| details |
Late Ashgillian |
|
Canada(Quebec) |
Achab,A. Ordovician chitinozoan zonation of Quebec and Western Newfoundland. |
1989 |
| details |
Late Ashgillian |
|
Canada(Newfoundland) |
Achab,A. Ordovician chitinozoan zonation of Quebec and Western Newfoundland. |
1989 |
| details |
Middle Ashgillian |
|
Canada(Anticosti Island) |
Petryk,A. Lithostratigraphic, paleogeographic and hydrocarbon potential of Anticosti Island. |
1981 |
| details |
Late Ordovician |
|
Canada(Anticosti Island) |
Achab,A. Upper Ordovician chitinozoa: Vaureal and Ellis Bay Formations - Anticosti Island, Quebec. |
1978 |
| original |
Ashgillian |
|
Canada(Anticosti Island) |
Achab,A. Chitinozoa from the Climacograptus prominens elongatus zone, Vaureal Formation (Upper Ordovician) Ile d'Anticosti,Quebec. |
1977 |