Yanagisawa and Akiba, 1998 (Northwest Pacific)
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Diatom zone
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Author
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Subzone
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Leg 191 boundary age (Ma)
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Yanagisawa and Akiba (1998) boundary age (Ma)*
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Datum boundary
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Depth (mbsf)
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Core, section, interval (cm) |
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191-1179B- | 191-1179C- | |||||||
Neodenticula seminae | Donahue (1970) | 0.32 | 0.3 | LO Proboscia curvirostris† | 14.35 | 2H-4, 75–77; 2H-5, 75–77 | ||
Proboscia curvirostris | Donahue (1970) | 1.21 | 1 | LO Actinocyclus oculatus | 45.8 | 5H-6, 75–77; 5H-7, 70–72 | ||
Actinocyclus oculatus | Donahue (1970) | 1.45 | 2.0 | LO Neodenticula koizumii | 52.35 (1179B); 54.05 (1179C) | 6H-3, 75–77; 6H-5, 75–77 | 2H-3, 75–77; 2H-4, 75–77 | |
Neodenticula koizumii | Koizumi (1973) | 2.8 | 2.6–2.7 | LO Neodenticula kamtschatica | 101.55 | 6H-7, 60–62; 7H-4, 75–77 | ||
N. koizumii–N. kamtschatica | Koizumi (1973) | 3.1 | 3.5–3.9 | FO Neodenticula koizumii | 109.55 | 8H-3, 75–77; 8H-4, 75–77 | ||
Neodenticula kamtschatica | Koizumi (1973) | 6.1 | 6.4 | LCO Rouxia californica | 195.05 | 16H-6, 75–77; 17H-3, 75–77 | ||
Rouxia californica |
Akiba (1986) |
191-1179B-
191-1179C-
Pseudoeunotia doliolus
Burckle (1972, 1977)
0.63
0.65
LO Nitzschia reinholdii
25.35
3H-5, 75–77; 3H-6, 75–77
Nitzschia reinholdii
Burckle (1977)
1.59
1.8
FO Pseudoeunotia doliolus
58.51
2H-7, 71–73; 3H-1, 75–77
Rhizosolenia praebergonii
Burckle (1972)
C
2.5
2.1
LO Thalassiosira convexa
92.05
5H-6, 75–77; 6H-4, 75–77
B
3.21
2.6
LO Nitzschia jouseae
112.55
7H-4, 75–77; 8H-5, 75–77
A
3
FO Rhizosolenia praebergonii‡
150.55
Nitzschia jouseae
Burckle (1972)
4.3
4.5
FO Nitzschia jouseae
12H-5, 75–77; 12H-6, 75–77
Thalassiosira convexa
Burckle (1972)
C
5.1
LO Thalassiosira miocenica
203.05
B
5.8
LO Thalassiosira praeconvexa‡
A
6.4
6.1
FO Thalassiosira convexa‡
18H-2, 75–77; 18H-3, 75–77
Nitzschia miocenica
Burckle (1972)
Notes: LO = last occurrence, FO = first occurrence. LCO = last common occurrence. * = as reported in reference cited. † = the Neodenticula seminae Zone is defined as the interval in which N. seminae is present above the LO of R. curvirostris. ‡ = marker species were not observed.