Table T3. Applied Neogene diatom zonations.
Yanagisawa and Akiba, 1998 (Northwest Pacific)
Diatom zone
Author
Subzone
Leg 191 boundary age (Ma)
Yanagisawa and Akiba (1998) boundary age (Ma)*
Datum boundary
Depth (mbsf)

Core, section, interval (cm)

              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)

             

Barron, Leg 85 (Equatorial Pacific)
Diatom zone
Author
Subzone
Leg 191 boundary age (Ma)
Barron (1985a) boundary age (Ma)*
Datum boundary
Depth (mbsf)
Core, section, interval (cm)







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.