| original |
Middle Ordovician |
|
E.Germany |
Schallreuter,R. New chitinozoans from Redeposited Ordovician sediments and observations on the genus Illichitina. |
1963 |
| details |
Arenigian |
Llandeilian |
Europe |
Taugourdeau,P. Techniques of study, morphology and classification of chitinozoans. |
1966 |
| details |
Middle Ordovician |
|
Europe |
Taugourdeau,P. et al. Chitinozoans-Illustrated bibliographic analysis |
1967 |
| details |
Ordovician |
Silurian |
Baltic |
Eisenack,A. Chitinozoa of the Baltic Region. |
1968 |
| details |
Early Gothlandian |
|
Brazil(Para) |
da Costa,N.M. Silurian chitinozoa of Igarape Da Rainha, State of Para |
1971 |
| details |
Early Gothlandian |
|
Brazil(Amazonas) |
da Costa,N.M. Brazilian chitinozoans and their stratigraphic importance |
1971 |
| details |
Early Llanvirnian |
Late Llandeilian |
Europe |
Combaz,A. Stratigraphy of the chitinozoans. |
1972 |
| details |
Late Virgulian |
|
Estonia |
Nolvak,J. Biostratigraphy: Ordovician chitinozoans |
1990 |