|
Event
|
Species
|
Age
(Ma) |
Zone
(base) |
Reference
|
|---|---|---|---|---|
| FO | Buccinosphaera invaginata | — | Buccinosphaera invaginata | 1 |
| LO | Axoprunum angelinum | 0.46 | NR1 | 2 |
| LO | Axoprunum angelinum | 0.46 | Collosphaera tuberosa | 1 |
| FO | Collosphaera tuberosa | 0.61 | Axoprunum angelinum | 1 |
| LO | Lamprocyrtis neoheteroporos | 1.07 |
|
1 |
| LO | Anthocyrtidium angulare | 1.17 | Amphirhopalum ypsilon | 1 |
| LO | Cycladophora pliocenica | 1.83 | NR3/4 | 2 |
| LO | Pterocanium prismatium | 1.76 | Anthocyrtidium angulare | 1 |
| FO | Cycladophora davisiana | 2.7 |
|
2 |
| LO | Stichocorys peregrina | 2.7 | Pterocanium prismatium | 1 |
| LO | Phormostichoartus doliolum | 4.0 | Anthocyrtidium jenghisi | 1 |
| LO | Didymocyrtis penultima | 4.6 | Phormostichoartus doliolum | 1 |
| FO | Spongurus pylomaticus | 5.2 | Spongurus pylomaticus | 3 |
|
|
Stichocorys delmontensis→tichocorys peregrina | 6.9 | Stichocorys peregrina | 1 |
| LO | Diartus hughesi | 7.8 | Didymocyrtis penultima | 1 |
|
|
Diartus petterssoni→iartus hughesi | 8.8 | Didymocyrtis antepenultima | 1 |
| FO | Diartus petterssoni | 12.6 | Diartus petterssoni | 1 |
|
|
Dorcadospyris dentata→Dorcadospyris alata | 15.6 | Dorcadospyris alata | 1 |
Notes: FO = first occurrence; LO = last occurrence; and — = evolutionary transition sensu Riedel and Sanfilippo (1971). Age and zonal references are (1) Moore (1995); (2) Caulet (1991); and (3) Motoyama (1996). Numerical ages are from Moore (1995); Caulet (1991); and Motoyama (1996) and are adjusted here to the geomagnetic-polarity time scale of Berggren et al. (1995b).