| details |
Early Valanginian |
Middle Valanginian |
Canada(NWT,Mackenzie) |
Lentin,J.K. et al. Fossil dinoflagellates: Index to genera and species, 1981 edition. |
1981 |
| details |
Early Valanginian |
Middle Valanginian |
Nd |
Jansonius,J. The species of Fromea (fossil dinoflagellates). |
1989 |
| details |
Aalenian |
|
Canada(Alberta) |
Poulton,T.P. et al. Jurassic strata of Northwestern (and West-Central) Alberta and northeastern British Columbia |
1990 |
| details |
Valanginian |
|
Nd |
Fensome,R.A. et al. Acritarchs and Fossil Prasinophytes: An index to genera, species and infraspecific taxa. |
1990 |
| details |
Nd |
|
Nd |
Williams,G.L. et al. The Lentin and Williams Index of Fossil Dinoflagellates.1998 Edition. |
1998 |