioides
Thalassiosira spp.
Thalassiosira burckliana
Thalassiosira convexa
Thalassiosira convexa aspinosa
Thalassiosira miocenica
Thalassiosira oestrupii
Thalassiosira praeconvexa
Thalassiothrix
Remarks
202-1238A-









































Mudline 0.00 0.00 PAL S A G


R
F C C

F
F





F F




A F



F
F
1H-3, 75 3.75 3.75 Toothpick S C-A G


F

C-A C

















F-C F-C







1H-4, 40 4.90 4.90 Toothpick S C M


R
R F F R





T-R T-R
R F F




C F-C



F
F
1H-CC, 9 5.01 5.01 PAL S A M




F C C R
F
F


T

C F




C C



C


2H-CC, 23 14.96 15.56 PAL S C M


F
R C F



R






F




C C



F


3H-CC, 14 24.01 25.86 PAL S A G


F
F C F










F





A C



C-A

Very fragmented/reworking
4H-CC, 17 33.54 38.84 PAL S A G

R R

C
R










R




A F-C



C
F
5H-7, 40 42.93 47.73 Toothpick S A M-G





F











F F










F


5H-CC, 19 43.44 48.24 PAL S C-A M-G

F

F F-C R R
R








F




F-C F-C



F
F
6H-3, 75 46.77 53.62 Toothpick S C M





R-F








R*

R R




F T



R
F
6H-4, 75 48.28 55.13 Toothpick S F P-M


R

F F T
R
T

T T


R





T



R


6H-4, 100 48.53 55.38 Toothpick S F M


T

F-C








R



F



R R



T
F
6H-4, 120 48.73 55.58 Toothpick S C P-M

T

T F











T T F




R



R-F


6H-5, 5 49.09 55.94 Toothpick S C-A M





F
T










T F


T
T



T
F-C
6H-5, 75 49.79 56.64 Toothpick S C M





R-F F F
R




R

F R F



C






F
6H-6, 5 50.60 57.45 Toothpick S C P-M


R
R F
R-F









F R-F F
T


R-F





F
6H-CC, 32 52.93 59.78 PAL S C-A M





F F



F

T


T F





R



F
F
7H-4, 75 57.77 65.07 Toothpick S C M






F



R

R



F





R







7H-5, 75 59.28 66.58 Toothpick S A M-G



T R F


R-F
T


F

R





F




R
F
7H-6, 75 60.79 68.09 Toothpick S F P-M





R-F R-F







R


T




R-F




F
F
7H-CC, 0 61.65 68.95 PAL S F-C M


F

F F
R R






R F F F F


F




F
F
8H-1, 75 62.75 70.75 Toothpick S C M
T F

T F R

F




F


F



F
T



R


8H-3, 75 65.77 73.77 Toothpick S A G

T F
R C C



T





F R
T

R F C



F
R
8H-5, 75 68.79 76.79 Toothpick S C M R

F

F
R
F
F

R

T F F
F

F
F



F


8H-CC, 33 72.04 80.04 PAL S A M


F

F-C

R F
F

C



R



F F F



F
F
9H-1, 75 72.25 78.65 Toothpick S C M


R

C F

R

T
F-C


F F
R

R F F



C
F-C
9H-2, 75 73.76 80.16 Toothpick S A M




R C-A


F



F


F F



F F




F
F
9H-3, 75 75.27 81.67 Toothpick S C M





F F F F

F

F

F F F

T
F C F



F
C
9H-4, 75 76.79 83.19 Toothpick S C-A M


F

C F

F



F


F F

F
F F




F


9H-5, 75 78.30 84.70 Toothpick S C P-M





F F

F



F F

F F

F
F F F



F
F-C
9H-6, 75 79.81 86.21 Toothpick S C-A P-M

R R R R F R R
F
R


R

F R

F
C-A F F-C
F

F


9H-7, 40 80.97 87.37 Toothpick S C M

R


C C R
F
F


R

F R

F
F F-C F

T
