| details |
Early Ashgillian |
Late Caradocian |
Canada(Anticosti Island) |
Achab,A. Chitinozoa from the Dicellograptus complanatus zone, Vaureal Formation (Upper Ordovician) Ile d'Anticosti, Quebec. |
1977 |
| details |
Ashgillian |
|
Canada(Anticosti Island) |
Achab,A. Chitinozoa from the Climacograptus prominens elongatus zone, Vaureal Formation (Upper Ordovician) Ile d'Anticosti,Quebec. |
1977 |
| details |
Late Ordovician |
|
Canada(Anticosti Island) |
Achab,A. Upper Ordovician chitinozoa: Vaureal and Ellis Bay Formations - Anticosti Island, Quebec. |
1978 |
| original |
Early Ordovician |
Middle Ordovician |
USSR(Russian Platform) |
Umnova,N.I. Ordovician and Silurian chitinozoa from the northern part of the Russian Platform. |
1981 |
| original |
Middle Ordovician |
Early Ordovician |
USSR(Russian Platform) |
Umnova,N.I. Ordovician and Silurian chitinozoa from the northern part of the Russian Platform. |
1981 |
| details |
Devonian |
|
Brazil(Para) |
da Costa,N.M. Small chitinozoa of the Mapuera River, State of Para. |
1982 |
| details |
Devonian |
Devonian |
Brazil(Para) |
da Costa,N.M. Small chitinozoa of the Mapuera River, State of Para. |
1982 |
| details |
Early Ashgillian |
|
Canada(Quebec) |
Achab,A. Ordovician chitinozoan zonation of Quebec and Western Newfoundland. |
1989 |
| details |
Early Caradocian |
|
Canada(Ontario) |
Grahn,Y. et al. Microfossil dating of the Bront Meteorite Crater, Southeast Ontario, Canada |
1995 |