| original |
Late Tremadocian |
Arenigian |
USSR(Yaroslav) |
Umnova,N.I. Distribution of chitinozoa in the Ordovician of the Russian Platform |
1964 |
| details |
Llanvirnian |
|
USSR |
Umnova,N.I. The use of Infrared light for the study of chitinozoa. |
1973 |
| details |
Early Ordovician |
|
USSR(Russian Platform) |
Umnova,N.I. Structural types of the Prosome and Operculum in the chitinozoa and their association with genera and species. |
1976 |
| details |
Late Tremadocian |
Arenigian |
USSR(Yaroslav) |
Locquin,M.V. Thie Chitinomycetes of chitinozoa Paleozoic fossils |
1976 |
| details |
Late Tremadocian |
Arenigian |
USSR(Yaroslav) |
Achab,A. Chitinozoa from the Lower Arenig of the Levis Formation, (Quebec, Canada). |
1980 |
| details |
Early Arenigian |
|
Canada(Quebec) |
Achab,A. Chitinozoa from the Lower Arenig of the Levis Formation, (Quebec, Canada). |
1980 |
| details |
Early Ordovician |
Middle Ordovician |
USSR(Russian Platform) |
Umnova,N.I. Ordovician and Silurian chitinozoa from the northern part of the Russian Platform. |
1981 |