F


9H-CC, 20 81.49 87.89 PAL S VA G

F F
R C R R
F
F

R


F F

F
R C F



F-C


10H-3, 75 84.77 91.92 Toothpick S C M

R C
R F F

F








F

F
R F




R
C
10H-CC, 33 91.05 98.20 PAL S A M


F

C-A F

R-F
F-C


F

T T




C-A R





C-A
11H-3, 75 94.26 102.66 Toothpick S C-A M

R F

C F R
F
R

R R


R

F

F F



R
F
11H-6, 75 98.78 107.18 Toothpick S A G





F C-A

F



R F

R R

R

C-A C





F
11H-CC, 10 100.28 108.68 PAL S A G

R R

R-F R

F
R


F-C

F R
R


F




R
F
12H-1, 75 100.75 109.60 Toothpick S VA M

R F

F C

F




F








C F-C



F
F
12H-2, 75 102.26 111.11 Toothpick S VA M


F

C C R
F



F F





F
R C F



F


12H-3, 75 103.77 112.62 Toothpick S C M





C C

F




F

R R

F

F F
F R
F
F
12H-5, 75 106.79 115.64 Toothpick S C-A M





F F-C

F



F F





F

F F
C R
F


12H-CC, 28 110.01 118.86 PAL S C M-G


F T T F T



T


F


T
R

T R-F

T

T
R-F
13H-CC, 17 118.59 129.34 PAL S C M

T F

R F

F




F

T R
R-F R-F
F R-F

R



R
14H-2, 75 121.26 133.21 Toothpick S A M

F F F F F


F



F F T T



F
F A C
F



F
14H-3, 75 122.77 134.72 Toothpick S C M

F F
R F C

F



F F


R

F

C R
R R
F


14H-5, 75 125.78 137.73 Toothpick S C P-M

F F R R F F R
F
F

F F T




R
F C F
F F


F
14H-CC, 19 128.94 140.89 PAL S A M-G
T T T

F R

R-F
R-F


F F



R R
F C

F R




15H-CC, 21 138.40 152.15 PAL S C-A M R R R R

F
R
F
R



F

R
R

R-F


F





16H-CC, 20 148.00 162.10 PAL S C M






C

T
R

R F T



R T
F C

F-C



F
17H-3, 75 151.26 167.11 Toothpick S C-A M

F F

F F T
F
F

F F





F
F C F
R

R T

17H-5, 75 154.26 170.11 Toothpick S C-A M-G R F F

T F


F



F F R

F

F

C F
F



F
17H-7, 40 156.92 172.77 Toothpick S A M
F
F

F
R
F
F

F
F

F

F

C F-C
F R


F Hemialus cf. incisus (Oligocene form)
17H-CC, 25 157.44 173.29 PAL S C M
R
T R
T T R


T


T







F


F R




18H-1, 75 157.75 174.25 Toothpick S VA G






















T-R











18H-2, 75 159.25 175.75 Toothpick S VA G






















T











18H-3, 75 160.76 177.26 Toothpick S VA G



































18H-CC, 25 166.97 183.47 PAL S A G
T F


F


F
R-F


R-F


F





T
F





19H-CC, 27 176.53 194.43 PAL S F-C M
R-F
R

R-F F

R
T T


R

R




F

R



F
20H-3, 75 179.77 197.92 Toothpick S F M




























F F




20H-CC, 22 185.99 204.14 PAL S F-C M


T







R



F

F




R-F

F



F
21H-CC, 28 195.56 214.51 PAL S F M

F
T
F




T


R R






T F T



R
T
22H-5, 75 201.80 222.55 Toothpick S A G




























T F




22H-CC, 24 205.01 225.76 PAL S A M-G

R


C




C


R F

R




A F

R
C
C
23X-CC, 37 211.82 233.52 PAL S C P-M R

R
T C


F
F


F R

R


R
C R



F
F Reworked material. Thalassiosira grunowii
24X-CC, 34 220.82 243.47 PAL S C P-M

