| original |
Ryazanian |
|
USSR(Ryazin) |
Iosifova,E.K. Dinocysts from Tchernaya Retchka (Ryazanian-Aptian, Lower Cretaceous) of the Moscow Basin, Russia |
1996 |
| original |
Middle Volgian |
|
North Sea |
Heilmann-Clausen,C. Lower Cretaceous dinoflagellate biostratigraphy in the Danish Central Trough |
1987 |
| original |
Portlandian |
|
Denmark |
Davey,R.J. Dinocysts stratigraphy of the latest Jurassic to Early Cretaceous of the Haldager No.1 borehole, Denmark. |
1982 |
| original |
Early Portlandian |
|
Denmark |
Jan du ChЄne,R.E. et al. Practical guide for the identification of dinoflagellate cyst fossils. the Gonyaulacysta complex. |
1986 |