| original |
Early Valanginian |
Middle Valanginian |
Canada(NWT,Mackenzie) |
McIntyre,D.J. et al. Valanginian miospore and microplankton assemblages from the northern Richardson Mountains, District of MacKenzie, Canada. |
1980 |
| details |
Early Valanginian |
Middle Valanginian |
Canada(NWT,Mackenzie) |
Helenes,J. Morphological analysis of Mesozoic - Cenozoic Cribroperidinium (Dinophyceae), and taxonomic implications. |
1984 |
| details |
Nd |
|
Nd |
Williams,G.L. et al. The Lentin and Williams Index of Fossil Dinoflagellates.1998 Edition. |
1998 |