original |
Late Cenomanian |
|
Nigeria |
Lawal,O. Palynological age and correlation of a Black Shale section in the Eze-Aku Formation, Lower Benue Troughk, Nigeria. |
1991 |
original |
Coniacian |
Early Santonian |
Greenland |
Nиhr-Hansen,H. Dinoflagellate cyst biostratigraphy of the Upper Cretaceous Black Mudstones on Svartenhuk Halvo, western Greenland. |
1994 |
original |
Early Maestrichtian |
|
Arctic Ocean |
Firth,J.V. et al. An Early Maestrichtian organic-walled phytoplankton cyst assemblage from an organic-rich Black Mud in core Fl-533, Alpha Ridge: Evidence for upwelling conditions in the Cretaceous Arctic Ocean |
1998 |