original |
Late Cenomanian |
Early Campanian |
Canada(NWT,Franklin) |
Felix,C.J. et al. Age of microplankton studied by Manum and Cookson from Graham and Ellef Ringes Islands. |
1976 |
original |
Campanian |
|
Canada(Saskatchewan) |
Harker,S.D. Campanian organic-walled microplankton from the Interior Plains of Canada, Wyoming and Texas. |
1977 |
original |
Campanian |
|
Canada(Manitoba) |
Harker,S.D. Campanian organic-walled microplankton from the Interior Plains of Canada, Wyoming and Texas. |
1977 |
original |
Campanian |
|
Texas |
Harker,S.D. Campanian organic-walled microplankton from the Interior Plains of Canada, Wyoming and Texas. |
1977 |
original |
Campanian |
|
Wyoming |
Harker,S.D. Campanian organic-walled microplankton from the Interior Plains of Canada, Wyoming and Texas. |
1977 |