Table T6. Diatom datums, Leg 202.
Zonal boundary*
Event
CK95 GPTS
age (Ma)
Chron
Reference
P. doliolus/N. reinholdii LO Nitzschia reinholdii 0.62 C1n Shackleton et al., 1995
A/B of N. reinholdii LO Rhizosolenia praebergonii v. robusta 1.73 C1r Shackleton et al., 1995
N. reinholdii/N. marina FO Fragilariopsis doliolus 2.00 C2r.1r Shackleton et al., 1995
A/B of N. marina LO Thalassiosira convexa s.l. 2.41 C2n Shackleton et al., 1995
N. marina/N. jouseae LO Nitzschia jouseae 2.77 C2An.1n Shackleton et al., 1995
N. jouseae/T. convexa FO Nitzschia jouseae 5.12 C3n.4n Shackleton et al., 1995
B/C of T. convexa LO Thalassiosira miocenica 5.84
Shackleton et al., 1995
A/B of T. convexa LO Thalassiosira praeconvexa 6.18 C3An.2n Shackleton et al., 1995
T. convexa/N. miocenica FO Thalassiosira convexa v. aspinosa 6.57 C3An.2n Shackleton et al., 1995
A/B of N. miocenica FO Thalassiosira praeconvexa 6.71 C3An.2n Shackleton et al., 1995
N. miocenica/N. porteri FO Nitzschia miocenica s.l. 7.30
Shackleton et al., 1995
A/B of N. porteri LO Thalassiosira burckliana 7.85 C4n.2n Shackleton et al., 1995
N. porteri/T. yabei LO Thalassiosira yabei 8.23 C4r.1n Shackleton et al., 1995
A/B of T. yabei FO Thalassiosira burckliana 8.91 C4An Shackleton et al., 1995
T. yabei/A. moronensis LO Actinocyclus moronensis 9.76
Shackleton et al., 1995
A. moronensis/C. coscinodiscus LO Craspedodiscus coscinodiscus 11.44
Shackleton et al., 1995
C. coscinodiscus/C. gigas v. diorama LO Actinocyclus ingens 12.18
Shackleton et al., 1995
C. gigas v. diorama/C. lewisianus LO Coscinodiscus lewisianus 12.93
Shackleton et al., 1995
C. lewisianus/C. peplum LO Cestodiscus peplum 14.06 C5ACn Shackleton et al., 1995
A/B of C. peplum LO Annellus californicus 14.99
Shackleton et al., 1995
C. peplum/C. nicobarica FO Cestodiscus peplum 16.37 C5Cn.1n Shackleton et al., 1995
A/B of C. nicobarica LO Thalassiosira burkryi 16.74 C5Cr Barron,1985; Barron, 1992
C. nicobarica/T. pileus FO Crucidenticula nicobarica s.l. 17.77
Shackleton et al., 1995
T. pileus/C. elegans LO Craspedodiscus elegans 18.41
Barron,1985; Barron, 1992
C. elegans/R. paleacea LO Bogorovia veniamini 19.59
Barron,1985; Barron, 1992
B/C of R. paleacea LO Azpeitia oligocenica 20.27
Barron,1985; Barron, 1992
A/B of R. paleacea LO Thalassiosira primalabiata 21.31
Barron,1985; Barron, 1992
R. paleacea/R. gelida FO Rossiella paleacea 22.64
Barron,1985; Barron, 1992
R. gelida/B. veniamini FO Rocella gelida 24.26
Barron,1985
B. veniamini /R. vigilans FO Bogorovia veniamini 25.60
Barron,1985
A/B of R. vigilans LO Cestodiscus mukhinae 27.34
Barron,1985
R. vigilans/C. excavatus LO Coscinodiscus excavatus 31.91
Barron,1985
bottom of C. excavatus Zone FO Coscinodiscus excavatus 34.04
Barron,1985

Notes: * = zonal schemes are based on those of Barron (1985a, 1985b) with modification of Baldauf and Iwai (1995). Bold type = major zonal limits. FO= first occurrence, LO = last occurrence. One exception is the zonal boundary datum of Craspedodiscus coscinodiscus/Coscinodiscus gigas v. diorama zones. We substituted the last common occurrence of Actinocyclus ingens for the FO of Coscinodiscus temperei v. delicata because the species is rare and sporadic. Age values were updated from the literature (Barron, 1985a, 1992; Shackleton et al., 1995) and given in the geomagnetic polarity timescale (GPTS) of Cande and Kent (1995).