Table T3. Applied Neogene diatom zonations.

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)

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.