| original |
Arenigian |
Middle Ordovician |
USSR(Yaroslav) |
Umnova,N.I. Distribution of chitinozoa in the Ordovician of the Russian Platform |
1964 |
| details |
Caradocian |
Ashgillian |
Romania |
Beju,D. Zoning and correlation of the Paleozoic of the Moesian Platform on the basis of palynoprotistological assemblages.1. |
1972 |
| details |
Llanvirnian |
|
USSR |
Umnova,N.I. The use of Infrared light for the study of chitinozoa. |
1973 |
| details |
Arenigian |
Middle Ordovician |
USSR(Yaroslav) |
Locquin,M.V. Thie Chitinomycetes of chitinozoa Paleozoic fossils |
1976 |
| details |
Arenigian |
|
Czechoslovakia |
Paris,F. et al. Arenigian chitinozoans from the Klabava Formation, Bohemia. |
1984 |
| details |
Middle Arenigian |
|
Canada(Quebec) |
Achab,A. Chitinozoa assemblages of the Early Ordovician of eastern Canada. |
1986 |
| details |
Nd |
|
Nd |
Grahn,Y. Ordovician chitinozoa and biostratigraphy of Brazil |
1992 |
| details |
Tremadocian |
Arenigian |
USSR(Baltic) |
Wrona,R.M. et al. Structure of Lagenochitina (Chitinozoa) from Baltic Region and chitinozoan biostratigraphy |
1993 |