Table T5. Neogene biostratigraphy datums used to construct an age model.
Designation
Taxon
Level (mbsf)
Age (Ma)
Source(s)
Present
Absent
Diatoms




D1 LCO Hemidiscus karstenii 8.53 4.70 0.18-0.21 Bu, ZG
D2 LCO Actinocyclus ingens 18.94 12.78 0.64-0.70 C, G, HM, GB, ZG
D3 LO Thalassiosira kolbei 58.05 57.30 1.9-2.0 G, HM, W, ZG
D4 LO Thalassiosira vulnifica 65.30 62.31 2.3-2.4 C, BB, ZG
D5 LO Thalassiosira lentiginosa var. ovalis 66.80 65.30 2.5 C, HM
D6 LO Fragilariopsis weaveri 71.30 69.80 2.8 C
D7 FO Thalassiosira vulnifica 74.04 74.70 3.2 C, W, HM
D8 FO Thalassiosira insigna 77.70 79.21 3.4 HM, ZG
D9 FO Thalassiosira lentiginosa var. ovalis 77.70 79.21 3.4 HM
D10 FO Fragilariopsis weaveri 83.35 84.10 3.4 BB, HM, ZG
D11 LO Fragilariopsis praeinterfrigidaria 87.10 85.60 3.7 HM
D12 FO Fragilariopsis interfrigidaria 96.70 98.20 3.8 G, BB, HM, ZG
D13 FO Fragilariopsis barronii 102.39 103.30 4.2-4.6 C, G, BB, HM
D14 FO Thalassiosira striata 102.39 103.30 4.5 HM
D15 FO Thalassiosira complicata 104.80 106.30 4.7 G, HM
D16 FCO Thalassiosira inura 104.80 106.30 4.9 G, HM
D17 FO Thalassiosira tetraoestrupii group 104.80 106.30 5.6-5.8 BB, HM
D18 LO Fragilariopsis donahuensis 106.30 104.80 5.8 HM
D19 LO Nitzschia miocenica 106.30 104.80 6.0-6.2 B, BB, BI
D20 LO Denticulopsis crassa 145.85 134.23 8.7 WI (CG = 7.5 Ma)
D21 FO Actinocyclus ingens var. ovalis 134.23 145.85 8.7 G, HM, CG
D22 FO Thalassiosira torokina 134.23 145.85 9.0 HM
D23 LCO Dentculopsis dimorpha var. areolata 160.60 158.27 10.7 HM
D24 LO Nitzschia denticuloides 171.70 170.20 11.7-11.8 HM, CG
D25 FO Dentculopsis dimorpha var. areolata 174.75 181.30 12.2 BB, HM
D26 LO Crucidenticula nicobarica 181.30 174.75 12.3 BB, HM
D27 LO Actinocyclus ingens var. nodus 181.30 174.75 12.5 G, HM
D28 FO Nitzschia denticuloides 186.14 191.26 13.5 G, CG
D29 FO Denticulopsis simonsenii 186.14 191.26 14.2 G, BB, HM, CG
D30 FO Actinocyclus ingens var. nodus 191.26 201.60 14.5 HM, CG
D31 FCO Actinocyclus ingens 201.60 210.85 16.2 BB, HM, CG
D32 FO Denticulopsis maccollumii 210.85 221.34 16.7 HM, CG
D33 LO Thalassiosira praefraga 230.02 221.34 18.3 HM
D34 FO Thalassiosira praefraga 248.71 261.81 20.3-20.8 HM, YA
D35 LO Rocella gelida 269.41 261.81 22.3 BB, HM
D36 LO Lisitzinia ornata (absent) — 269.41 <24.3 HM
Calcareous nannofossils


N1 LO Reticulofenestra perplexa 107.03 102.39 3.8 183 IR
N2 LO Cyclicargolithus floridanus floridanus 191.26 186.14 11.4-12.1 183 IR
N3 FO Calcidiscus leptoporus/macintyrei 221.34 230.02 17.7-18.3 183 IR
N4 LO Reticulofenestra bisecta 269.41 261.81 23.8-24.2 183 IR
N5 LO Chiasmolithus altus 278.21 269.41 25.8-26.6 183 IR
Planktonic foraminifers



P1 FO Neogloboquadrina pachyderma 118.59 126.23 9.2 183 IR
P2 FO Globorotalia miozea 191.26 201.60 16.7 183 IR
P3 FO Paragloborotalia incognita 239.85 248.71 21.6 183 IR
P4 LO Globigerina euapertura 269.41 261.81 23.8 183 IR

Notes: The age model is presented in Figure F6. All diatom ages are calibrated to the Berggren et al. (1995) timescale and are compiled from the following sources: Bu = Burckle et al. (1978), C = Ciesielski (1983), B = Baldauf (1985), G = Gersonde and Burckle (1990), BB = Baldauf and Barron (1991), HM = Harwood and Maruyama (1992), BI =Baldauf and Iwai (1995), W = Winter and Harwood (1997), GB = Gersonde and Bárcena (1998), YA = Yanagisawa and Akiba (1998), RB = Ramsay and Baldauf (1999), WI = Winter and Iwai (2002), ZG = Zielinski and Gersonde (2002), and CG = Censarek and Gersonde (2002). Planktonic foraminifer and nannofossil datums are compiled from the Leg 183 Initial Reports volume (Coffin, Frey, Wallace, et al., 2000). LO = last occurrence, LCO = last common occurrence, FO = first occurrence, and FCO = first common occurrence.