Table T1. Oligocene to Pleistocene diatom zonal ages for the Southern Ocean zonation of Harwood and Maruyama (1992).
|
Datum
|
Taxon
|
Revised age
(Ma) |
|---|---|---|
| LO | Actinocyclus ingens | 0.66 |
| LO | Fragilariopsis barronii | 1.35 |
| LO | Thalassiosira kolbei | 1.9 |
| LO | Thalassiosira vulnifica | 2.3 |
| LO | Thalassiosira insigna | 2.6 |
| LO | Fragilariopsis weaveri | 2.8 |
| FO | Thalassiosira vulnifica | 3.2 |
| FO | Fragilariopsis interfrigidaria | 3.8 |
| LO | Rhizosolenia costata | 4.2 |
| FO | Fragilariopsis barronii | 4.6 |
| FCO | Thalassiosira inura | 4.9 |
| FO | Thalassiosira oestrupii | 5.6-5.8 |
| FO | Thalassiosira oliverana | 6.4 |
| FO | Hemidiscus ovalis | 8.7 |
| FO | Thalassiosira torokina | 9.0 |
| FO | Asteromphalus kennettii | 10.3 |
| LCO | Denticulopsis dimorpha | 10.7 |
| LO | Nitzschia denticuloides | 11.7 |
| FO | Denticulopsis dimorpha | 12.2 |
| FO | Denticulopsis praedimorpha | 12.8 |
| FO | Nitzschia denticuloides | 13.5 |
| FO | Denticulopsis simonsenii | 14.2 |
| FO | Actinocyclus ingens var. nodus | 14.5 |
| FO | Nitzschia grossepunctata | 15.4 |
| FCO | Actinocyclus ingens | 16.2 |
| FO | "Denticulopsis" maccollumii | 16.7 |
| FO | Crucidenticula kanayae | 17.7 |
| LO | Thalassiosira praefraga | 18.3 |
| LO | Rossiella symmetrica | 19.4 |
| FO | Thalassiosira praefraga | 20.8 |
| LO | Azpeitia gombosi | 21.1 |
| FO | Thalassiosira spumellaroides | 22.6 |
| LO | Lisitzinia ornata | 24.3 |
| LO | Rocella vigilans var. B | 25.4 |
| FO | Rocella gelida | 26.4 |
| FO | Lisitzinia ornata | 28.0 |
| FO | Azpeitia gombosi | 28.3 |
| LO | Rocella vigilans var. A | 28.9 |
| FO | Rocella vigilans var. A | 30.2 |
| FO | Cavitatus jouseanus | 30.6 |
| FO | Rhizosolenia oligocaenica | 33.2 |
Notes: All ages are revised to the Berggren et al. (1995b) time scale. LO = last occurrence, FO = first occurrence, FCO = first common occurrence, LCO = last common occurrence.