F C

C
F
F
F



F

F




F F



F


25X-2, 75 223.11 246.71 Toothpick S F-C M
T T


F F T
T
T


T F

T




F



T T
T
25X-4, 75 226.11 249.71 Toothpick S C M
R F R-F

F T

R
F T

R T

T



T F T





C-A
25X-CC, 31 229.63 253.23 PAL S C M

F F

C


C



F F








C F







26X-3, 75 234.06 258.61 Toothpick S C-A M-G

T T

F-C F








R-F T






F-C


F
T T F
26X-CC, 31 240.07 264.62 PAL S C M
R R F
T F R R
F

T

R


R


T
F R


T

F
27X-3, 75 243.76 269.26 Toothpick S C-A M
T F-C R

F T

F
T


R-F R

T



T F-C T



R
F-C
27X-CC, 24 249.72 275.22 PAL S C M
R C C

F


F
F F





T




F R

R

R F
28X-3, 75 253.37 279.82 Toothpick S C-A M

F-C


F


T
T

T F R







C-A




F
F
28X-CC, 37 258.81 285.26 PAL S C M
R F


F-C
R
F R R F

F








F F





F
29X-3, 75 262.97 290.37 Toothpick S C-A M





F F

F




F R







F


T
T T F
29X-CC, 24 267.03 294.43 PAL S C M
R F


C F


R F R
R R


F


R
C R





C
30X-3, 75 272.67 301.02 Toothpick S C M T T T T

F R-F



T


R


T


T
F-C


R


T
30X-CC, 28 278.71 307.06 PAL S C M
F R


C
R
R
F T





T




C R


T

C
31X-3, 75 282.27 311.57 Toothpick S F-C M

R R-F

F
T
T R-F



T


F




F-C




T
T
31X-CC, 32 288.33 317.63 PAL S C P-M
R
R

C



R F






R




C





R F
32X-3, 75 291.97 322.22 Toothpick S C M





F-C F

R-F R R

T F


T




C T



R
T
32X-CC, 29 298.01 328.26 PAL S C-A P-M

R R

C R

R F F


F








C





T F Thalassiosira grunowii
33X-3, 75 301.67 332.87 Toothpick S C M T R
T

F



R T

R









F-C T

T


F
33X-CC, 31 307.73 338.93 PAL S F P
R



F


R F













F R





R Contamination
34X-3, 75 311.27 343.42 Toothpick S A M

T R

F T

F

T
T F
T
F




C-A R

R T

F-C Thalassiosira grunowii
34X-6, 75 315.80 347.95 Toothpick S C-A M
R



C-A


F
T


R








C

T R


F
35X-1, 75 317.85 350.95 Toothpick S C-A M R R F


F




R F-C

F








F






F Thalassiosira grunowii
35X-3, 75 320.87 353.97 Toothpick S A M F F F T
T F-C




R C-A F
F








F-C



F

C
35X-CC, 25 326.86 359.96 PAL S C-A M

T

T T


T

F

T


T




C


F-C F

A Thalassiosira grunowii
36X-CC, 28 336.47 370.52 PAL S C-A M





F




T F-C











F


F F-C
F

37X-CC, 18 345.99 380.99 PAL S C M


R-F
T F





F





T




F





F

38X-CC, 31 355.56 391.51 PAL S C M
T



R



R T R



















F
39X-1, 75 356.35 393.25 Toothpick S F-C M T R T

T F T T
R-F R T T
T R
T
R



T R-F R




F F-C
39X-2, 75 357.86 394.76 Toothpick S F-C M R R T

T F-C T

R

T T
R






F
F-C






F-C
39X-3, 75 359.37 396.27 Toothpick S C M
R
T
T F



T T T T T







F








F-C
39X-5, 75 362.38 399.28 Toothpick S C P R R




R

R-F T T
T
T


R


T
F T





F-C
39X-CC, 29 365.41 402.31 PAL S C M





T



R-F T


T


F


R T F-C






T
40X-3, 75 368.97 406.82 Toothpick S C-A M
T


T F


F T T


R-F


T


T
F-C






C
40X-5, 75 371.97 409.82 Toothpick S A M
T



F


F R



F
T




T
F-C






F-C
40X-CC, 30 375.00 412.85 PAL S F-C P-M T




R-F


R














C






R-F
41X-2, 75 377.15 415.95 Toothpick S F P T T


T
T T










T




F T-R





F
41X-5, 75 381.67 420.47 Toothpick S F P-M






F

























F Coscinodiscus marginatus
41X-CC, 1 383.37 422.17 PAL S C P-M R








R






















F Coscinodiscus marginatus
43X-1, 75 394.85 435.55 Toothpick S B




































43X-2, 75 396.36 437.06 Toothpick S B




































43X-3, 75 397.36 438.06 Toothpick S B




































43X-CC, 24 397.69 438.39 PAL S B




































44X-1, 75 404.45 446.10 Toothpick S B




































44X-2, 75 405.96 447.61 Toothpick S B




































44X-3, 75 407.47 449.12 Toothpick S B




































44X-4, 75 408.98 450.63 Toothpick S B




































44X-5, 75 410.49 452.09 Toothpick S B




































44X-5, 69 410.43 452.63 Toothpick S B




































44X-CC, 36 413.49 455.14 PAL S B




































45X-1, 75 414.05 456.65 Toothpick S B




































45X-2, 75 415.55 458.15 Toothpick S B




































45X-3, 50 416.80 459.40 Toothpick S B




































45X-CC, 35 417.71 460.31 PAL S B




































46X-1, 75 423.65 467.20 Toothpick S B




































Notes: PAL = paleontology sample. S = smear slide. Abundance: VA = abundant, A = abundant, C = common, F = few, R = rare, T = trace, B = barren. Preservation: G = good, M = moderate, P = poor.