original |
Early Valanginian |
|
England |
Davey,R.J. Dinocysts stratigraphy of the latest Jurassic to Early Cretaceous of the Haldager No.1 borehole, Denmark. |
1982 |
original |
Ryazanian |
Early Valanginian |
North Sea |
Heilmann-Clausen,C. Lower Cretaceous dinoflagellate biostratigraphy in the Danish Central Trough |
1987 |
original |
Early Valanginian |
|
North Sea |
Crittenden,S. et al. The Early - Middle Cretaceous lithostratigraphy of the Central North Sea, (United Kingdom Sector). |
1991 |
original |
Early Valanginian |
|
North Sea |
Wilkinson,I.P. et al. Appendix: Cretaceous biostratigraphic biomarkers. (In: Cretaceous of the Central northern North Sea. H.Johnson and G.K.Lott, editors) |
1993 |
original |
Late Valanginian |
|
Spain |
Leereveld,H. Upper Tithonian - Valanginian (Upper Jurassic - Lower Cretaceous) dinoflagellate cyst stratigraphy of the western Mediterranean. |
1997 |