Table 6. Middle latitude radiolarian events. See table note.
|
Epoch
| Zones | Middle Latitude Radiolarian Events |
|---|---|---|
| Quaternary |
Botryostrobus aquilonaris | |
| Tm Stylacontarium acquilonium | ||
| Tm Stylatractus universus | ||
| Stylatractus universus | Tm Lamprocyrtis neoheteroporos | |
| Tm Theocorythium vetulum | ||
| Tm Eucyrtidium matuyamai | ||
| Eucyrtidium matuyamai | Tm Lamprocyrtis heteroporos | |
| Bm Lamprocyrtis nigriniae | ||
| Bm Lamprocyrtis neoheteroporos | ||
| Tm Sphaeropyle robusta | ||
| Eucyrtidium calvertense -> Eucyrtidium matuyamai | ||
| Pliocene |
Lamprocyrtis heteroporos | Tm Stichocorys peregrina |
| Sphaeropyle langii | Bm Stylacontarium acquilonium | |
| Tm Stichocorys delmontensis | ||
| Bm Lamprocyrtis heteroporos | ||
| Tm Theocorys redondoensis | ||
| Bm Sphaeropyle langii | ||
| Stichocorys peregrina | Bm Botryostrobus aquilonaris | |
| Late Miocene |
Bm Stichocorys peregrina | |
| Didymocyrtis penultima | Didymocyrtis antepenultima -> Didymocyrtis penultima |
|
| Didymocyrtis antepenultima | Didymocyrtis laticonus -> Didymocyrtis antepenultima |
|
| Diartus petterssoni | Tm Eucyrtidium inflatum Diartus petterssoni -> Diartus hughesi |
|
| Middle Miocene |
||
| Dorcadospyris alata | Dorcadospyris dentata -> Dorcadospyris alata |
|
| Early Miocene |
Calocycletta costata | Bm Calocycletta costata |
Note: Bold entries indicate zonal boundary markers.